LaCie d2 Professional and 6big units at 14TB and above contain Seagate Exos helium drives. Mechanical recovery requires opening the sealed chamber, replacing the head stack, and refilling with high-purity helium before the drive will read. We perform helium head swaps in-house at our Austin lab. Head swap pricing starts at $3,000–$4,500.
LaCie d2 Professional and 6big units at 14TB, 16TB, 18TB, and 20TB capacities ship with helium-filled drives, typically the Seagate Exos X16 / X18 / X20 family. Helium drives use a hermetically sealed chamber at roughly one atmosphere. The reduced gas density lets the drive fit more platters into the same 3.5-inch footprint with thinner platter spacing and lower aerodynamic drag on the head stack.
That same architecture makes mechanical recovery harder: opening the sealed lid releases the helium, the platter geometry is tighter than a standard air drive, and the heads must be re-installed and the chamber refilled before the drive will read.
We perform helium head swaps in-house. We do not refer or outsource these jobs. The workflow runs in our 0.02 micron ULPA-filtered clean bench, not a glovebox: the lid seal is broken, the patient head stack is removed, a matched helium donor head stack is transplanted, the lid is re-seated with a fresh gasket, and the chamber is refilled with high-purity helium through the manufacturer's service port before pressure verification and PC-3000 imaging. Pricing follows our helium drive data recovery tiers: head swap is $3,000–$4,500, surface damage is $4,000–$5,000. Helium cost: $400-$800 additional for head swap and surface damage tiers. This covers the helium refill required after opening the sealed chamber. Helium donor drives must be an exact match. Typical donor cost: $200–$600 depending on model and availability, plus helium refill cost ($400–$800) required after opening the sealed chamber. +$100 rush fee to move to the front of the queue.
Why Helium Donor Matching Is Stricter
Helium Exos drives use a 9-platter or 10-platter stack with sub-millimeter head-to-platter spacing. The micro-jog values, which are the per-head offsets that compensate for manufacturing tolerances between read elements, are calibrated assuming a helium atmosphere. Air-fill substitution is not an option; the heads fly at the wrong altitude and contact the platter within minutes. A donor must match: same capacity, same firmware family, same site code, same head map, and crucially the same preamp revision so the channel calibration written into the patient's adaptive parameters remains valid after the swap.
Bridge Architecture on 14TB+ d2 Units
The high-capacity d2 Professional Thunderbolt 3 enclosures pair the helium Exos drive with an Intel Alpine Ridge or Titan Ridge controller (JHL6340 or JHL7440) feeding a downstream PCIe-to-SATA bridge HBA that interfaces with the drive. The helium drive itself is unaware it lives in a Thunderbolt enclosure; once extracted, it presents as a standard SATA drive to PC-3000. That separation matters for diagnostics: a dead Thunderbolt port on the d2 chassis does not imply any damage to the helium drive inside, and recovery on a healthy drive inside a dead Thunderbolt 3 enclosure is a simple copy at $100 after extraction.
Do not let an unequipped lab open your helium drive. Once the lid is broken without helium refill capability, the chamber is contaminated and a second lab cannot simply re-seal it. Confirm a recovery provider has documented in-house helium refill before authorizing mechanical work.
