[root@localhost etc]# mount
/dev/hdb3 on / type ext3 (rw,relatime)
none on /proc type proc (rw)
/dev/sda1 on /mnt/win_c2 type fuseblk (ro)
[root@localhost etc]# umount /dev/sda1
umount: /mnt/win_c2: устройство занято
umount: /mnt/win_c2: устройство занято