How to remove write protection from a 4GB pqi USB flash drive?

Follow the below steps:

Go to device manager>Universal Bus Controller>Remove all items.
THEN go to driver>uninstall>click ok>delete devices under the universal bus controller and then reboot the system.

Afterwards connect your Usb drive and check it is showing or not....

you cant
if you want to get the maximun ammount of storage space create a folder or add files to a zip file to compress them
to make a folder right click in the drive select new folder and name it

hope this helps

Possibility
Firmware flash drive corrupted (the disk is write protected).

Solution
To repair damage to the firmware, the solution can be found on google seach engines. Example; Fix transcend flash drive, Fix sandisk flash drive, Fix PQI flash drive, etc.

you can use recovery tools for your flash drive.. then when you recover all the data try to format you flash drive..

format it using a low level format, and then just recover your data using a third party software recovery tool.

Format the whole disk

i dont know contact you service

solution 1 .use the lifetime wty. solution 2 .try to enter command prompt and and type in e:\ press enter that is if your only running one drive(c:\) and a dvd\cd(d:\) if not it will be the next letter. hope it helps. personaly i would go with solution 1.

neved alapj?n ?rteni fogod magyarul is, legal?bbis rem?lem.
az a probl?ma, hogy win7 driver egyel?re nem l?tezik az eszk?zh?z (a gy?rt? nem is ?rja, hogy t?mogatn? ezt az op-rendszert. a (nem t?l eleg?ns) megold?s az, hogy haszn?lat ut?n el kell t?vol?tani el?sz?r a pendrive-ot, majd az eg?sz usb-hubot a rendszerb?l (term?szetesen csak szoftveresen: device managerben uninstall), majd ezek ut?n ?jrabootolni. ekkor a win7 ?j hardverk?nt felismeri a hubot ?s az ezek ut?n ehhez csatlakoztatott pqi u273-ast is. persze ism?t csak egyszer...

http://www.pqi.com.tw/faq_1.asp?ID=1579

if you already tried different computers, and checked if the USB port is a known good port, then it might be your USB flash drive thats having problems. Check if your flash drive has lifetime warranty thru PQi's website...you might be able to get that 1 replaced..

Hope it helps..