Storage
PTP does not specify a way for objects to be stored – it is a communication protocol. Nor does it specify a transport layer. However, it is designed to support existing standards, such as Exif, TIFF/EP, DCF, and DPOF, and is commonly implemented over the USB and FireWire transport layers.
Images on digital cameras are generally stored as files on a mass storage device, such as a memory card, which is formatted with a file system, most commonly FAT12, FAT16 or FAT32, which may be laid out as per the Design rule for Camera File system (DCF) specification. However, none of these are required, as PTP abstracts from the underlying representation.
By contrast, if a camera is mounted via USB MSC, the physical file system and layout are exposed to the user.
Read more about this topic: Picture Transfer Protocol
Famous quotes containing the word storage:
“Many of our houses, both public and private, with their almost innumerable apartments, their huge halls and their cellars for the storage of wines and other munitions of peace, appear to me extravagantly large for their inhabitants. They are so vast and magnificent that the latter seem to be only vermin which infest them.”
—Henry David Thoreau (1817–1862)