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Apple PowerBook External Floppy Drive

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Macintosh HDI-20 External 1.4MB Floppy Disk Drive
PowerBook Duo with Duo MiniDock (Dpaanlka)
An external floppy drive (top right) in use with a PowerBook Duo on a Duo MiniDock (Dpaanlka, public domain)
Manufacturer Apple Computer
Type External 1.4 MB floppy disk drive
Interface HDI-20
Compatible PowerBook 100; PowerBook Duo through the Duo Floppy Adapter or Duo MiniDock
Model M8061 (order number)
Part number 661-1651 (service)
Media 3.5 in floppy disks: 400K, 800K and 1.4 MB

The Macintosh HDI-20 External 1.4MB Floppy Disk Drive is Apple's external floppy drive for the PowerBook 100 and the PowerBook Duo, neither of which has a floppy drive inside. It plugs into the HDI-20 floppy port on the back of the PowerBook 100, or on a Duo Floppy Adapter or Duo MiniDock.[1][2][3] Apple's Duo Service Source notes that the Duo uses the same drive as the PowerBook 100.[2] The Duo Dock has its own internal floppy drive and does not need it.[4]

Specifications

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HDI-20 External 1.4MB Floppy Disk Drive
Item Value
Disks 400K, 800K and 1.4 MB Macintosh disks, and MS-DOS disks[1][3]
Power (PowerBook 100 Service Source) 4.5 W at start-up, 1.25 W in random operation, 50 mW idle[5]
Order number M8061[6]
Service part number 661-1651[7]
Price (Apple Catalog, autumn 1993) US$139, catalogue item E1027[3]

The Apple Catalog described it as a low-power drive and said that, with Macintosh PC Exchange, it reads MS-DOS formatted disks.[3] Apple's October 1994 Apple Facts lists it among the PowerBook Duo accessories, and the 1993 sheet lists it as a MiniDock accessory.[8][9]

Faults

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Apple's Duo symptom charts for the external drive work outwards from the disc:[10]

External floppy drive faults (PowerBook Duo symptom charts)[10]
Symptom Action, in Apple's order
Picture and sound present, but the drive does not work Check the adapter's connection to the PowerBook; try a known-good disk; check, then replace, the drive cable; replace the floppy adapter; replace the drive; replace the logic board
Disk ejects at start-up, Mac icon with a blinking X Try a known-good system disk; check that the trackball or mouse button is not held down; drive cable; floppy adapter; drive; logic board
Disk will not eject Hold the mouse or trackball button down while switching on, or push a straightened paper clip into the hole beside the slot; drive cable; floppy adapter; drive; logic board
Initialisation fails; read, write or copy errors Known-good disk; drive cable; floppy adapter; drive

On a MiniDock the charts are the same, with the MiniDock logic board as the last step.[11] See Floppy Drive Repair for cleaning and repairing the mechanism. Take care with the flexible cables inside: one 68kMLA member broke the ribbon cable to the motor while lifting the board out of his drive.[12]

Other PowerBook external drives

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The PowerBook 2400c used its own external floppy drive, which Apple listed as the PowerBook 2400c External Floppy Drive, M5853LL/A.[13] Later PowerBooks put the floppy drive in an expansion bay module; see Apple PowerBook Expansion Bay Modules#Floppy drive modules.

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References

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  1. ↑ 1.0 1.1 Apple Computer, Tech Info Library article 8975, PowerBook: Apple Peripheral Products (7/92), absurdengineering.org library. The Macintosh PowerBook AC Adapter works in any country with a plug adapter and lets batteries be recharged away from the computer.
  2. ↑ 2.0 2.1 Apple Computer, PowerBook 200 Series Service Source, Specifications, "Disk Storage", PDF p. 18. Hosted as File:PowerBook Duo 200 Series Service Source.pdf. External 1.4 MB floppy drive, the same drive used with the PowerBook 100; requires the Duo Floppy Adapter or Duo MiniDock.
  3. ↑ 3.0 3.1 3.2 3.3 Apple Computer, The Apple Catalog, Fall 1993, PowerBook accessories, PDF p. 16, https://vintageapple.org/catalogs/pdf/The_Apple_Catalog_Fall_1993.pdf (retrieved 2026-10-04). Apple HDI-20 External 1.4MB Floppy Disk Drive, E1027, $139; low-power; PowerBook 100 and Duo docks and adapters; 400K, 800K and 1.4 MB disks and MS-DOS disks with PC Exchange.
  4. ↑ Apple Computer, PowerBook Duo Dock Service Source, Specifications, "Disk Storage", PDF p. 17. Hosted as File:PowerBook Duo Dock Service Source.pdf.
  5. ↑ Apple Computer, PowerBook 100 Service Source, Specifications, "Disk Storage", PDF p. 5. Hosted as File:PowerBook 100 Service Source.pdf.
  6. ↑ Apple Computer, Tech Info Library article 10827, Macintosh PowerBook Duo: Accessories (5/94), absurdengineering.org library. Duo AC Adapter order number M4174LL/A.
  7. ↑ Apple Computer, PowerBook 100 Service Source, Exploded View, PDF p. 116. External floppy drive 661-1651.
  8. ↑ Apple Computer, Apple Facts, October 1994, "PowerBook Duo Accessories", PDF p. 92, https://vintageapple.org/applefacts/pdf/Apple_Facts_9410_10.94_October_1994.pdf (retrieved 2026-10-04).
  9. ↑ Apple Computer, Apple Facts, February 1993, "Macintosh Duo MiniDock at a glance", accessories, PDF p. 57, https://vintageapple.org/applefacts/pdf/Apple_Facts_9302_2.93_February_1993.pdf (retrieved 2026-10-04).
  10. ↑ 10.0 10.1 Apple Computer, PowerBook 200 Series Service Source, Troubleshooting, "Symptom Charts/External Floppy Drive", PDF pp. 51–54.
  11. ↑ Apple Computer, PowerBook Duo MiniDock Service Source, Troubleshooting, "Symptom Charts/Floppy Drive", PDF pp. 27–29. Hosted as File:PowerBook Duo MiniDock Service Source.pdf.
  12. ↑ 68kMLA forum thread "HDI-20 Repair?", December 2018, https://68kmla.org/bb/threads/hdi-20-repair.32101/ (read 4 October 2026). A motor ribbon cable broken while lifting the drive's board.
  13. ↑ Apple Computer, PowerBook 2400c Service Source, Basics, "2400 Series Peripherals", PDF p. 4. Hosted as File:PowerBook 2400c Service Source.pdf.


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