Hallo, Florian,
Du meintest am 05.08.12:
> I was playing with btrfs and accidentally formatted the disk directly
> (/dev/sdb instead of sdb1). Since then I rewrote the GPT partition
> table, recreated the partition and ran btrfs device scan. Still,
> btrfs filesystem show prints:
> root@horus /mnt # btrfs fi sh --all-devices
> failed to read /dev/sr0: No medium found
> Label: 'test' uuid: ffab72f2-eff1-4ac8-a694-d56dd84fda24
> Total devices 1 FS bytes used 28.00KB
> devid 1 size 2.73TB used 2.04GB path /dev/sdb
> Label: 'home' uuid: c465d715-098a-4d0d-bebc-6aa51f4cb349
> Total devices 1 FS bytes used 28.00KB
> devid 1 size 2.73TB used 2.04GB path /dev/sdb1
"formatting" leaves most bytes on the disk untouched. If you really want
to use only /dev/sdb (or only /dev/sdb1) then you should first fill many
bytes at the beginning of the disk with zeros.
Some months ago someone had told the minimum; I have forgotten this
value. But something like
dd if=/dev/zero of=/dev/sdb bs=1M count=10
should do the job.
And then "mkfs.btrfs" creates the (only) wanted partition(s).
Viele Gruesse!
Helmut
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