Case Study — SSD Data Recovery
SanDisk SSD Plus, 240GB, stopped mounting. Every sector still had to be fought for.
A software recovery attempt had already failed by the time this drive reached the lab. Worn NAND chips had left the controller stuck in a panic-busy state, unable to load its own firmware — let alone hand over a client's files. Getting the data back meant building a working firmware translator from scratch and imaging badly degraded flash at a fraction of normal speed.
The case
A SanDisk SSD Plus that had already been through software recovery.
The client arrived with a SanDisk SSD Plus, 240GB, that had stopped being detected by the computer. A software recovery tool had been tried first — understandable, and often harmless on a mechanical hard drive. On a worn SSD it changes nothing: the drive still would not mount, and the NAND damage underneath was never something software running from outside the drive could touch.
SanDisk SSD Plus drives are common and inexpensive, and in this laboratory's experience they are a genuinely difficult recovery target. Roughly half of the SanDisk SSD Plus cases handled here return only fair or poor results, purely because of how these drives' NAND chips are built and how they fail.
What failed
Worn NAND, and a controller that could not get out of its own way.
The controller was stuck in what SanDisk's firmware calls a panic-busy state. Worn NAND chips were throwing enough read errors that the controller could not fully load its own firmware from the service areas of the flash — the areas it needs to boot before it can present a single byte of user data to a host computer. From outside, that just looks like a drive that has vanished.
Recovering from this state means building a way in that bypasses the drive's normal boot sequence entirely, then coaxing usable data out of NAND that is already failing.
The recovery
Forcing the drive back to life, one stage at a time.
- 01
Factory mode
The SSD was removed from its enclosure and two contact pins bridged, forcing the controller into a safe factory-mode boot — waiting for new firmware instead of repeatedly trying, and failing, to load its own.
- 02
Custom firmware, loaded manually
Using PC3000 SSD, the lab's specialist recovery platform, custom firmware was uploaded through a loader file to bring the controller up in a controlled state.
- 03
Rebuilding a translator
A translator — the firmware logic that maps physical NAND sectors to the drive's user data — was then built from scratch. Without one, the customer's files cannot be addressed at all.
- 04
Mapping the degraded NAND
A sector map showed which areas of flash could still be read cleanly and which were badly worn. Around 45-50% of sectors read without error on the first pass; the rest needed slower, repeated rereads to pull back what the failing chips would give up.
- 05
Imaging at 0.5MB/s
The NAND damage held read speeds to around 0.5MB/s across the drive — slow enough that the client's Desktop folder alone, at 102GB, took roughly three days to image.
The result
Access restored, and the client's files imaged off failing flash.
Once the translator was in place, the drive's user data became addressable and imaging began in earnest — sector by sector, working around the areas of NAND too degraded to return clean data on demand.
Nothing about a SanDisk SSD Plus sitting in a panic-busy state hints at how much firmware-level work sits between "drive not detected" and a client getting their files back. Cases like this are why we treat every SanDisk SSD Plus recovery as its own project rather than a routine clone — see our SSD data recovery process for how this fits into the wider lab workflow.
Worn NAND and firmware faults like this one only get harder to recover from the longer a drive keeps trying — and failing — to boot itself. Get a straight assessment before more damage is done.