[Discuss] ATA Access Errors For Spinning Disk

[richard.pieri at gmail.com (Rich Pieri)]

Assuming that the drives are good, you might be hitting the standby
problem. So-called "green drives" park their heads and go into standby
mode very quickly (a set of Western Digital Green series drives I have
park after 8 seconds idle). It can take a long time (tens of seconds)
for them to spin up again. This often is detected as a faulted device.
So much fun for RAID sets.

hdparm -S 241 /dev/sdX

sets the standby timer to 30 minutes. "-S 0" disables standby entirely,
but some drives ignore this setting.

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