Disk III


At A Glance

The Apple Disk III was designed to expand the Apple ///’s capacity with a reliable disk storage subsystem offering up to 560Kb of storage capacity. Up to three Apple Disk IIIs could be daisy chained together on a single Apple ///.

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Original Specifications


  • Format:
    • Sectoring: Soft (hard-sectored diskettes also supported)
    • Recording surfaces: One
    • Tracks per surface: 35
    • Sectors per track: 16
    • Bytes per sector: 256
  • Capacity:
    • Formatted Data Capacity: 140K bytes


  • Characteristics:
    • Head Movement Time: Track to track: 25 msec. Across all tracks: 600 msec
    • Head load time: 50 msec
    • Average rotational delay: 100 msec
    • Data transfer rate: 125K bits per second
  • Packaging:
    • Dimensions: 4.12″ H x 6.35″ W x 8.8″ D
    • Weight: 3 lbs (1.36 kg)
    • Power source: Apple /// system power supply
    • Model No: A3M0004



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