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In a german ubuntu guide for the hddtemp program is claimed that every S.M.A.R.T. request wakes up the drive although no data is read. Because some harddrives that can park their head into a parking position can do so only a certain number of times and will wear off earlier. I never heard or read about this before.
I wonder if the claim is true at all and why the head has to be put out of its parking position when only SMART is requested. The statement that only certain drives can actually park their head confuses me more, how do I confirm that my drives do or not? And will the once per minute request that hddtemp does really have a noticable effect on my drives? I mean they will die sooner or later anyway.
I'd also appreciate more sources on this topic than just a statement written to some wiki.
2I don't imagine parking the head has any effect on how long the drive lasts. Spin up cycles on the other hand can kill a drive if there are too many, but is rare this happens anymore. – Moab – 2012-01-13T16:39:44.887
1Just to increase the confusion, why would they read smart if the drive has been put on standby ? My highpoint controller has smart capability, yet the drives go to sleep quite nicely still, but I do not regularly monitor its temps via the raid manager. and now that you mention it, the one drive I have in smartfan being temperature checked , I dont think it goes to sleep. Very interesting Question. – Psycogeek – 2012-01-13T16:48:59.410
1> Spin up cycles on the other hand can kill a drive if there are too many... I have read this often, but never understood how exactly does spinning up the spindle could wear the drive out any more than any other activity. > but is rare this happens anymore. I had not heard this part. So—counterintuitively—modern drives are more sturdy and can withstand being turned on and off several times a day/several thousand times in it's lifetime? If so, then there is no reason not to turn a system off when it's not going to be used for a while. – Synetech – 2012-06-07T22:21:31.863
hmm, Speedfan seems to get SMART data really quick, it doesn't look like it makes many requests at all. Almost seems like the data's just there for it! Does hddtemp do SMART differently?! – barlop – 2013-01-18T16:19:13.683
@barlop the problem is, that although no data is read directly from the platters, they do spin up. I guess the SMART data is available before they are completely spun up, as it is stored on the controller of the drive. – Baarn – 2013-01-18T16:29:31.110