Media Transfer Protocol (MTP) is a new protocol and accompanying set of drivers developed by Microsoft to connect portable devices to a Windows XP PC and synchronize digital media content between those devices and the PC. MTP is geared toward portable devices with hard drives; flash-based devices will continue to use Mass Storage Class (MSC), a broadly supported protocol whose drivers are already included with Windows XP, 2000, and ME. In general, users will have to buy new devices that support MTP, although some existing devices will be upgradeable.
Benefits of MTP
Driverless installation: All MTP-compatible devices use drivers that Microsoft is shipping with Windows Media Player and there is no need for users to install additional drivers for the device.
Auto synchronization: All MTP-compatible devices will support a new feature called Auto Sync, which lets users configure Windows Media Player to automatically transfer all newly acquired or ripped content to a device whenever it's connected.
Understand device limitations: MTP allows the PC to recognize a device's limitations, such as capacity or lack of support for certain file types. As new content is added to the PC, the Player will automatically transcode it.
Bidirectional file property synchronization: Changes made to file properties (such as a user rating) on a device cannot be propagated back to the PC when the device is reconnected. MTP-compatible devices will not have this limitation.
Support Windows Media Player DRM: MTP is necessary to support Microsoft's latest DRM scheme, which enables new scenarios, such as transferring subscription-based content to portable devices.