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Is it dangerous to use the -y or -Y flag in hdparm during a write, or when the disk is still mounted, or will hdparm refuse to spin-down, or automatically sync and unmount?

  • Haven't tested recently, but I think it will spin down even while mounted. Give it a try, with a new/test partition if worried – Xen2050 Dec 17 '14 at 6:04
  • hdparm man page has not listed those parameters as 'DANGEROUS', so I would assume that it is ok. Also, the same man pages mentions that Linux IDE drivers will handle the reset required to wake from sleep mode (-Y). – Toni Jun 6 '15 at 15:22
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(I am sorry for providing an answer which is not an answer, but a comment - for some reason I can't comment until I have 50 reputation.)

Just FYI: I recently issued (by mistake!) an hdparm -y command to my drive while mounted. I don't believe it was writing at the time, but definitely reading. It did make a "funny", mechanical noise, like a rattling, for a few seconds, but since then it has worked 100 % fine. It doesn't seem to be ruined. Yet.

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