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Filesystem for SD cards?


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Himanshu Chauhan
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Since: Jun 19, 2006
Posts: 17



PostPosted: Mon Aug 06, 2007 2:11 am    Post subject: Filesystem for SD cards?
Archived from groups: comp>os>linux>embedded (more info?)

Dear all,

Which file system is best for SDCard? For me recovery after hard
shutdown/reboot is most important. Thats why currently I am using Ext3.
Which other filesystem on linux can provide such reliability and also
count on wear levelling through fewer writes on the card? I think Ext3
writes journalling information quite frequently.

Regards
--Himanshu
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Michael Schnell
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Since: Feb 08, 2005
Posts: 228



PostPosted: Mon Aug 06, 2007 8:51 am    Post subject: Re: Filesystem for SD cards? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

> Which file system is best for SDCard? For me recovery after hard
> shutdown/reboot is most important.

It has been discussed several times in this forum:

With CF/SD-cards recovery from power fail can't be improved by choosing
any file system.

The card itself does some housekeeping at unforeseeable times for an
unforeseeable duration after a write request. If power is lost during
that period, not only /some/ data is lost, but the card can get
unaccessible for good and can only be recovered by a low level
formatting that often can be done only by the manufacturer.

There is not even _any_ documentation about the power fail behavior of
such cards is available from the manufacturers. They are simply not
meant for being used in critical applications.


-Michael
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