Verbatim Store ‘N Go 8GB (Phison PS2251-68-5) – Off-Chip Recovery, Custom Tooling

Got an 8GB Verbatim Store ‘N Go in this week with a Phison PS2251-68-5 controller. We did an off-chip recovery — pulled the NAND, read it on a flash memory reader, and reassembled the raw data by hand. A couple of things made this one interesting. The layout used 15 pages per sector instead of the usual 16, and there were bad byte columns running through the NAND that none of the existing recovery tools knew how to deal with, so we ended up writing our own. From there it was the usual workflow with a few extra steps — strip the bad byte columns, fix the bit errors, and use the spare area markers to reassemble the logical image. Came out clean and the customer got their data back.