Handling Removable Media in Unix

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UNIX supports tools for accessing removable media such as CDROMs and floppy disks.

* mount, umount

The mount command serves to attach the filesystem found on some device to the filesystem tree. Conversely, the umount command will detach it again (it is very important to remember to do this when removing the floppy or CDROM). The file /etc/fstab contains a list of devices and the points at which they will be attached to the main filesystem:

$ cat /etc/fstab
/dev/fd0 /mnt/floppy auto rw,user,noauto 0 0
/dev/hdc /mnt/cdrom iso9660 ro,user,noauto 0 0

In this case, the mount point for the floppy drive is /mnt/floppy and the mount point for the CDROM is /mnt/cdrom. To access a floppy we can use:

$ mount /mnt/floppy
$ cd /mnt/floppy
$ ls (etc...)

To force all changed data to be written back to the floppy and to detach the floppy disk from the filesystem, we use:

$ umount /mnt/floppy

* mtools

If they are installed, the (non-standard) mtools utilities provide a convenient way of accessing DOS-formatted floppies without having to mount and unmount filesystems. You can use DOS-type commands like "mdir a:", "mcopy a:*.* .", "mformat a:", etc.