Apple double-density 3 1/2" disk
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== Links == | == Links == | ||
* [http://retro.icequake.net/apple2pc.html Apple-to-PC disk transfer info] | * [http://retro.icequake.net/apple2pc.html Apple-to-PC disk transfer info] | ||
| + | * [http://www.textfiles.com/uploads/apple2gscracks.txt Apple IIgs cracks] | ||
[[Category:Apple II series]] | [[Category:Apple II series]] | ||
[[Category:Macintosh]] | [[Category:Macintosh]] | ||
Revision as of 13:54, 13 February 2014
The Apple double-density 3 1/2" disk was used on the Macintosh (with the MFS or HFS file system) and the Apple II line (with the ProDOS file system). It was a disk format with 80 tracks per side and a variable 8 to 12 sectors per track, with each sector storing 512 bytes. When used in single-sided mode, its capacity was 400 kilobytes; this became 800 in double-sided mode. Data was encoded using a form of GCR encoding. The drive ran at constant linear velocity (CLV), meaning that the RPM rate varied depending on which track was being read.
3 1/2" disks are actually 90 mm wide, but are almost universally referred to as "3 1/2 inch" disks even in countries that use the metric system.
