Enabling & disabling the USB port in windows via registry.

To disable the access to USB port, in windows XP and 2000:

1. Click Start, and then click Run.

2. In the Open box, type regedit, and then click OK.

3. Locate, and then click the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\

Services\UsbStor

4. In the right pane, double-click Start.

5. In the Value data box, type 4, click Hexadecimal

(if it is not already selected), and then click OK.

6. Quit Registry Editor.

To re-enable a disabled port:

1. Click Start, and then click Run.

2. In the Open box, type regedit, and then click OK.

3. Locate, and then click the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\

Services\UsbStor

4. In the right pane, double-click Start.

5. In the Value data box, type 3, click Hexadecimal

(if it is not already selected), and then click OK.

6. Quit Registry Editor.

How to remove write Protection from extenal device /USB

1. Click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. Locate, and then click the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies
4. In the right pane, double-click on write protect .
5. In the Value data box, type 0
6. Quit Registry Editor.

Restart the computer