Comment by killerstorm

~12 years ago I installed Linux on Fujitsu UH572.

As an "ultrabook" it came with 16GB of fast SSD which could be used as a cache via some Windows-specific Intel feature, while main storage was a slower spinning disk.

As Linux did not support cache feature, I thought I can just format it as ext4 and use as a storage for things which can benefit from more iops, e.g. running DB tests. And as SSD technology was still rather new at that time, I started with running some IO benchmarks.

Well, it survived formatting into ext4 and few minutes of that IO benchmark, then it became permanently unresponsive.

My guess is that wear-leveling algorithm was designed specifically for the FS originally had (some version of FAT?), and different FS caused it to corrupt some internal data structure, so SSD's controller firmware went into panic on each boot.

Unfortunately, this added few minutes delay to boot as Linux tried to communicate with unresponsive SSD controller, but otherwise laptop worked fine...