SSD Controller Recovery
Phison PS5021-E21T Data Recovery
The Phison PS5021-E21T is a budget PCIe Gen4 DRAM-less controller relying on Host Memory Buffer (HMB) to store translation tables in the host PC's system RAM. It gained infamy from a confirmed PCIe 4.0 data loss bug affecting 1TB M.2 2230 models (discovered by PCPartPicker, acknowledged by Phison). The bug triggers at Gen4 speeds but not Gen3, making Steam Deck (Gen3) less affected than ROG Ally (Gen4). PC-3000 SSD access for this controller is limited. Recovery starts at $200. No diagnostic fee.
Phison PS5021-E21T Specifications
| Manufacturer | Phison |
| Interface | NVMe Gen4 |
| NAND Types | 3D TLC, 3D QLC |
| DRAM Cache | No (DRAM-less) |
| Channels | 4 |
| PC-3000 Support | Limited / Generic NVMe |
| Chip-Off Viability | Not viable (AES-256 hardware encryption) |
PC-3000 support under development. DRAM-less HMB design. Critical for M.2 2230 drives in Steam Deck, ROG Ally, and Surface Pro.
Affected SSD Models
The Phison PS5021-E21T is deployed in the following consumer drives. A failure in this controller impacts access to the NAND flash on these specific models.
| # | Drive Model | Interface |
|---|---|---|
| 1 | Sabrent Rocket 2230 | NVMe Gen4 |
| 2 | Corsair MP600 Mini/Core | NVMe Gen4 |
| 3 | Crucial P3/P3 Plus | NVMe Gen4 |
| 4 | Kingston NV2 (some variants; also ships with SM2267XT, E19T, SM2269XT) | NVMe Gen4 |
| 5 | Team Group MP44S | NVMe Gen4 |
Common Failure Modes and Symptoms
Each failure mode below describes a specific way the Phison PS5021-E21T fails and the symptoms you will observe. If your SSD matches any of these patterns, do not run recovery software; it cannot communicate with a dead controller. See why SSDs report 0 bytes for a deeper technical explanation of controller and FTL failures.
- PCIe 4.0 permanent data loss bug
Reproducible permanent data loss bug discovered by PCPartPicker. Under specific heavy sequential write/read workloads at PCIe 4.0 speeds, the controller fundamentally corrupts its FTL state and generates physical bad block flags. The bug does not reproduce at PCIe 3.0 speeds (which is why Steam Deck users rarely encounter it, while ROG Ally users do). Data lost to this specific bug is completely unrecoverable.
- Data silently corrupted during heavy workloads
- Files unreadable after writing
- Drive appears healthy but data is gone
- Bad Block Errors in Windows Event Viewer
- Firmware failure / 0MB detection
Service Area corruption beyond the controller's self-repair capability causes the drive to enter ROM Mode. The drive reports 0MB capacity or fails to enumerate in BIOS entirely. Common in aftermarket 2230 SSD upgrades for Steam Deck, ROG Ally, and Surface Pro.
- SSD shows 0MB capacity
- RAW partition after power loss
- BSOD on boot
- Steam Deck not booting after SSD upgrade
- HMB sync failure from system crash
The DRAM-less E21T stores FTL mapping tables in the host computer's system RAM via Host Memory Buffer. A hard crash, unexpected reboot, or sudden power loss deallocates this RAM before the controller can flush the mapping state to NAND, resulting in catastrophic FTL corruption. The dispersed metadata (designed for HMB, not local cache) makes reconstruction slower.
- Drive not detected after hard crash or freeze
- Drive dead after unexpected reboot
- 0MB capacity in BIOS after system crash
- Files missing after blue screen event
Phison PS5021-E21T Recovery Process
The PCIe 4.0 data loss bug generates physical bad block flags at the NAND level, not just logical FTL corruption. Files written during the bug's manifestation may contain permanent bit errors. Being DRAM-less, the FTL metadata is heavily dispersed across the NAND (designed for HMB read-in), making reconstruction significantly slower than DRAM-based controllers.
- Determine if the drive enters ROM Mode automatically from corrupted Service Area; if not, manually short ROM pins on the PCB
- Connect drive to PC-3000 Portable III via NVMe adapter (the Portable III establishes a proprietary PCIe link that bypasses standard link training vulnerabilities)
- Attempt firmware loader upload via PC-3000 NVMe utility (dedicated E21T support is under development; generic NVMe access provides limited but functional access)
- Bypass corrupted HMB caching algorithms and standard firmware to read surviving metadata directly from NAND pages
- Rebuild the Flash Translation Layer from dispersed NAND metadata and extract data
Equipment Used
- PC-3000 Portable III
- PC-3000 NVMe utility
Typical timeline: 6-10 hours
Learn more: how SSD controller encryption affects recovery | how wear leveling works
Transparent Pricing for NVMe Gen4 SSD Recovery
Flat-rate pricing with no diagnostic fees. The cost to recover data from a Phison PS5021-E21T-based SSD depends on the severity of the failure. For the full diagnostic path across controller, firmware, and NAND-level failures, see our SSD data recovery flagship; deleted-file cases are governed by DZAT and NAND physics. No data, no recovery fee. Full SSD recovery cost breakdown.
| Tier | What It Covers | Price |
|---|---|---|
| Simple Copy | Your NVMe drive works, you just need the data moved off it | $200 |
| File System Recovery | Your NVMe drive isn't showing up, but it's not physically damaged | From $250 |
| Circuit Board Repair | Your NVMe drive won't power on or has shorted components | $600–$900 |
| Firmware Recovery | Your NVMe drive is detected but shows the wrong name, wrong size, or no data | $900–$1,200 |
| PCB / NAND Swap | Your NVMe drive's circuit board is severely damaged and requires NAND chip transplant to a donor PCB | $1,200–$2,500 |
A donor drive is a matching SSD used for its circuit board. Typical donor cost: $40–$100 for common models, $150–$300 for discontinued or rare controllers. +$100 rush fee to move to the front of the queue.
Frequently Asked Questions
Can software recover data from a dead Phison PS5021-E21T?
Why not use chip-off recovery on Phison SSDs?
How much does Phison PS5021-E21T data recovery cost?
Can you recover deleted files from a Phison PS5021-E21T SSD?
Other Phison Controllers
Phison PS3111-S11
SATA · Kingston A400, PNY CS900 (some variants)
Phison PS3110-S10
SATA · PNY CS1311/CS2211, Patriot Ignite
Phison PS5012-E12
NVMe Gen3 · Corsair Force MP510, Sabrent Rocket NVMe
Phison PS5016-E16
NVMe Gen4 · Corsair Force MP600, Sabrent Rocket 4.0
Phison PS5018-E18
NVMe Gen4 · Corsair MP600 Pro/XT, Sabrent Rocket 4 Plus
Phison PS5027-E27T
NVMe Gen4 · Micron P310 2280, Timetec Gaming SSD (Gen4)
Need Phison PS5021-E21T Recovery?
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