I had a USB drive mounted on
/dev/sdb1 and I want to reformat from NTFS to ext3. I did
umount -l which unmounted the disk. I deleted the old partition using
cfdisk. I ran
mkfs.ext3, but got the error:
/dev/sdb1 is apparently in use...
After googling I tried to
cat /proc/mounts and found it there:
How do I remove the reference from there? How did it get there? More specifically what can I run to "really umount"?