What they did
The poster found an old Toshiba mSATA SSD from a Vaio hybrid laptop in a drawer. It had been dead for about two years: stuck in protection mode, reporting only 64KB of capacity and blocking SMART commands. They plugged it into their Linux machine and asked Codex to research the drive and get read and write access to the NAND chips. They fed it photos of the part numbers printed on the NAND and controller chips. Codex worked through the problem on its own, at one point connecting over SSH to a Windows machine to run vendor tools there before the drive went back into the Linux box.
How it went
After about an hour the drive worked again. The poster formatted it as NTFS and wrote about 10GB to it without errors, and now uses it as a 128GB portable SSD. They called it a test that unexpectedly worked. In the same post they say Codex also patched an old game, From Dust, the day before to run at 165 FPS with working physics and without its publisher's launcher. No details are given for either fix beyond that.
Worth knowing
The post does not say which tools or commands Codex used, so there is no recipe to follow, and the poster notes they hope the drive keeps working. One commenter suggested going further and switching the flash to pSLC mode for speed at a quarter of the capacity. Letting an agent run low-level tools across two machines carries real risk to any data on the drive.