Hi! >>> for flash drives the danger is very straightforward (although even then >>> you have to note that it depends heavily on the firmware of the device, >>> some will loose lots of data, some won't loose any) >> >> I have not seen one that works :-(. > > so let's get broader testing (including testing the SSDs as well as the > thumb drives) If someone can do ssd test -- yes that would be interesting. >> Anyway, you wanted a test, and one is attached. It normally takes like >> 4 unplugs to uncover problems. > > Ok, help me understand this. > > I copy these two files to a system, change them to point at the correct > device, run them and unplug the drive while it's running. Yep. > when I plug the device back in, how do I tell if it lost something > unexpected? since you are writing from urandom I have no idea what data > _should_ be on the drive, so how can I detect that a data block has been > corrupted? I have mirror on disk you are not unplugging. See cmp || exit lines. The test continues until it detects corruption. Pavel -- (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-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
