On 24/09/18 1:20 AM, Richard Owlett wrote: > root@debian8-6:/home/richard# # force UID/GID to 'richard', label > device, accept standard defaults > root@debian8-6:/home/richard# mkfs.ext4 root_owner=1000:1000 -L > 2018Sept23tst1 /dev/sdb1 > mke2fs 1.42.12 (29-Aug-2014) > mkfs.ext4: invalid blocks '/dev/sdb1' on device 'root_owner=1000:1000' In addition to trying to create a filesystem on a partition that doesn't yet exist, as others have said, a quick glance at that error message suggests you're putting your options in the wrong places. The man page suggests you probably want: mkfs.ext4 -E root_owner=1000:1000 -L 2018Sept23tst1 /dev/sdb1 (once you've created /dev/sdb1) Note the -E for extended options. Richard
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