There is currently bug in the kernel which breaks tools like hdparm and hddtemp.
$ hdparm -y /dev/sdb
/dev/sdb:
issuing standby command
SG_IO: bad/missing sense data, sb[]: f0 00 01 00 50 00 00 0a 80 00 00 00 00 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Source
Is there...