According to the MSDN web site:
http://msdn.microsoft.com/library/de...onwhatsnew.asp the feature exists:
"USB Mass Storage Function Driver
Windows CE 5.0 adds a USB Mass Storage Function driver that enables a Windows CE-based device to expose a native storage device to a USB host. For example, the Windows CE-based device can expose internal CompactFlash, hard disk, or USB Mass Storage components. The storage then appears as a USB Mass Storage device to a USB host. This enables the USB host to transfer files to and from the native storage device on the Windows CE-based device by means of USB.
For information about USB mass storage function driver registry settings, see USB Mass Storage Class Driver Registry Settings.
For information about the USB function controller driver, see USB Function Controller Drivers."
But it sure is elusive when it comes to finding this anywhere else. Good luck.