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[root@study ~]# mount /dev/sr0 /data/cdrom
[root@study ~]# cd /data/cdrom
[root@study cdrom]# umount /data/cdrom
umount: /data/cdrom: target is busy.(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
[root@study cdrom]# cd /
[root@study /]# umount /data/cdrom