History:
USB MTP (universal serial bus - media transfer protocol) was developed
to replace the USB Mass Storage.

Problem with mass storage is that it is not reliable - it is
block-device-level protocol. And if PC goes power down (or blue
screen, on certain O.S) the data on the smartphone will be damaged,
and there is no "scandisk" on the smartphone, so it will become
unreadable.
MTP overcomes this problem by being filesystem level protocol (as
opposed to block device), and is supported since Windows
hasta-la-Vista. (since 2006)

The result:
Google decided to remove USB Mass Storage from Android 4.x devices.
Newer Android devices support MTP-only.

-- 
-Alexey Eromenko "Technologov"


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