One of the annoying window message is while safely remove a memorystick or external harddrive that windows gives you a popup with ” acces denied, cannot delete, used by another person or program, here has been a sharing violation.
The source or destination file may be in use, The file is in use by another program or user, Make sure the disk is not full or write-protected and that the file is not currently in use”.

Unlocker is a handy tool to see what or who is in blocking your activity. You can easily see what program or situation is currently using that thing (memoystick, harddrive, folder, etc…). See image below.

There are similar tools out there and I’m not going to say unlocker is better or the best. But unlocker does the job that I expect. So,  many thanks to the creator for extending my memorystick life by  safely removing my memorystick much more easier.

Source: unlocker