Unable To Lock Device. Make Sure You Do Not Have Open Files On This Device And Try Again -

lvchange -an /dev/vg_name/lv_name # deactivate LVM mdadm --stop /dev/mdX # stop RAID array

If unmount fails with “target is busy”:

The error "Unable to lock device" is essentially the operating system saying: "I tried to secure the device for ejection, but something else is currently holding the handle. If I let you pull this drive out now, that 'something else' might crash, or your data might corrupt." In the search bar, type the drive letter (e

User runs fdisk /dev/sdb and sees the error, even though mount | grep sdb shows nothing.

: Restarting your computer in a "clean boot" state (disabling non-Microsoft services) can ensure no third-party apps interfere with the device lock. Common causes include: When you see the prompt

In the search bar, type the drive letter (e.g., E: or F: ).

If it asks if you want to schedule the volume to be checked the next time the system restarts, type and hit Enter, then reboot. Method 4: Disable Third-Party Security Software In the search bar

: If the drive is external, connecting it to another PC can bypass local software or OS locks that are preventing the operation.

Common causes include:

When you see the prompt to check for open files, you might instinctively check your taskbar. But the offenders are rarely that obvious. Here are the most common causes for this error: