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How can I identify what application is using the file?

Often when I try to eject my external USB hard disk, I get this message:

Problem Ejecting USB Mass Storage Device

This device is currently in use. Close any programs or windows that might be using the device, and then try again.

How do I find out what the device in currently in use by?

(I’ve already tried Unlocker, it always says “No locking handle found.”)

marked as duplicate by slhck Jul 29 '12 at 18:50

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Process Explorer should work. just hit Ctrl+F and type in the name of the file. It should show all programs that are using that file.

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