Any restrictions or recommendations regarding SD cards?

[Christoph Derndorfer]

Hi Rodolfo,

I think the idea is to use it as a storage device.

Christoph

On Fri, Mar 25, 2011 at 12:56 AM, Rodolfo D. Arce S. <
rodolfo.arce.s at gmail.com> wrote:

> Christoph:
>
> 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
>
> R
>
>
> 2011/3/24 Christoph Derndorfer <christoph.derndorfer at gmail.com>
>
>> Scott, Arnd,
>>
>> thanks a lot for your comments and suggestions, much appreciated! :-)
>>
>> Cheers,
>> Christoph
>>
>> 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
>>> with
>>> > SD cards. Are there any restrictions wrt size, speed, etc. that they
>>> should
>>> > 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
>>> XO-1
>>> > 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
>>> https://wiki.linaro.org/WorkingGroups/KernelConsolidation/Projects/FlashCardSurvey
>>>
>>> Stay away from brands that typically have only one writable allocation
>>> unit, these will be slow and wear out very quickly when formatted with
>>> ext3
>>> or other Linux file systems. Higher is better here, and it's something
>>> that
>>> is usually not reflected in the speed class rating. Also avoid those that
>>> only
>>> 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
>>> are
>>> 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
>>> before
>>> you buy a lot of them, in return for more data for my survey page ;-).
>>>
>>>        Arnd
>>>
>>
>>
>>
>> --
>> Christoph Derndorfer
>> co-editor, olpcnews
>> url: www.olpcnews.com
>> e-mail: christoph at olpcnews.com
>>
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>>
>
>
> --
> *Rodolfo D. Arce S.*
> web: rodolfoarce.com
> twitter: @rodolfoarces <http://twitter.com/rodolfoarces>
>
>
>
>


-- 
Christoph Derndorfer
co-editor, olpcnews
url: www.olpcnews.com
e-mail: christoph at olpcnews.com
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