Any restrictions or recommendations regarding SD cards?
christoph.derndorfer at gmail.com
Thu Mar 24 20:08:47 EDT 2011
I think the idea is to use it as a storage device.
On Fri, Mar 25, 2011 at 12:56 AM, Rodolfo D. Arce S. <
rodolfo.arce.s at gmail.com> wrote:
> You're talking about running the OS from the card?
> Because you could use it as an external drive only. But I'm gessing that if
> you take I/O into account you're going for the first option
> 2011/3/24 Christoph Derndorfer <christoph.derndorfer at gmail.com>
>> Scott, Arnd,
>> thanks a lot for your comments and suggestions, much appreciated! :-)
>> On Thu, Mar 24, 2011 at 10:36 PM, Arnd Bergmann <arnd at arndb.de> wrote:
>>> On Thursday 24 March 2011 20:26:05 Christoph Derndorfer wrote:
>>> > Hi all,
>>> > the folks from the Austrian pilot project want to equip the XO-1s there
>>> > SD cards. Are there any restrictions wrt size, speed, etc. that they
>>> > be aware of when purchasing the SD cards? I'm particularly asking after
>>> > reading James' mention of seeing more issues with newer cards and the
>>> > power off bug.
>>> > Or asked the other way 'round: Are there any particular cards or
>>> > manufacturers which people can recommend?
>>> Have a look at my list at
>>> Stay away from brands that typically have only one writable allocation
>>> unit, these will be slow and wear out very quickly when formatted with
>>> or other Linux file systems. Higher is better here, and it's something
>>> is usually not reflected in the speed class rating. Also avoid those that
>>> support linear I/O.
>>> Sandisk cards tend to be ok (especially the Ultra and Extreme versions),
>>> Kingston tends to be really bad, most others have somewhat mixed results
>>> though sometimes the cheapest ones can be really good.
>>> Class 10 cards are not required to support efficient random I/O, so they
>>> sometimes slower than Class 6 cards from the same manufacturer.
>>> If you buy a sample, I'll gladly help you figure out if it's any good
>>> you buy a lot of them, in return for more data for my survey page ;-).
>> Christoph Derndorfer
>> co-editor, olpcnews
>> url: www.olpcnews.com
>> e-mail: christoph at olpcnews.com
>> Devel mailing list
>> Devel at lists.laptop.org
> *Rodolfo D. Arce S.*
> web: rodolfoarce.com
> twitter: @rodolfoarces <http://twitter.com/rodolfoarces>
e-mail: christoph at olpcnews.com
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