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Picture Transfer Protocol
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==Storage== PTP does not specify a way for objects to be stored β it is a communication protocol. Nor does it specify a transport layer. However, it is designed to support existing standards, such as [[Exchangeable image file format|Exif]], [[Tag Image File Format / Electronic Photography|TIFF/EP]], [[Design rule for Camera File system|DCF]], and [[Digital Print Order Format|DPOF]], and is commonly implemented over the [[Universal Serial Bus|USB]] and [[IEEE 1394 interface|FireWire]] transport layers. Images on digital cameras are generally stored as files on a [[Mass storage|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. But none of these are required as PTP abstracts from the underlying representation. By contrast, if a camera is mounted via [[USB mass-storage device class|USB MSC]], the physical file system and layout are exposed to the user.
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