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Since when USB drives started to be a common thing, I never could eject any USB drive properly. When I try to eject using the 'correct way' by clicking on 'eject' on the Windows taskbar, I always get the error below. No matter what USB drive is, brand, size, the only way I get to eject it is by ignoring this error message.

Is there a way to know WHAT APP or process is using the drive at the moment, to try to find out what is happening?

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ChanganAuto
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delphirules
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2 Answers2

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Event Viewer

screenshot

  • Open Event Viewer, for example in any of the following ways:
    • right click on the Start button → Event Viewer
    • or left click on the Start button → start typing "Event Viewer" → Enter
  • in the Event Viewer, go to Windows Logs → System
  • Select recent events with the event ID 225
  • Under the list of events, the path and process ID of the culprit will be shown

source

After finding out what's happening, you might want to solve the problem:

  • If the culprit is The application System with process id 4, proceed as described here.
  • Otherwise, close the culprit directly or via the Task Manager.
root
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0

Resource Monitor

You can find open file handles and disk activity in the Resource Monitor:

  • Start the Resource Monitor (for example Win+R → resmon → OK)
  • To view open file handles: CPU tab → tick the check box on the upper left to select all processes → in the Associated Handles pane, type the drive letter in question such as A:\ and click on the ⌄ button to show the list.
  • To view disk activity: Disk tab → in the Disk Activity pane, click on the File column header to sort by path, and scroll to the disk letter in question.
root
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