The drive is failing. Reallocated sectors is so high that they're are almost no
reserve sectors remaining at which point any additional bad sectors well result in write
failure. So in any case it needs to be replaced.
The array it's in is an Intel firmware RAID, sometimes annoyingly called "fake
RAID" so it might be going inactive due to some firmware policy in order to get the
users attention? But ultimately under Linux is managed by the Linux MD driver and mdadm.
Usually these are boot volumes or Windows volumes. Otherwise you'd just set it up with
mdadm superblock/metadata like the others.
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