How Much Does Monolithic NAND Recovery Cost?
Monolithic NAND recovery costs $1,200–$1,500, with a 50% deposit required before work begins. Every case starts with a free evaluation and a firm quote. If the raw NAND data cannot be reconstructed, no recovery fee is charged.
| Service Tier | Price | ETA |
|---|---|---|
| Simple Copy (device functional) | $200 | 3-5 business days |
| File System Recovery | $300–$600 | 2-4 weeks |
| PCB Repair (shorted components) | $600–$900 | 3-6 weeks |
| Chip-Off / Monolithic NAND Extraction | $1,200–$1,500 | 4-8 weeks |
Rush service available: +$100 rush fee to move to the front of the queue. All prices + tax. No data, no recovery fee.
What Devices Use Monolithic NAND?
Monolithic NAND packages are used in compact storage devices where space is too limited for separate controller & memory chips. The smaller the device, the more likely it uses a monolithic design.
- USB Flash Drives (under 64GB)
- Most compact USB sticks use a single monolithic chip that combines the USB interface controller, wear-leveling logic, & NAND flash on one die. When the controller portion fails, the entire device disappears from the OS. There is no separate chip to bypass.
- MicroSD & SD Cards
- MicroSD cards are monolithic by necessity. The 11mm x 15mm form factor leaves no room for discrete components. The SD controller, NAND, & interface logic all occupy a single die inside the plastic housing.
- eMMC Modules
- Embedded MultiMediaCard modules in tablets, budget laptops, & IoT devices use a BGA package containing the controller & NAND together. These are soldered directly to the device motherboard. Recovery requires desoldering the eMMC package first, then reading its NAND contents.
- Compact M.2 2230 Modules
- Some compact M.2 2230 NVMe drives (used in Steam Deck, Microsoft Surface, & ultrabooks) use tightly integrated packages where the controller & a single NAND die share a BGA footprint. Standard NVMe tools may fail if the controller is dead; physical access to the NAND die becomes necessary.
How Does Monolithic NAND Recovery Work?
Monolithic NAND recovery bypasses the dead controller by reading flash memory directly from the silicon die. The process requires physical access to the chip's internal data lines, followed by software reconstruction of the raw data into readable files.
- Free evaluation. We examine the device, identify the monolithic chip package, & determine whether the NAND is accessible. You get a firm quote before any paid work starts.
- Pinout identification. The technician identifies which pads on the monolithic package connect to the NAND data lines, control lines, & power rails. This varies by manufacturer & model.
- Physical connection. Fine-gauge wires are bonded to the identified pads, or a custom adapter is fitted to the chip's BGA balls. This connects the raw NAND to our reading equipment.
- Raw NAND dump. A dedicated NAND reader pulls a complete dump of every page & block in the NAND. This data is scrambled & encoded; it isn't a file system yet.
- Data reconstruction. XOR descrambling removes the hardware scrambling layer. ECC algorithms correct bit errors. The Flash Translation Layer mapping is rebuilt to convert physical NAND addresses into logical sectors.
- File extraction & delivery. The reconstructed data is mounted as a file system & verified against expected directory structures. Files are delivered on your choice of return media.
Why Do Standard Recovery Tools Fail on Monolithic NAND?
Recovery software (Disk Drill, R-Studio, PhotoRec, EaseUS) requires a functioning storage interface. The software sends ATA, NVMe, or SCSI commands through the operating system's block device layer. A monolithic NAND device with a dead controller presents no block device. The OS doesn't enumerate it. There is nothing for the software to talk to.
Even hardware-based recovery platforms like the PC-3000 Express (SATA/PATA) or PC-3000 Portable III (NVMe) operate through standard storage protocols. The PC-3000 SSD utility communicates with SSD controllers in technological/diagnostic mode, but this still requires a responding controller. A monolithic device with a dead controller doesn't respond in any mode.
The only path is to bypass the controller entirely & access the NAND flash memory at the physical level. This means identifying the data I/O pins on the monolithic package, establishing electrical contact with them, and reading raw NAND pages directly. A dedicated NAND reader connects to the flash through these physical test points, treating the memory as a standalone chip rather than part of an integrated device.
How Is Monolithic NAND Pinout Identification Performed?
Pinout identification is the process of mapping which physical pads on a monolithic package connect to NAND data lines (I/O0 through I/O7), control signals (CE#, RE#, WE#, ALE, CLE, WP#), and power rails (VCC, VSS). Without this map, there is no way to issue read commands to the NAND die.
Monolithic packages come in several physical formats, each requiring a different access method:
- TSOP-48 Exposed Pads
- Older monolithic USB drives expose TSOP-48 pinout pads on the package exterior. These can be clipped or soldered to directly. The pin mapping follows ONFI or JEDEC standards for the NAND manufacturer (Toshiba/Kioxia, Samsung, Micron, Hynix), but the controller vendor may remap pins for their specific design.
- BGA Packages
- Modern monolithic devices use Ball Grid Array packaging where solder balls on the bottom of the chip connect to the PCB. Accessing NAND data lines requires either (a) desoldering the package & probing the exposed balls directly, or (b) identifying test pads that the manufacturer left accessible on the PCB for factory testing. A Zhuo Mao BGA rework station handles the desoldering with controlled thermal profiles.
- COB (Chip on Board)
- Budget USB drives & some SD cards use chip-on-board construction: the bare silicon die is bonded directly to the PCB with gold wire bonds, then covered in epoxy. The epoxy must be chemically or mechanically removed to expose the wire bond pads. This is the most labor-intensive access method & carries higher risk of damage to the bond wires.
COB Decapsulation Process
Decapsulation removes the protective epoxy compound covering the bare silicon die without destroying the NAND cells or wire bond connections underneath. The technique varies by epoxy chemistry. Phenolic-based epoxy packages dissolve in heated acid baths at 75-100°C; anhydride-based formulations require higher temperatures in the 140-290°C range with different chemical compositions.
Copper wire bonds add a constraint. Older monolithic devices used gold wire bonds, which resist common decapsulation acids. Modern manufacturers switched to copper for cost savings, and copper reacts with standard acid formulations.
Mixed-acid baths at controlled temperatures dissolve the epoxy while leaving copper bonds intact. Temperature control within a 5°C window is the difference between exposed test pads & a destroyed die.
After decapsulation, the exposed NAND test pads are visible under a stereo microscope at 20-40x magnification. These pads are the starting point for pinout identification. A typical COB monolithic die exposes 20-30 pads; not all carry NAND signals. Some are factory test points, oscillator inputs, or unused bond locations that the controller never routes.
Logic Analyzer Pinout Discovery
When datasheets for a monolithic controller don't exist, a logic analyzer reverse-engineers the pinout by capturing NAND bus traffic during the device's initialization sequence. The technician connects analyzer channels (16+ channels at 100MHz+ sample rate) to unknown test pads on the monolithic package, then powers the device through its standard USB or SD interface to trigger the controller's boot sequence.
Each NAND signal has a distinct electrical signature during initialization. Identifying them requires reading the timing relationships between pad activity & correlating those patterns against the ONFI specification for raw NAND command sequences.
- RE# (Read Enable)
- Dense, continuous clock-like pulse trains during read operations. RE# is the easiest signal to locate because reads involve the largest data transfers during init. The pulse frequency corresponds to the NAND bus clock speed.
- WE# (Write Enable)
- Short, infrequent pulse trains. The controller writes far less data than it reads during initialization. WE# pulses appear in brief clusters separated by long idle periods.
- CE# (Chip Enable)
- Drops low when the NAND core is being addressed. Each command sequence starts with CE# falling to zero. On multi-die monolithic packages, multiple CE# lines exist; one per internal NAND die.
- CLE (Command Latch Enable)
- Goes high when the data bus carries command bytes. Common commands visible during init: 0xFF (Reset), 0x90 (Read ID), 0x00/0x30 (Read Page). The presence of these hex values on the data lines while CLE is high confirms the signal assignment.
- ALE (Address Latch Enable)
- Goes high when the data bus carries physical NAND addresses. ALE pulses follow CLE pulses in a fixed sequence: command byte first, then 2-5 address cycles depending on NAND capacity.
- D0-D7 (Data Bus)
- Eight I/O lines carrying commands, addresses, & data. These pads change state in coordination with WE# & RE# pulses. The Read ID command (0x90 on the data bus with CLE high) returns the NAND manufacturer's chip ID bytes, which confirms D0-D7 assignment.
- R/B# (Ready/Busy)
- Drops low while the NAND executes an internal operation (page read, page program, block erase). Returns high when the operation finishes. R/B# transitions last microseconds to milliseconds depending on the operation type.
Once all 16+ pins are mapped, the dead controller is bypassed entirely. The identified NAND lines are wired to a dedicated NAND reader, which communicates with the raw NAND using standard ONFI commands. The logic analysis phase takes 2-6 hours per device for an undocumented controller; documented pinouts from known databases skip this step.
Spiderwebbing and Spider Board Adapters
Spiderwebbing is the microsoldering technique where 40 AWG (0.08mm diameter) enameled copper magnet wire is soldered to each identified test pad on the monolithic die. Working under a stereo microscope at 20-40x magnification, the technician tins each pad with a Hakko FM-2032 iron at 280-300°C, then bonds individual wires from each pad to a breakout board or NAND reader adapter. A single monolithic device requires 20-28 individual wire bonds.
Pad pitch on modern monolithic dies is under 0.3mm. Adjacent pads sit close enough that a single solder bridge shorts two connections & corrupts every read. Excessive iron dwell time pushes heat through the silicon substrate into the NAND cells below; 3 seconds of contact at the wrong temperature can shift charge thresholds in TLC cells. A lifted pad is permanent: the copper trace separates from the silicon die & can't be rebonded.
The ACELab PC-3000 Flash Spider Board offers a non-soldering alternative. It uses adjustable needle probes that press against NAND test pads without applying heat or solder. Each needle is positioned under a stereo microscope & locked with a set screw. Setup takes roughly 30 minutes per device, but eliminates the thermal & mechanical risk of wire bonding.
Spider Board needle probes have higher contact resistance than soldered wires. On power-heavy NAND read operations, VCC & GND lines need lower resistance than a single needle provides. To reduce resistance, technicians either assign multiple needles to the same VCC and GND pads, or solder a dedicated power wire directly from the adapter's fixed screw terminals. Software-controlled voltage output ranges from 1.8V to 3.6V. Fine-grained VCC control matters because modern TLC & QLC NAND often requires non-standard voltage to stabilize read operations on degraded cells.
Before reading begins, PC-3000 Flash runs a pre-read diagnostic that checks needle assignments for pin duplications & short circuits. A short between adjacent data lines (D0-D7) corrupts every read; catching it before the dump prevents wasted time & unnecessary stress on degraded NAND.
Once pinouts are identified, fine-gauge wires (typically 30-40 AWG) are bonded to each pad using a Hakko FM-2032 microsoldering iron. The wires connect to a NAND reader adapter. Thermal management is critical during soldering: the monolithic die contains both the controller & NAND on one substrate, and excessive heat can damage the NAND cells we're trying to read.
Pinout Validation via Read ID Command
After connecting wires or Spider Board needles, the technician validates the pinout before attempting a full NAND dump. The ONFI Read ID command (0x90) is the standard validation tool. PC-3000 Flash asserts CE# low, pulses WE# with 0x90 on the data bus while CLE is high, then sends address 0x00 with ALE high. Pulsing RE# clocks out the NAND's manufacturer ID & device ID bytes.
A correct response returns the JEDEC manufacturer code: 0x98 for Toshiba/Kioxia, 0x2C for Micron, 0xEC for Samsung, 0xAD for SK Hynix. The device ID bytes that follow identify the exact NAND model, page size, block size, & number of planes. If the response is 0xFF or garbage data, at least one pin assignment is wrong. The technician repositions Spider Board needles or re-examines wire bonds & retests until a valid manufacturer ID returns.
Protocol Decode and Timing Analysis
Protocol decode converts raw logic analyzer captures into structured ONFI command sequences, showing each Read ID, Page Read, & Status Check as labeled transactions rather than voltage transitions. This requires a minimum 100MHz sample rate, 10x the NAND bus clock, so the analyzer captures enough edge resolution to distinguish valid transitions from noise.
Raw pulse capture tells you which pad toggled. Protocol decode tells you what the controller asked the NAND to do. The difference matters when the pinout has ambiguous signals: two pads with similar pulse patterns resolve into distinct functions once the analyzer parses them as CLE vs. ALE within a complete command frame.
Dead Controller Pinout Transfer via Donor Capture
A dead monolithic controller produces no bus traffic, which means there are no signals to capture & no pinout to discover. The workaround: acquire a functionally identical donor device with the same controller & NAND package. The technician sands down the donor's epoxy coating, exposes its test pads, & connects 16+ logic analyzer channels to every candidate pad. Powering the donor through USB triggers a normal boot sequence, and the analyzer captures the full initialization protocol.
Both devices share the same die layout because they come from the same silicon mask. The pad that carries RE# on the donor carries RE# on the dead device. The captured pinout map transfers directly. Donor sourcing adds time to the recovery, but it's the only option when the controller won't generate signals on its own.
Timing Gaps Between Signal Transitions
CE# falling edge starts every command sequence. WE# rising edges latch commands & addresses onto the data bus. RE# falling edges clock data bytes out. The timing gaps between these transitions confirm signal identity when visual waveform inspection is ambiguous.
ONFI specifies minimum setup & hold times for each signal pair. ALE must stabilize at least 5ns before WE# rises; if the measured gap between a suspected ALE pad & the confirmed WE# pad violates this 5ns minimum, the pad assignment is wrong. The technician reassigns & recaptures until all timing constraints pass. A single misassigned control line produces a dump full of bit-shifted garbage that looks like corrupted data but is an artifact of wrong pinout, not damaged NAND.
Multi-Die CE# Discovery on High-Capacity Devices
Monolithic packages at 128GB & above stack multiple NAND dies in one BGA footprint. Each die has its own CE# line: CE0, CE1, CE2, sometimes CE3. During initialization, the controller pulls each CE# low in sequence to issue Read ID to every die. The logic analyzer captures these sequential CE# assertions as separate falling-edge events separated by microseconds.
The temporal order of CE# assertions reveals the controller's interleave sequence. Die 0 (CE0) might be read first for even LBAs, Die 1 (CE1) for odd LBAs. Getting this order wrong during FTL reconstruction scrambles the logical address space; file system structures land at wrong offsets & the data looks corrupted even though every byte was read correctly. PC-3000 Flash's interleave node requires the exact CE# order, which the technician sets based on the captured boot sequence.
How Is Raw NAND Data Reconstructed?
A raw NAND dump is not usable data. The controller applies multiple transformation layers between the file system and the physical NAND pages. Reconstructing usable files requires reversing each layer in sequence.
XOR Descrambling
Most NAND controllers apply an XOR scrambling pattern to data before writing it to flash. This spreads the bit distribution evenly across cells, preventing patterns of all-zeros or all-ones that degrade NAND reliability. The scrambling key is unique to the controller model (not the individual device). NAND recovery tools maintain databases of known XOR keys for common controller families. For undocumented controllers, the key must be derived through pattern analysis of known data structures in the dump.
Static vs. Dynamic XOR Keys
Static XOR uses a fixed scrambling pattern identical for every NAND page. Older controllers (some Alcor AU6989, Phison PS2251-07 variants) apply the same key regardless of physical address. NAND recovery tools maintain databases of known static keys indexed by controller model. The technician identifies the controller, looks up the key, & applies it across the entire dump in a single pass.
Dynamic XOR is different. The scrambling key changes based on the physical page number, block address, or an internal algorithm. A dynamic key can't be retrieved from a static database because it varies per page. Modern controllers from Silicon Motion, Phison, & Maxio use dynamic XOR. Recovering the key requires extraction from the raw dump itself.
Dynamic XOR Key Extraction
Dynamic key extraction relies on a Boolean identity: A XOR 0 = A. If a NAND page was written with all-zero user data, the raw stored content IS the XOR key for that page. In FAT & NTFS file systems, Logical Block Number 0001 (the region between the MBR at LBN 0000 & the boot record) is filled with binary zeroes. The physical NAND block that maps to LBN 0001 contains the pure scrambling pattern.
The extracted key contains bit errors from cell degradation & interleaved ECC parity bytes. A bit verification utility in the NAND reader software corrects these errors. The technician locates three or more separate blocks known to contain scrambled zeroes (empty regions near the end of the partition are a common source), feeds them into the verification tool, & the software performs a bitwise majority vote across all samples. Random bit flips cancel out; the surviving pattern is a clean dynamic XOR key.
On fully written drives where zero-filled blocks don't exist, a donor device with the same controller provides the reference data. Known patterns are written to the donor's NAND, the donor is dumped, & mathematical diffing between the known input & scrambled output isolates the XOR algorithm parameters. This adds 4-8 weeks to the timeline because it requires sourcing & preparing the donor device.
XOR Decode Validation Workflow
Applying the wrong XOR key produces output that looks like valid data at first glance but fails at the file system level. Validation must happen before the technician commits hours to FTL reconstruction on a bad decode. Two checks run in sequence: visual bitmap inspection & file system signature scanning.
PC-3000 Flash renders the descrambled dump as a 2D bitmap where each pixel represents one byte. Correct descrambling produces recognizable visual patterns that vary by controller family. Alcor & ITE controllers generate diagonal stripe patterns across the bitmap. Silicon Motion controllers produce vertical stripe patterns. If the bitmap still shows random noise after key application, the key is wrong or the XOR mode (static vs. dynamic) was misidentified.
File system signature scanning confirms the bitmap result. The technician searches the descrambled output for known hex signatures at expected logical offsets: 55 AA at the end of an MBR sector, EB 58 90 for exFAT boot sectors, EB 52 90 for NTFS, JPEG headers (FF D8 FF E0), or PNG headers (89 50 4E 47). Intact signatures at correct LBA offsets confirm the key is right. Scattered signatures at random offsets mean the XOR is partially correct but the interleave order is wrong.
Phison Dynamic XOR: Virtual Block Size
Phison dynamic XOR requires determining the virtual block size before key calculation. Modern Phison controllers write simultaneously across 2 or 4 internal planes for throughput. A virtual block spans all physical blocks across active planes sharing the same logical block number. The dynamic key calculation uses the virtual block address as an input parameter.
The bitmap viewer exposes the virtual block boundary. Repeating visual patterns appear at fixed intervals across the descrambled dump; the interval length in bytes equals the virtual block size. Wrong virtual block size shifts the dynamic key calculation out of phase after the first block, producing clean data for the initial pages & garbage for everything after. The technician adjusts the virtual block parameter in the Transformation Graph until the bitmap pattern repeats consistently across the entire dump.
Two-Layer Dynamic XOR Stripping
Phison's dynamic XOR combines two layers: a base static key & a block-address-dependent dynamic key. Stripping order matters. The dynamic layer must come off first using the virtual block size & address-dependent calculation. Then the static key is extracted from known-zero blocks (the same Boolean identity: A XOR 0 = A) & applied as a second pass.
Reversing the order corrupts the output. Applying the static key first leaves the dynamic component intact, and the subsequent dynamic stripping operates on already-modified data, compounding errors across every page. PC-3000 Flash's Transformation Graph enforces the correct sequence by placing the dynamic node before the static node in the processing chain. The technician verifies each layer independently: bitmap check after dynamic stripping, then bitmap check again after static stripping.
ECC Correction
NAND flash cells degrade with each program/erase cycle. The controller uses Error Correction Codes (BCH or LDPC, depending on the NAND generation) to detect & correct bit errors on read. When reading raw NAND without the controller, the ECC must be applied in software. Modern 3D TLC & QLC NAND requires LDPC codes that correct dozens of bit errors per 1KB ECC sector. Without correct ECC parameters (code length, generator polynomial, interleaving depth), the data remains corrupted.
Software ECC Bypass on Dead Controllers
A dead monolithic controller takes its hardware ECC engine with it. Raw NAND reads without ECC correction return data riddled with bit errors: flipped bits scattered across every page, accumulating with each program/erase cycle the NAND endured during its lifetime. PC-3000 Flash applies ECC entirely in software, but the correction method depends on whether the NAND uses BCH or LDPC encoding.
BCH Correction on Older SLC & MLC Monolithic NAND
BCH is a hard-decision code. The NAND cell is read once at a single voltage threshold: the bit is either 0 or 1, with no in-between. Parity bytes stored in the spare area (OOB region) of each page provide the correction data. BCH can correct a fixed number of bit errors per ECC sector, typically 4-40 bits per 512-byte or 1KB sector depending on the code strength configured by the controller manufacturer.
For SLC monolithic NAND (1 bit per cell, 2 voltage states), BCH handles most degradation cases. MLC (2 bits per cell, 4 voltage states) has tighter voltage margins, so BCH correction reaches its limit sooner on worn MLC dies. When BCH can't correct enough errors, the page is flagged as uncorrectable & gaps appear in the reconstructed image.
LDPC Soft-Decision Decoding on TLC & QLC Monolithic NAND
Modern TLC monolithic NAND (3 bits per cell, 8 voltage states) uses LDPC codes instead of BCH. LDPC is a soft-decision code: rather than reading the cell once & declaring each bit 0 or 1, PC-3000 Flash reads the same physical page multiple times at slightly different reference voltages. Each read shifts the Vref threshold by 25mV increments.
Borderline cells flip state near the threshold boundary. A cell that reads as "1" at Vref and "0" at Vref + 25mV is sitting on the boundary. The software assigns a Log-Likelihood Ratio (LLR) to every bit based on how many reads agreed. High LLR means the cell is firmly in one state. Low LLR means it's ambiguous. The LDPC belief-propagation algorithm uses these confidence values to correct far more errors per sector than BCH can handle with a single hard read.
Vref Shifting for Degraded Cells
NAND cells drift over time. Charge leaks from the floating gate through the tunnel oxide, shifting the cell's voltage away from where the controller originally placed it. Temperature cycling accelerates this drift. The Vref values the controller assumed at write time no longer match the cell's actual charge state months or years later.
TLC NAND has 7 voltage boundaries separating 8 distinct states. PC-3000 Flash adjusts each boundary independently. Shifting all 7 thresholds by 50-100mV can bring pages that LDPC initially flagged as uncorrectable back into the correctable range. The technician starts with a coarse sweep across the full Vref range, identifies the offset that produces the lowest raw bit-error rate, then fine-tunes in 10mV steps.
Thermal Stabilization During Reads
Data written to NAND at 40°C and read at 20°C shows shifted voltage distributions because the cell's threshold voltage is temperature-dependent. In severe degradation cases, physically warming the monolithic chip while it sits on the Spider Board brings the cell voltages closer to their original write-time states. A controlled heat source holds the package at 35-45°C during the multi-pass LDPC read cycle; this narrows the voltage distribution spread & gives the soft-decision algorithm cleaner input data.
Multi-pass LDPC with Vref shifting is compute-intensive. A 128GB TLC monolithic dump where every page requires 7+ read passes at different voltages generates hundreds of gigabytes of raw read data. The LDPC decoder runs multithreaded across every available CPU core in the Transformation Graph's ECC node. Processing time scales with NAND degradation: a lightly worn device finishes in hours, while a heavily cycled device near its endurance limit can take a full day per die.
FTL Reconstruction
The Flash Translation Layer maps logical block addresses (what the file system sees) to physical NAND page addresses (where data actually sits in the flash). Each controller implements its own FTL algorithm. Block mapping, page mapping, hybrid mapping, and log-structured approaches all produce different physical data layouts.
Reconstructing the FTL means reading the controller's metadata pages (usually stored in reserved NAND blocks), parsing its mapping tables, & rebuilding the logical-to-physical address translation. If metadata blocks are corrupted, partial reconstruction is possible using file system signatures & file carving.
PC-3000 Flash Transformation Graph
PC-3000 Flash coordinates XOR descrambling, ECC correction, & FTL reconstruction through a node-based processing pipeline called the Transformation Graph. Each processing step is a node; the output of one feeds the input of the next. The technician builds the graph by adding nodes in the correct sequence for that controller family.
- Raw Chip Node. The unprocessed binary dump from the NAND reader. ECC & XOR corrections apply only on the Transformation Graph, never directly to this source data.
- Page Format Node. Defines the NAND page structure: data area size, spare area (OOB) layout, & ECC sector boundaries. Wrong page format parameters misalign every subsequent step.
- ECC Node. Auto-detects the error correction polynomial (BCH or LDPC) & applies bit-level correction. QLC dumps push all available CPU cores during this step; 128GB+ dumps can take hours of multithreaded LDPC computation.
- XOR Descrambling Node. Applies the correct key from PC-3000's controller database. For controllers with dynamic XOR (Silicon Motion, newer Alcor), the key changes per block & is calculated on the fly.
- Interleave Node. Reassembles data striped across internal planes or logical units. Controllers split writes across planes for throughput; this node reverses the split into sequential data.
- FTL Rebuild Node. Parses block markers or translator tables to reconstruct the logical-to-physical address map. Outputs a virtual disk image with sectors in the correct LBA order.
If any node produces unreadable output, the technician backtracks: wrong XOR ID, wrong page format, or missed interleaving pattern. Each node's output can be inspected independently, making the debugging process visible instead of opaque.
Which Controller Families Present Specific Recovery Challenges?
Every monolithic NAND controller family implements different wear-leveling algorithms, XOR scrambling patterns, interleaving schemes, & FTL structures. A recovery procedure that works for a Phison-based USB drive won't work on an Alcor or Chipsbank device. The controller determines the difficulty, duration, & PC-3000 Flash configuration required.
Phison (PS2251)
Phison PS2251-series USB controllers dominate budget flash drives & SD cards. These controllers store the FTL in reserved NAND blocks alongside user data. When those blocks degrade from write fatigue or sudden power loss, the controller fails to boot its firmware & drops into ROM mode. The device appears as an unrecognized USB mass storage device with 0 bytes capacity. PC-3000 Flash enters Phison's vendor-specific technological mode, dumps the raw NAND, & rebuilds the FTL from surviving metadata in the spare area.
Silicon Motion (SM3267, SM3281)
Silicon Motion controllers create virtual logical memory by splitting a single physical die into multiple logical planes. Data is striped across these planes for write throughput. During reconstruction, the logical planes must be arranged in the exact order the controller used; swapping Part 0 & Part 1 scrambles the entire output. SM-series controllers also use dynamic XOR with page-number-dependent keys, requiring per-plane format settings in the Transformation Graph.
Alcor Micro (AU6989, AU6998)
Alcor controllers appear in branded & generic high-capacity USB flash drives. Newer Alcor controllers generate a dynamic XOR key that varies per physical block. A static key overlay fails on these controllers because the scrambling pattern changes across the entire NAND. Recovery requires PC-3000 Flash's block-level dynamic decryption, applying a unique key calculation for each block in sequence.
Chipsbank (CBM209x)
Chipsbank controllers appear in low-cost promotional & COB (chip-on-board) USB drives. CBM209x controllers use dynamic XOR scrambling, adding per-block key variation on top of the NAND reconstruction. The FTL compounds the difficulty: Chipsbank doesn't store block number markers in the NAND spare area. Without block markers, traditional sequential reassembly fails. PC-3000 Flash uses specialized translator algorithms that parse Chipsbank's internal L2P routing tables from reserved service blocks to reconstruct the logical drive image.
Innostor (IS917)
Innostor IS917 controllers use multi-channel interleaving & proprietary scrambling. Data is striped across multiple chip enable (CE) targets within the monolithic package. Recovery requires de-interleaving across all CE targets, applying the correct scramble pattern, & running soft-ECC passes before the logical-to-physical map can be rebuilt.
Monolithic vs. Multi-Chip: How Does Recovery Differ?
Standard chip-off recovery works on multi-chip SSDs by desoldering individual NAND packages & reading them on standalone chip readers. Monolithic NAND recovery differs in several ways that affect complexity, duration, & cost.
| Factor | Multi-Chip (Standard Chip-Off) | Monolithic NAND |
|---|---|---|
| NAND Access | Desolder discrete chips; read in standard adapter | Identify pinouts on fused package; wire-bond or probe pads |
| Chip Reader Compatibility | Standard TSOP-48 or BGA adapters fit most discrete NAND | Custom adapters or manual wire bonding required for each package type |
| Interleaving | Data striped across 2, 4, 8, or 16 separate chips | Single die; internal interleaving within one package |
| Encryption Risk | Multi-chip SSDs often use always-on AES-256 (Samsung, Apple) | Small flash devices (USB, SD) rarely implement hardware encryption |
| Physical Risk | BGA rework; risk of pad lifting during desolder | Wire bonding to micro-scale pads; risk of bridge shorts or pad damage |
The lower encryption risk on monolithic flash devices is the key advantage. Most USB drives & SD cards don't implement controller-bound AES encryption. If the NAND is physically readable, the data can be reconstructed. This contrasts with modern NVMe SSDs where a dead controller means lost encryption keys & unrecoverable ciphertext.
What Are the Most Common Monolithic NAND Failure Modes?
Monolithic NAND devices fail differently than multi-chip SSDs. The integrated design means a single point of failure can disable the entire device with no fallback path through standard tools.
- Controller silicon failure. The integrated controller portion of the monolithic die burns out due to ESD, power surge, or manufacturing defect. The device is invisible to every computer it's connected to. The NAND portion may be intact, but there's no interface to reach it.
- Broken USB connector. The USB plug snaps off the PCB, tearing traces that connect to the monolithic chip. If the damage is limited to the connector & traces, the NAND data lines inside the monolithic package are unaffected. Recovery bypasses the connector entirely.
- Water or corrosion damage. Liquid exposure corrodes the fine traces between the monolithic die & the PCB pads. The controller may partially function (device detected but returns I/O errors) or fail entirely. Cleaning & direct NAND access bypasses the corroded interface traces.
- Firmware corruption in the controller. The controller's internal firmware becomes corrupted (often from unsafe ejection or power loss during a write). The device may appear with 0 bytes capacity, show an incorrect model name, or lock into a factory test mode. On monolithic devices, firmware isn't stored on a separate ROM chip; it lives in reserved NAND blocks managed by the controller itself.
- NAND wear-out. Flash cells reach their program/erase endurance limit. Read errors accumulate beyond what the ECC can correct in real-time. The controller marks blocks as bad until capacity drops to zero or the device becomes unreadable. Raw NAND access with software ECC applied at wider thresholds can recover data that the real-time controller couldn't.
When Does Monolithic NAND Recovery Not Work?
Not every monolithic flash device is recoverable. Physical destruction of the silicon die, prolonged fire exposure above 300C, and TRIM-erased blocks represent permanent data loss scenarios where no lab can reconstruct the original data. A free evaluation determines recoverability before any paid work begins; no data, no charge applies regardless.
- Cracked or shattered silicon die. If the monolithic package is physically broken and the silicon is fractured, the NAND cells are destroyed. No reading method can recover data from damaged silicon.
- Fire-damaged devices. Sustained high temperature (above 300C) destroys NAND cell charge states. Short exposure may leave data recoverable, but prolonged fire damage makes the silicon unreliable at the cell level.
- Undocumented proprietary controllers. Some monolithic chips use controllers with no publicly known pinout & no support in PC-3000 or any flash reader database. Reverse-engineering an unknown pinout is possible but adds time & cost. We'll quote this upfront.
- TRIM-erased data. If the device supported TRIM & the OS executed TRIM commands before the failure, the controller unmapped those logical addresses and scheduled garbage collection. Once garbage collection completes, the erased NAND pages read as 0xFF and the data is gone. No lab can reconstruct deallocated blocks. Most USB & SD devices don't support TRIM, but some newer SD Express & UFS cards do.
How Does Monolithic NAND Recovery Connect to SSD Data Recovery?
Monolithic NAND recovery uses the same microsoldering skills, NAND reading equipment, & data reconstruction tools that drive SSD data recovery. The Hakko FM-2032 iron that bonds wires to a monolithic USB die is the same iron that replaces a shorted capacitor on an NVMe SSD's PCB. The PC-3000 Flash software that processes a monolithic dump also handles multi-chip NAND reconstruction from full-size SSDs.
The core difference is encryption. Most USB flash drives & SD cards don't implement hardware AES encryption, so raw NAND reads produce recoverable data. Modern SATA & NVMe SSDs encrypt all data at the controller level with AES-256. For encrypted SSDs, the recovery path is board-level repair of the original controller so the encryption engine functions normally. For unencrypted monolithic devices, the recovery path is direct NAND access & reconstruction.
Both paths require board-level microsoldering, thermal profiling with FLIR cameras, & PC-3000 diagnostics. A lab that can bond 40 AWG wire to a 0.3mm monolithic pad can replace a 0402 capacitor on an NVMe PCB. The skills transfer directly.
Frequently Asked Questions
What is monolithic NAND and why can't normal tools recover it?
How much does monolithic NAND recovery cost?
Which devices use monolithic NAND?
Can you recover data from a physically broken USB flash drive?
Is monolithic NAND recovery the same as chip-off?
How long does monolithic NAND recovery take?
Which NAND controller families does your lab support for monolithic recovery?
USB drive or SD card not detected?
Free evaluation. Firm quote. No data, no fee. Monolithic NAND recovery from $1,200–$1,500.