Date: Mon, 19 Dec 2011 23:01:15 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Alexander Best <arundel@freebsd.org> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org Subject: Re: can a wrong alignment cause a decrease in a hdd's life expectancy? Message-ID: <78665.1324335675@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 19 Dec 2011 22:56:33 GMT." <20111219225633.GA77147@freebsd.org>
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In message <20111219225633.GA77147@freebsd.org>, Alexander Best writes: >no problem. so will the improper alignment also not cause a life expectancy >shortage in case of a hdd (non-flash-based)? Well, theoretically you will have more track-to-track seeks, as some blocks will span cylinders, but I doubt that will have measurable impact on lifetime, compared with the gains you could harvest if you spin it down for even just 1 hour a day... Read-Only/Read-Write makes no difference that I know of for hard-disks. >and one other question: the hdd also supports usb 3. will the improper >alignment have any effect (speed wise) when connected via usb 3, or is even >usb 3 too slow to notice the performance drop due to the improper alignment? Again: I doubt it will be measurable. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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