SF-1200's classic disappearing from BIOS error. Unfortunately, Sandforce never did identify the cause of those random disappearances and thus never wrote a firmware fix. For some people updating the firmware will fix the issue, but there's no certainty to that. Similarly, a secure erase and re-install can solve it, at least temporarily. One other possibility for saving the drive is to pull the power cable and leave it for several hours. That can sometimes ressurect the drive.
However, before you do any of that I'd take the few minutes of operation you get each time you power-cycle (it's the unplugging the power cable which temporarily clears the lock) to pull whatever necessary files you can off the drive. You can't get much before the drive locks, but you should be able to retrieve some smaller files.
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