Cant format external drive

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http://unix.stackexchange.com – I am trying to format an external drive, but getting the error /dev/sdb1 is apparently in use by the system; will not make a filesystem here! Based on the internet, I have: run cat /proc/mounts: /dev/sda3 /media/backup fusebl w,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096 0 0 /dev/sdc1 /media/movies ext3 rw,relatime,user_xattr,barrier=1,nodelalloc,data=ordered 0 0 ran mount: /dev/sda3 on /media/backup type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096) /dev/sdc1 on /media/movies type ext3 ( (HowTos)