Cause:
This issue is caused by the two drives having identical signatures, leading to a Signature Collision. This is different from the drive's serial number, which is always unique.
Solution 1:
Normally the Operating System (OS) (Such as Windows XP and Windows Vista) will automatically correct the issue when the second drive is connected. However, in Windows 7, this does not occur. When using Windows 7, please follow the steps below to give one of the drives a new unique signature.
Critical: Follow these steps carefully. Improper use of Windows Disk Managment tool can result in permanent loss of data.
1. Connect each drive (one at a time) and create a backup of any data you may already have stored on the device.
2. Connect both drives to the computer.
3. Open the Start Menu, type diskmgmt.msc and press Enter.
4. On the lower part of the Disk Management window, look for a disk which is listed as Offline.
5. Verify that you have a Signature Collision by holding your mouse over the drive. You will receive a pop-up explaining why the drive is offline.
6. Right click on the disk in the area that says Offline, and select Online
7. The drive will be given a new signature. A new Drive Letter should appear and you should now be able to access the drive.
OR
1. Go to Computer Management --> Disk Management
2. Check the status of the drive that is plugged in but Windows 7 is not recognizing.
You may notice that is offline with a notice that reads as follows:
"The disk is offline because it has a signature collusion with another disk that is online."
3. Simply right-click the offline disk and click 'online.'
Problem should be solved!
Solution 2:
1. Go to Start Menu
2. Type Computer Management.
3. When this opens, select Storage then Disk Management.
4. Find the USB disk you are interested in.
5. Right Click on the partition, select Change Drive Letter and Path...
6. Pick an available letter.
7. Repeat steps 4 to 6 for each disk/partition.
Solution 3:
01. Plug in and turn on the external USB hard drive
02. Right click on My Computer
03. Left click on Manage
04. Left click on Device Manager
05. Expand the USB list
06. Find the USB device for your USB Hard Drive (in my case it was the one that had no description)
07. Right click - Uninstall
08. Turn off the external USB hard drive
09. Turn on the external USB hard drive and let it find and install the driver
10. It should work
References:
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