Thanks for the information. It looks like I'm in an awkward situation:
old but potentially more reliable <2G card are getting harder and harder
to come by. SATA hard drives cost much more than a SD card and it's just
a waste of space.
hmmmm.
On 07/04/11 12:05, Matthew Smith wrote:
>
> FWIW - we've also seen file system issues when using SD cards. particularly
> when running at high temperatures.
>
> I also can confirm that SDHC cards (>2GB) do not work correctly using the TS
> SD kernel driver. Curiously a 4GB or 8GB SD card partitioned using the 512MB
> partition table provided by TS (e.g.
> ftp://ftp.embeddedarm.com/ts-arm-sbc/ts-7800-linux/binaries/ts-images/2.6.34-512mb-sd.dd.gz)
> works OK. As soon as the partition table is modified to include partitions
> that are greater than 2GB or are set at a>2GB boundary then errors are
> observed when reading or writing files.
>
> It is also impossible to edit the partition table using fdisk on the TS7800
> (tested on both Debian Lenny and Squeeze). Using the MMC drivers on an OpenRD
> (my main build machine for kernel compilation and OS image creation) I do not
> see this issue.
>
> As an alternative I am currently testing SATA-based storage using Intel X25M
> Postville SSDs - so far this is looking really good, huge performance
> increase and RAID1 mirroring too!
>
> For new applications I'm becoming quite insistent on using SATA instead of
> SD/MMC/USB storage.
>
> cheers
> Matt
>
> --- In "al"<> wrote:
>> We have also seen premature SD card failure. Although anecdotal, our
>> observations seem to indicate lack of quality in recently manufactured SD
>> cards from some Taiwan-based firms. Cards from other manufacturers seem to
>> last longer. Older SD cards with lower capacities have been in use for
>> years in our experience, so the manufacturing process for smaller geometries
>> must be more challenging than they can admit to.
>>
>> So, I would say the system is reliable, but the SD cards are not. ;-)
>> Good luck (to us all) in finding reliable SD cards...
>>
>> --- In Simon Leung<simonleung@> wrote:
>>> Thanks for the reply.
>>> ...
>>>
>>> I've replaced the SD card with another one and the problem seems to be
>>> gone (for now). If this is indeed a SD card issue, then the system is
>>> not very reliable in this regard: it's only been in use for a few weeks.
>>> And it's meant to be for month.
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
------------------------------------
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/ts-7000/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/ts-7000/join
(Yahoo! ID required)
<*> To change settings via email:
<*> To unsubscribe from this group, send an email to:
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|