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I keep getting a message like this. How might I debug / troubleshoot why this is being thrown?

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3 Answers

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You can try Unlocker to look for file locking handles on the device. This program is also very useful for deleting things that Windows won't let you delete. Use with caution; the file was probably locked for a reason at some point (whether that reason is still valid or not, on the other hand...).

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Hmm.. how do I point it at the whole drive? I've used this for nuking files and such before but it doesn't seem to want to look at the whole drive. (This also doesn't work for things that don't expose drives; e.g. phones/ipods/etc.) – Billy ONeal Nov 15 '11 at 23:07
It has added itself to the right-click menu in Windows Explorer on my XP machine. You simply right-click in the drive and choose "Unlocker". – evilspoons Nov 15 '11 at 23:10
No such luck on my box. Maybe because it's a 64 bit machine. – Billy ONeal Nov 15 '11 at 23:11
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Process Monitor should be able to tell you what files are open, and so you can filter for the files open on the removeable drive.

Go to "Filter/Filter..." in the menu, select Path from the dropdown menu, choose Begins with, then enter the path for the removable disk in the criteria field. Make sure Include is selected in the next dropdown, and click Add.

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Erm.. how do I do that? It shoes handles but I don't want to go through all 150+ processes and all the files they have open looking.... – Billy ONeal Nov 15 '11 at 22:59
I have updated my answer with more detail – Paul Nov 15 '11 at 23:29
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Check out Dev Eject. It does exactly what you want. Dev Eject shows you a list of all open files on a drive and the process that is accessing it.

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