Pentax K-X - Manual (Page 268)

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10
1
Turn your computer on.
2
Turn off your camera and use the provided USB cable to
connect your camera and your computer.
Saving Images by Connecting Your Camera
and Your Computer
MSC and PTP
MSC (Mass Storage Class)
A general-purpose driver program that handles devices connected to
the computer via USB as a memory device. Also indicates a standard
for controlling USB devices with this driver.
By simply connecting a device that supports USB Mass Storage
Class, you can copy, read, and write files from a computer without
installing a dedicated driver.
PTP (Picture Transfer Protocol)
A protocol that allows transfer of digital images and control of digital
cameras via USB, standardized as ISO 15740.
You can transfer image data between devices that support PTP
without installing a device driver.
Unless otherwise specified, select MSC when connecting the a
to your computer.