David wrote: > On Fri, 12 Mar 2021 at 20:17, Victor Sudakov <v...@sibptus.ru> wrote: > > deloptes wrote: > > > > > "wipefs -t btrfs -f -a /dev/nvme1n1" did the job. > > > > > Still wondering where those labels are stored on disk in Linux. > > > > FS Superblock? > > > Well, the FS (btrfs in this case) was not there already, but the magic > > label was still there somewhere. > > My new knowledge after 5 seconds of searching, ... > > https://en.wikipedia.org/wiki/Btrfs#Superblock > says that there are multiple copies of the superblock.
Many filesystems have multiple copies of the superblock (e.g. UFS and ext*). What surprised and worried me is the fact that they persisted after the disk was converted to ZFS, and btrfs continued to recognize this filesystem as its own (albeit unmounted). > > And the on-disk format is here: > https://btrfs.wiki.kernel.org/index.php/On-disk_Format > > And maybe if the drive was once part of a multiple > device filesystem it might be referenced in superblocks > on other devices. > No, it was not. -- Victor Sudakov VAS4-RIPE http://vas.tomsk.ru/ 2:5005/49@fidonet
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