Restore back the space of transcend pendrive

Hello,
Of late my transcend 8GB pendrive had been in a "write protection" mode. And when i have removed this mode by following the following steps:
1. Plunge the drive or memory card to a computer. (Of course, you should use a card Reader to connect your memory card.)

2. Click "Start" on the taskbar to open "Run" and type in "regedit".

3. Hit "HKEY_LOCAL_MACHINE" to expand "System".

4. Find "Current Control Set" in "System" list to click "Control".

5. Check whether there is a key named "Storage Device Policies" to change the digit in the "DWORD value" box into "0? and press "OK".

But, if you cannot find the key named "Storage Device Policies", you are supposed to create a one: right click "Control" to create a new key and name it as "Storage Device Policies"=> right click this new key to highlight "DWORD Value" and name it as "write protect"=> Double click this "write protect" box to change the number.

, from that time my pendrive shows 11.8GB space!!!
But now i want to restore back my transcend pendrive into its original space i.e. 8GB.
What should I do?