[email protected] wrote: > Hi, > > (Running Gentoo Linux on a 4.9.17 vanilla (ftp.kernel.org) Linux > kernel) > > I was doing a backyp of a 64GB SAMSUNG flash card to my > harddisk....which runs for quite a while... > > For that I mount the partitions and tarred their contents as root > to the harddisk > > Syddenly out of nothing/from nowhere/into thin air or whatever: > read errors happens and the process stops. > > First I thought of the one an most hated failure of harddisks, which > in years of deveopment of computer technology no company was able to > fix: No space left on device. > > But - no,,,the error was a _READ_ error and a 'ls' of the mountpoints > show....nothing but empty directories. > > I tried to unmount/remount the sd card and got this output: > mount: wrong fs type, bad option, bad superblock on /dev/sdb2, > missing codepage or helper program, or other error > > In some cases useful info is found in syslog - try > dmesg | tail or so. > > dmesg gives me: > [ 236.021878] UDF-fs: warning (device sdb2): udf_fill_super: No > partition found (2) > > > UDF??? -- Those partitions are either ext4 or vfat. > (A tried that with and without the -t option...) > > fdisk -l /dev/sdb gave me: > Device Boot Start End Sectors Size Id Type > /dev/sdb1 32768 73433087 73400320 35G 83 Linux > /dev/sdb2 73433088 100696063 27262976 13G 83 Linux > /dev/sdb3 100696064 125042687 24346624 11.6G 83 Linux > > So -- the partition table is still there (I had booted the PC > in between...so these are no ghosts of an abondomed cache...) > > If a certain kernel module woyld be missing I wouldn't not > able to mount the partition right before starting the backyp > - but I could. > > The partition table is there so this part of "DMESG predicts" > is also not applicable here. > > What happens here? Flash killed? Is there any chance to rescye > some or all contents of that card? Any ideas other than > hoping for an alternate reality?
You can try to recover some data with photorec (part of testdisk). Btw.: If it is a microsd card I would put it into an microsd-to-sd adapter. I made some strange experiences with different types of card readers when I used microsd cards directly without an adapter. -- Regards wabe
