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Concept
Media Transfer Protocol
Summary
The Media Transfer Protocol (MTP) is an extension to the Picture Transfer Protocol (PTP) communications protocol that allows media files to be transferred automatically to and from portable devices. Whereas PTP was designed for downloading photographs from digital cameras, Media Transfer Protocol allows the transfer of music files on digital audio players and media files on portable media players, as well as personal information on personal digital assistants. MTP is a key part of WMDRM10-PD, a digital rights management (DRM) service for the Windows Media platform. In 2011, it became the standard method to transfer files to and from Android.
MTP is part of the "Windows Media" framework and thus closely related to Windows Media Player. Versions of the Microsoft Windows operating system from Windows XP SP2 support MTP. Windows XP requires Windows Media Player 10 or higher; later Windows versions have built-in support. Microsoft has made an MTP Porting Kit available for older versions of Windows back to Windows 98.
The USB Implementers Forum device working group standardized MTP as a full-fledged Universal Serial Bus (USB) device class in May 2008. Since then MTP is an official extension to PTP and shares the same class code.
MTP is a high level protocol, as opposed to a general storage protocol like USB mass storage. That means that the MTP client (computer) does not see an array of byte blocks that makes up a data structure that makes up a , but instead speaks in terms of files and folders to the MTP device. This lets the MTP device take part in the high level operations (such as updating its metadata indexes) while keeping the integrity of its file system in its own hands. In particular, dropped transfers (such as by unplugging the USB cable too soon) do not corrupt the device file system. The non-generality of MTP has consequences for how a computer operating system can present the MTP device, both to other programs and to the user.
According to its specification, the main purpose of MTP is to facilitate communication between media devices with transient connection.
Official source
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