Date: Wed, 14 Sep 2016 21:25:45 +0100 From: RW <rwmaillists@googlemail.com> To: freebsd-questions@freebsd.org Subject: Re: Best kind of hard drive for heavy use? Message-ID: <20160914212545.144b0719@gumby.homeunix.com> In-Reply-To: <12225.128.135.52.6.1473864923.squirrel@cosmo.uchicago.edu> References: <42.56.05022.D3A48D75@dnvrco-oedge02> <20160913213649.3a3f26b2@archlinux.localdomain> <0d1b8dba-3292-9991-ea7d-f160c25090c8@netfence.it> <20160914051806.297c0c3f@archlinux.localdomain> <20160914143327.3b7d3c36@gumby.homeunix.com> <12225.128.135.52.6.1473864923.squirrel@cosmo.uchicago.edu>
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On Wed, 14 Sep 2016 09:55:23 -0500 (CDT) Valeri Galtsev wrote: > On Wed, September 14, 2016 8:33 am, RW via freebsd-questions wrote: > > Drives are typically rated for 300k load-cycles, so at 30 minutes > > it's a non-issue - running the drive cooler and avoiding wear on > > the moving parts probably extends its life. > > > > Disagree. It is actually an opposite. Spinning down is the same as > turning the drive off: ... This is a big stress, and mechanism can > withstand only this number of such bangs. And the manufacturer quotes a value for that number of 300,000. The problematic WD drives went into standby after a fraction of a minute, so it was possible for them to fail prematurely. With a 30 minute timeout it would take 17 years of pathologically bad misuse to reach the rated value. > To the contrary, keeping > platters spinning does not apply any stress onto any mechanical > parts, except bearings, which can live very long, especially if > platter assembly is very well balanced and bearings are well designed > and manufactured. But you go on to say that consumer grade drives aren't designed to spin for a long-time which contradicts that. > In any case, "consumer" grade drives never come > to composite time of use like 8-10 years (drives on many servers are > up and always hot for about this long), As it happens I have a dock next to my TV that contains two drive that were manufactured in 2005 and 2009 and they are both still in good condition. If they'd being spinning 24/7 they'd both be long since dead. It seems to me that if you want to maximize the life of a consumer drive you have to let it spin-down.
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