Disk II Floppy Disk Subsystem
The Disk II Floppy Disk Subsystem, introduced in 1978, was a groundbreaking peripheral for Apple II computers. Designed by Steve Wozniak, it was the first affordable and efficient floppy disk system for personal computers, allowing users to store and retrieve data quickly and reliably. The Disk II’s compact and efficient design made it a critical component in the success of the Apple II, contributing to its widespread adoption in homes, schools, and businesses. It provided users with a practical and powerful tool for managing software and data, enhancing the usability of the Apple II.
Technical Characteristics
Storage Devices
A2M0003
5.25-inch floppy disk drive
140 KB per disk (single-sided, single-density)
15.7 KB per second
1000 milliseconds average seek time
Proprietary Disk II controller card (connects to Apple II series computers)
Soft-sectored, single-sided floppy disks
Shugart Associates 5.25-inch floppy drive mechanism adapted by Steve Wozniak for Apple
Compatible with Apple II, Apple II+, Apple IIe, and Apple IIc (via built-in connector for IIc)
External power adapter
2.7 kg
Height: 114 mm, Width: 152 mm, Depth: 229 mm