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When you are using some USB devices like USB pen drives, iPod or external hard drives, have you ever met one problem that your USB devices are not detected in the computer?

The following are some useful tips to fix such kind of problem before these USB devices are severely damaged and must require to pay to recover lost data from the chips with some professional flash data recovery tools by data recovery super heroes.

Usually, within the ability of DIY data recovery, when you think your system is not detecting pen drives, it could be a case when your computer detects your pen drive but does not show up in my computer or their system was successfully detecting USB devices, but may be after some kind of virus attack their system now does not detect any type of USB devices.

How to fix?

Due to no free drive letter has been assigned to your pen drive and your devices are not detected.

When you insert your pen drive and it gets detected very easily but it doesn’t show up as a drive icon in My Computer. The computer detects the pen drive but data on pen drive is not visible as the pen drive is not visible in My Computer (Explorer).

1. Click Start, click Run, type compmgmt.msc, and then click OK.

2. In the console tree, click Disk Management. The Disk Management window will appear.

3. On this disk management window, you can see some drives including the portable drive. Right click on your portable drive and click change drive letter and paths.

4. Now a assign a new drive letter which is not being used by any of your drives in My Computer.

5. After assigning the new drive letter your portable drive will show up in my computer with other drives

Due to wrong registry entries

After above ‘fix’ tips, if your devices are not detected as well, this could be due to wrong registry entries. i.e you need to delete UpperFilters and the LowerFilters registry values, please refer to the following tips:

1. Open Start >> Run, and type “regedit” (without double quotes), and click OK.

2. Locate UpperFilters registry value. it resides in the following registry subkey:


3. Click on Edit menu, and select Delete and click OK.
Note: If you receive an error when you try to delete the registry subkey, you may not have correct permissions to edit the subkey.

4. Locate LowerFilters registry value. It resides in the following registry subkey:


5. Click on Edit menu, and select Delete and click OK.
6. Exit Registry Editor and restart your system.

If above tips also fail to fix your problems, you need then to contact your local data recovery provider or you should upgrade yourself with professional flash data recovery tools which is able to restore flash drives and recover lost data.

Learn more about other data recovery and computer help tips.