Master Linux mount and umount with 15 practical examples

After creating partitions on a new disk with tools like fdisk or parted and formatting them with mkfs, you use the mount command to attach a filesystem to a directory and start using it.

1. Mount a CD-ROM

# mount -t iso9660 -o ro /dev/cdrom /mnt

The -o ro option mounts the CD-ROM read‑only; ensure the target directory /mnt exists before mounting.

2. View all mounted filesystems

# mount

Running mount without arguments lists every currently mounted filesystem, as shown in the example output where a USB drive ( /dev/sdb) is mounted on /media/myusb.

3. Mount everything listed in /etc/fstab

# mount -a

The -a flag reads /etc/fstab and mounts all entries that are not already active.

4. Mount a specific entry from /etc/fstab

# mount /mydata

If the directory name is supplied, mount searches /etc/fstab for a matching device and mounts it. Re‑issuing the command on an already‑mounted point yields an error indicating the device is busy.

5. List mounts of a particular filesystem type

# mount -l -t ext2
# mount -l -t ext4

This filters the mount list to show only ext2 or ext4 filesystems.

6. Mount a floppy disk

# mount /dev/fd0 /mnt
# cd /mnt

After mounting, the floppy’s contents are accessible; unmount with umount /mnt before physically removing the disk.

7. Bind‑mount a directory to a new location

# mount -B /mydata /mnt

The bind mount makes the same filesystem visible at /mnt. Changes made under either path are reflected in the other.

8. Move a mount point to a new directory

# mount -M /mydata /mnt/

The -M option relocates the existing mount tree without unmounting the original point.

9. Mount without updating /etc/mtab

# mount -n /dev/sda6 /mydata

Using -n performs the mount but does not write an entry to /etc/mtab, so the mount is invisible to mount listings that read that file.

10. Mount read‑only or read/write

# mount /dev/sda6 /mydata -r   # read‑only (same as -o ro)
# mount -t ext4 -o ro,noload /dev/sda6 /mydata   # read‑only with no journal replay

Read‑write is the default; use -w or omit -o rw for normal operation.

11. Remount an already mounted filesystem

# mount -o remount,rw /mydata

The remount option changes mount options (e.g., from read‑only to read‑write) without detaching the filesystem.

12. Mount an ISO image

# mount -t iso9660 -o loop pdf_collections.iso /mnt

The ISO file is treated as a virtual CD‑ROM and its contents become accessible under /mnt.

13. Unmount multiple mount points at once

# umount /mydata /backup

Specify several targets in a single umount command.

14. Lazy unmount

# umount -l /mydata

The -l (lazy) flag detaches the filesystem immediately but delays cleanup until all references are closed.

15. Force unmount

# umount -f /mnt

If a device is busy, -f forces the unmount; if that fails, a lazy unmount or identifying the holding process with ps or fuser can help.

Additional utilities such as df (to show disk usage), lsof, and fuser (to locate processes using a mount point) are mentioned throughout the examples.