> >Sector writes are atomic (ATOMIC-SECTORS) > >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > >Either whole sector is correctly written or nothing is written during > >powerfail. > > > > Unfortuantely, none of the cheap USB/SD flash cards I seen do > > behave like this, and are unsuitable for all linux filesystems > > I know. > > > > An inherent problem with using flash as a normal block > > device is that the flash erase size is bigger than > > most filesystem sector sizes. So when you request a > > write, it may erase and rewrite the next 64k, 128k, or > > even a couple megabytes on the really _big_ ones. > > > > If you lose power in the middle of that, filesystem > > won't notice that data in the "sectors" _after_ the > > one your were trying to write to got trashed. > > around, not after. the block you are reading could be in the middle or at > the end of an eraseblock. Applied, thanks. -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
