Disk II

At A Glance

Apple Disk II

The Apple Disk II was the first external storage device built for the Apple II and increased the capabilities of the Apple II computer through the use of flexible, or “floppy” disks for data storage with a capacity of up to 140K per disk. It required a separate controller card which allowed for up to two drives per controller to be supported.

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Original Specifications

  • Format:
    • Sectoring: soft (hard-sectored disks may be used)
    • Recording surfaces: 1
    • Tracks per surface: 35
    • Sectors per track: 16
    • Bytes per sector: 256
  • Capacity:
    • Formatted data capacity: 140K, 16-sector (with Pascal & DOS 3.3)
    • Available data capacity: 137K with Pascal and 124K under DOS (both 16-sector)

  • Characteristics:
    • Head movement time: 25 msec (track to track) and 600 msec (across all tracks)
    • Head load time: 50 msec
    • Average rotational delay: 100 msec.
  • Packaging:
    • Controller: PC board that plugs into one of the Apple II’s eight expansion slots
    • Drivers per controller: 2
    • Drive dimensions:
      • Height: 3.25 inch (8.3 cm)
      • Width: 5.75 inch (14.6 cm)
      • Depth: 8.0 inch (20.3 cm)
      • Weight: 3.0 lb (1.36 kg)

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Apple 2 History

The Apple 2 History website is a great resource for all things Apple II, including deep background on the Disk II.

Vectronics Apple World

Check out the Disk II along with multiple other Apple storage devices at Vectronics Apple World.
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