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You try to unmount a device with umount /mnt/usb but get the error: umount: /mnt/usb: target is busy. What is the best way to fix this?

medium📝 Debug Q14 of 15
Linux CLI - Disk and Storage
You try to unmount a device with umount /mnt/usb but get the error: umount: /mnt/usb: target is busy. What is the best way to fix this?
AClose any open files or terminals using /mnt/usb, then try umount again.
BForce unmount with <code>umount -f /mnt/usb</code> immediately.
CReboot the system to clear the busy state.
DDelete the /mnt/usb directory and try umount again.
Step-by-Step Solution
Solution:

  1. Step 1: Understand 'target is busy' error

    This error means some process is using files or directories inside /mnt/usb, blocking unmount.

  2. Step 2: Proper fix is to close those processes

    Close open files, terminals, or programs accessing /mnt/usb, then run umount again safely.

  3. Final Answer:

    Close any open files or terminals using /mnt/usb, then try umount again. -> Option A

  4. Quick Check:

    Busy means in-use; close files before umount [OK]
Quick Trick: Close files using mount point before umount [OK]
Common Mistakes:
  • Forcing unmount without checking usage
  • Deleting mount directory instead of unmounting
  • Rebooting unnecessarily

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