On Sat, 2008-10-18 at 12:49 +0100, Jamie Lokier wrote: > Can you use a journalling filesystem like ext3, reiserfs, xfs, or even > UBIFS on the card, or does it have to be FAT? With a journalling > filesystem, they vary on the details but basically if you can finish > the current write request in progress, there's no fs-level corruption.
Careful. When you use a solid state "disk", you're actually using your file system on top of an underlying "pseudo-filesystem" which makes the flash pretend to be a disk. Your data are at the mercy of that underlying code, which in our past experience always seem to have been implemented by the same crack-smoking hobos they drag in off the street to write PC BIOSes. However good your own journalling file system on _top_ of that 'disk' is, you can still lose everything with a badly timed power-off. If you want to store data on solid state media, my current advice is either to do it on _real_ flash directly with a flash-based file system like JFFS2 or UBIFS, or to pray regularly to the deity of your choice. -- dwmw2 -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
