USB Mass Storage Device Not Recognized

I have a Maxtor 3200 external drive which has been working fine with Windows 7 Home Edition.  However, today I cannot get it recognized by Windows.  It is listed in Control Panel-->Open Devices and Printers and shows "The device is working properly."  It also appears in the list on the icon ot safely shutdown devices.  But it is NOT showing in Windows Explorer so I cannot access any of the data on this Maxtor external hard drive which I need to be able to do.

When I connect a USB flash drive, Windows does recognize it.



Have you made any changes to the computer prior to this issue?


I would suggest you to try the following methods and check if it helps.

Method 1:

Run the fixit from the following Microsoft article and check if it helps.

Hardware devices are not working or are not detected in Windows:


Method 2:

Run the Hardware and Devices troubleshooter and check if it helps.

Open the Hardware and Devices troubleshooter:


Method 3:

Refer to the following Microsoft article and then change the drive letter of the external drive and check if it helps.

Change, add, or remove a drive letter:


Hope the information is helpful.

Basith M
- Forum Moderator (Multiple Forums)

23 people were helped by this reply


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Question Info

Last updated July 1, 2020 Views 39,421 Applies to: