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From Alesis:

The DATADISK is a real-time MIDI data storage and retrieval unit capable of storing 800K bytes of data onto a 3 1/2" floppy diskette. Unlike similar units which store data to a large RAM (Random Access Memory) buffer before processing, data in DATADISK is stored and retrieved directly from disk so there is no waiting for large RAM buffers to fill. The disk functions are used to transfer data between the disk drive and MIDI. Because the disk size is fixed, data can not exceed 800K bytes. Each disk can hold 53 MIDI data files, but the total size of the data cannot exceed the maximum disk size, or 800K. As an additional benefit, DATADISK is universal in that it will read virtually all manufacturers system exclusive data without updating software. A large 16 character by 2 line LCD display is fitted to make the functions and operations faster, easier, and less cryptic.

Features:

—Instantly expands memory of any synthesizer or sequencer, drum machine, or effects processor —Easier, safer, and faster than tape backup —Will store MIDI System Exclusive data from virtually any manufacturer —Uses standard 3 1/2" floppy diskettes —Stores up to 800K of data per disk —SEND ALL command allows sending stored data to all MIDI devices in your systems at once