The original motivation behind the project was a desire to interface with some type of real world device. Since one of the clear limitations of the Atmel chipset is the lack of storage space, it would be useful if it could connect to some type of mass media storage device. Implementing a SCSI interface would allow it to connect to virtually any type of storage device - hard drives, CD-ROM drives, and various removable media.
Link : The zip Drive and Digital Camera using ATmega8535
Link : The zip Drive and Digital Camera using ATmega8535