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This tips will usefull for if you have these mention errors on your USB Pen Drive or Memory Card or iPod.
Some times people say that suddenly their drive become write protected and they are
not able to delete any files and folder on the drive and also not able to copy new files and folder to USB portable drive.

Cannot copy files and folders, drive is write protected
Cannot format the drive, drive is write protected
The disk is write protected
Remove write protection or use another diskMedia is write protected

Let’s see how can you remove write protection on your portable devices like pen drives, memory cards, iPod and other USB mass storage devices.

How to Fix it:

Write Protection on any portable USB Device can be applied by the physical lock provided on the card adjuster or some times provided on the pen drives, so make sure to make your drive not write protected by moving the lock in right direction.

But even after moving the physical lock for write protection the problem can happen due to some virus action. This happens when some virus or script which applies the registry it make any drive write protect when connected to the computer, In that case follow the procedure below to remove write protection from your pen drive.

1. Open Start Menu >> Run, type regedit and press Enter, this will open the registry editor.

2. Navigate to the following path:>
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies

3. It will look like slimier to this

Note : If the registry key StorageDevicePolicies key does not exist, you will need to create it. Download this batch file called
"add-sdp.bat" from here, and double click after download the key will be automatically added to registry.