Date: Fri, 2 Mar 2012 08:28:50 -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: <CAOjFWZ4Xdk=fojhFLb7oufOaktAc9Phx748aW7=zSiu18=aVeA@mail.gmail.com> In-Reply-To: <201203021530.q22FUjOU040478@fire.js.berklix.net> References: <4F4FC3E1.5040700@freebsdfoundation.org> <201203021530.q22FUjOU040478@fire.js.berklix.net>
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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 CET): >> 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. > NAND Flash File System > found: > http://en.wikipedia.org/wiki/Flash_memory#NAND_flash > "Manufacturers try to maximize the amount of usable storage > by shrinking the size of the transistor below the size where > they can be made reliably, to the size where further > reductions would increase the number of faults faster than > it would increase the total storage available." > - > Really scarey if that is taken literaly, I jhs@ presume loose phraseology, > hopefully someone who knows more will rephrase 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. :( Page 3 is extremely enlightening about the issues, especially regarding the increased CRC requirements in order to actually read a valid bit from the cell. -- Freddie Cash fjwcash@gmail.comhelp
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