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Technical Notes: Hardware
Mass Storage Devices
Mass storage devices run the gamut from the fastest read/write peripheral disk drives to sequential-access tape drives. Mac OS X handles mass storage devices using a stack of drivers, each of which supports some aspect of the communication between the computer host and the device. Developers can use the BSD interface and the I/O Kit (Apple's object-oriented driver development framework) to access storage devices and their media at different layers of the stack. | 
