Re: Have ext3 on SanDisk CF but can't disable write-back caching as kernel instructs
From: Michael Schnell (mschnell_at_lumino.de)
Date: 07/14/03
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Date: Mon, 14 Jul 2003 08:24:36 +0200
> The hardware is pretty much fixed at this point (we've already gone
> through initial "qual-testing", for instance). We definitely won't be
> able to change the design to use a hard drive rather than a CF disk,
> and even if we were able to, I can't imagine a HD being more reliable
> in this application than a solid-state disk.
>
A harddisk has no limitation on the count of rewrites of any sector. The
CF cards has (though its complicated and well hidden). So this is not a
case of reliability but of specification. If you want to use a CF card
for some kind of application that permanently rewrites some data you
will quickly destroy it. There is a file system for linux that is
written exactly for the purpose of using Flash in the best possible way,
but it only works correctly with naked flash chips and can't be updated
for CF cards, as there is no specification how exactly the CF card
handles the "spreading" of data, and supposedly it's different for
different brands.
-Michael
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