Comment # 1 on bug 914883 from Olaf Hering

root@optiplex:/ #  time env -i /sbin/mke2fs -j -L WD20_SL12 -b 1024 -m 1
/dev/disk/by-label/WD20_SL12
mke2fs 1.42.12 (29-Aug-2014)
/dev/disk/by-label/WD20_SL12 contains a ext3 file system labelled 'WD20_SL12'
        last mounted on /WD20_SL12 on Tue Jan 27 09:01:44 2015
Proceed anyway? (y,n)