On 01/06/2013 05:26 PM, Goffredo Baroncelli wrote: > Hi Chris [...] > > I will start to update the wiki; then I will give a look to wipefs to > improve it. Hello I updated the wiki page: https://btrfs.wiki.kernel.org/index.php/Problem_FAQ#What_if_I_don.27t_have_wipefs_at_hand.3F ----- What if I don't have wipefs at hand? There are three superblocks: the first one is located at 64K, the second one at 64M, the third one at 256GB. The following lines reset the magic string on all the three superblocks # dd if=/dev/zero bs=1 count=8 of=/dev/sda seek=$((64*1024+64)) # dd if=/dev/zero bs=1 count=8 of=/dev/sda seek=$((64*1024*1024+64)) # dd if=/dev/zero bs=1 count=8 of=/dev/sda seek=$((256*1024*1024*1024+64)) If you want to restore the superblocks magic string, # echo "_BHRfS_M" | dd bs=1 count=8 of=/dev/sda seek=$((64*1024+64)) # echo "_BHRfS_M" | dd bs=1 count=8 of=/dev/sda seek=$((64*1024*1024+64)) # echo "_BHRfS_M" | dd bs=1 count=8 of=/dev/sda seek=$((256*1024*1024*1024+64)) ------ > > BR > G.Baroncelli -- gpg @keyserver.linux.it: Goffredo Baroncelli (kreijackATinwind.it> Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
