[SOLVED] Can't reformat btrfs USB drive

[dstuart]

Hi,

So I used a USB drive to install an earlier Xbian package (I've since moved back to just using an SD card), but I've just grabbed it to reformat and use it with my Mac, and am unable to reformat it.

Terminal

root@xbian:~# sudo mount /dev/sdb1 /mnt
mount: block device /dev/sdb1 is write-protected, mounting read-only
root@xbian:~# mount -o remount,rw /dev/sdb1
mount: cannot remount block device /dev/sdb1 read-write, is write-protected

Terminal

/dev/sdb1 on /mnt type btrfs (ro,relatime,space_cache)

Anyone got any ideas to make this drive usable again?

Thanks