Date: Fri, 2 Mar 2012 08:29:09 -0800 From: Freddie Cash <fjwcash@gmail.com> To: "Julian H. Stacey" <jhs@berklix.com> Cc: freebsd-fs@freebsd.org, Deb Goodkin <deb@freebsdfoundation.org> Subject: Re: [FreeBSD-Announce] Foundation Announces NAND File System for FreeBSD Project Message-ID: <CAOjFWZ4WzDh2=y4Fir2bLB6koSUZO2AbB9r7U1fNMzbshcvPXQ@mail.gmail.com> In-Reply-To: <CAOjFWZ4Xdk=fojhFLb7oufOaktAc9Phx748aW7=zSiu18=aVeA@mail.gmail.com> References: <4F4FC3E1.5040700@freebsdfoundation.org> <201203021530.q22FUjOU040478@fire.js.berklix.net> <CAOjFWZ4Xdk=fojhFLb7oufOaktAc9Phx748aW7=zSiu18=aVeA@mail.gmail.com>
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On Fri, Mar 2, 2012 at 8:28 AM, Freddie Cash <fjwcash@gmail.com> wrote: > On Fri, Mar 2, 2012 at 7:30 AM, Julian H. Stacey <jhs@berklix.com> wrote: >> Hi freebsd-fs@freebsd.org >> cc Deb >> >> Deb Goodkin wrote to announce@ Thu, 01 Mar 2012 11:45:53 -0700 (19:45 CE= T): >>> The FreeBSD Foundation is pleased to announce that Semihalf, an >> ... >> >> I was interested to read more background, but no URLs, >> so I found http://www.semihalf.com/ & re. >> =C2=A0 =C2=A0 =C2=A0 =C2=A0NAND Flash File System >> found: >> =C2=A0http://en.wikipedia.org/wiki/Flash_memory#NAND_flash >> =C2=A0 =C2=A0 =C2=A0 =C2=A0"Manufacturers try to maximize the amount of = usable storage >> =C2=A0 =C2=A0 =C2=A0 =C2=A0by shrinking the size of the transistor below= the size where >> =C2=A0 =C2=A0 =C2=A0 =C2=A0they can be made reliably, to the size where = further >> =C2=A0 =C2=A0 =C2=A0 =C2=A0reductions would increase the number of fault= s faster than >> =C2=A0 =C2=A0 =C2=A0 =C2=A0it would increase the total storage available= ." >> =C2=A0 =C2=A0 =C2=A0 =C2=A0- >> =C2=A0 Really scarey if that is taken literaly, I jhs@ presume loose phr= aseology, >> =C2=A0 =C2=A0 =C2=A0 =C2=A0hopefully someone who knows more will rephras= e that :-). > > A good primer on NAND Flash with lots of info on "the next hot thing", > triple-level cell (TLC) flash, which has all the flaws of MLC > multiplied many times over, but is a lot less expensive to use/make, > so expect it to hit consumer drives this year. =C2=A0:( =C2=A0Page 3 is > extremely enlightening about the issues, especially regarding the > increased CRC requirements in order to actually read a valid bit from > the cell. Let's try actually including the link this time: http://www.anandtech.com/show/5067/understanding-tlc-nand --=20 Freddie Cash fjwcash@gmail.com
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