Date: Tue, 22 Mar 2016 20:11:46 +0800 From: Jia-Shiun Li <jiashiun@gmail.com> To: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: Effect of partitioning on wear-leveling Message-ID: <CAHNYxxMPHs4g=F7CqMEZTD23gfw%2Bb%2Bh1eTax=oUVFXW5UHQ03A@mail.gmail.com> In-Reply-To: <20160322062635.GD64087@server.rulingia.com> References: <20160321175952.GA83908@www.zefox.net> <1458586884.68920.96.camel@freebsd.org> <20160321221153.GB83908@www.zefox.net> <1458600070.68920.107.camel@freebsd.org> <20160322032832.GC83908@www.zefox.net> <E985EBE6-E062-4C5E-8F85-ECB7BDE98DE8@bsdimp.com> <20160322062635.GD64087@server.rulingia.com>
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On Tue, Mar 22, 2016 at 2:26 PM, Peter Jeremy <peter@rulingia.com> wrote: > On 2016-Mar-21 21:47:39 -0600, Warner Losh <imp@bsdimp.com> wrote: > >So let=E2=80=99s do the math. 512MB cards tended to have write speeds of= maybe > 6MB/s. > >At 6MB/s, that=E2=80=99s about 518MB/day, or one drive write per day. Mo= st SD > cards, > > I think you dropped some zeroes there. 6MB/s =3D=3D 518,400MB/day =3D=3D > 518GB/day. > That's 1000 drive writes/day - which is non-trivial. > > btw at the days of 512MB cards they are mostly made of SLC nand flash, some were beginning to transition to MLC. They are different from TLC these days in terms of endurance.
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