Look at pictures above you will see the different, these pictures I focus on device "Disk drives", on left side, Disk drives in Device Manager show only the active devices that attaching to my computer and the right picture show all devices including hidden devices that use to be used on my computer, I've use this computer about 5 years ago so you will see many disk drive on my device manager.
This tip doesn't work only on disk drive but works on all device, for me when i show all hidden devices it show all my display adapters, modems and network adapters that use to attach on this computer(don't show in picture above).
To enable this tip, you have to set Environment Variable. Begin by open System Properties (right click on My Computer), go to Advances tab and click on Environment Variables , in Show User Variables click New and set Variable name to "devmgr_show_nonpresent_devices=1", click OK to confirm your change, then try to open your device manager, for now you may not see any change until you select View->Show hidden devices, if you tick on View->Show hidden devices before set Environment variable, it will not show all hidden devices, try it to prove what i say is true, with this easy steps you can see all devices that use to be used on your machine.
If you don't want to permanent enable it, you can set "devmgr_show_nonpresent_devices=1" in command line and call device manager by type compmgmt.msc, it will temporarily enable this tip, on your next boot it will return to default.
Hope you may get some benefit, more or less!
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