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Why do I get device is busy when unmounting a CD-ROM?

April 26, 2017busy CD-ROM device unmounting

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Why do I get device is busy when unmounting a CD-ROM?

2 Answers

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The disc cannot be unmounted if any processes are accessing the drive, including having their default directory set to the mounted filesystem. If you cannot identify the processes using the disc, you can use the fuser command, as shown in the following example.

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The disc cannot be unmounted if any processes are accessing the drive, including having their default directory set to the mounted filesystem. If you cannot identify the processes using the disc, you can use the fuser command, as shown in the following example. % umount /cdrom umount: /dev/hdd: device is busy % fuser -v /cdrom USER PID ACCESS COMMAND /mnt/cdrom tranter 133 ..c.. bash On some systems you may need to be root when running the fuser command in order to see the processes of other users.