Date: Mon, 19 Dec 2011 22:56:33 +0000 From: Alexander Best <arundel@freebsd.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> 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: <20111219225633.GA77147@freebsd.org> In-Reply-To: <32197.1324334968@critter.freebsd.dk> References: <20111219224700.GA75581@freebsd.org> <32197.1324334968@critter.freebsd.dk>
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On Mon Dec 19 11, Poul-Henning Kamp wrote: > In message <20111219224700.GA75581@freebsd.org>, Alexander Best writes: > >On Mon Dec 19 11, Poul-Henning Kamp wrote: > >> In message <20111219221617.GA70383@freebsd.org>, Alexander Best writes: > >> > >> >ps: the hdd only gets mounted read-only! > >> > >> There is no known wear-effects in flash storage as long as you > >> only read. > >> > >> You may need to do refresh-writes every 5-10 years to avoid > >> tunnel-leakage bit errors, but most flash controllers use semi-long > >> ECC syndromes and will do so on first bit that gives an read error. > > > >this is a regular hdd i believe -- no ssd. at least when i plug it into my > >usb drive i hear the hdd spinning up and causing vibrations. i don't think > >that would be the case with an ssd. > > Ahh, sorry, I don't know why I thought it was flash. no problem. so will the improper alignment also not cause a life expectancy shortage in case of a hdd (non-flash-based)? 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? cheers. alex > > > -- > 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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