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

(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.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.