On Apr 27, 2010, at 12:18 PM, hartonj wrote:
Maybe if this person (http://floppydisks.com/) actually still sells
them, he'll keep selling them still. They claim to sell 5 1/4 disks
too!
The original IBM floppy disks were 8".
These are still available (usually factory formatted for an IBM 3470,
or equivalent) as these are employed to store microcode and
configuration information on some IBM devices.
The original 8" floppy was single-sided and FM-encoded. Stored 240 KB.
The double-sided floppy stored twice that, of course.
The improved 8" floppy was double-sided and MFM-encoded. Stored 1.2
MB on its 77 tracks. By convention, side 0 cylinder 0 was FM-encoded
("single density"), but all other tracks were MFM-encoded ("double
density").
A normal 5-1/4" floppy was 40 tracks. Both single- and double-sided
versions were made.
A 5-1/4" 80 track double-sided floppy ("quad density") could store a
bit more than 1.2 MB.
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