[FreeBSD-Announce] Foundation Announces NAND File System for FreeBSD Project

[Freddie Cash]

On Fri, Mar 2, 2012 at 8:28 AM, Freddie Cash <fjwcash at gmail.com> wrote:
> On Fri, Mar 2, 2012 at 7:30 AM, Julian H. Stacey <jhs at berklix.com> wrote:
>> Hi freebsd-fs at 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.

Let's try actually including the link this time:

http://www.anandtech.com/show/5067/understanding-tlc-nand

-- 
Freddie Cash
fjwcash at gmail.com