What does controlling block storage devices on USB buses do?
This feature provides the ability to set a registry key that will prevent write operations to USB block storage devices, such as memory sticks. When this registry key is enabled, the devices function only as read-only devices. You can implement this setting as part of a security strategy to prevent users from transporting data using these devices.
Who does this feature apply to?
Users who do not want data to be written from their computer to a USB storage device.
IT professionals who want to implement organization controls over the use of USB block storage devices
What settings are added or changed in Windows XP Service Pack 2
0 - Disabled
1 - Enabled