billwill
Tuesday 8th July 2008 10:31pm [Edited]
North London
6,162 posts
The first floppy disk that I saw was about 30 inches diameter, back in the '70s. It was a storage device for a prototype computer-terminal that was capable of speaking short phrases.the disk floated over a thick aluminium disk with jets of air to make the floppy float.
The device was so delicate & so valuable that it had to have its own airline seat when it was transported to computer conferences.
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But for the floppy disks that you know of.
The first ones were 8 inch diameter, the disk being inside a flexible cardboard/plastic case lined with slippery material so that the disk could spin inside the case, which FREAKED me out as that was a CRAZZZY idea (clearly you could not spin anything with so much friction, withour ripping the floppy disk itself). These original floppies (officially called diskettes) were invented by IBM computer engineers for the purpose of holding diagnostic programs for IBM mainframe computers. I guess they were fed up with carrying stacks of punched cards around. These big floppies were adopted by the early micro-computers (1978-1983) as the only practical cheapish storage device around.
The around 1980 came the new smaller floppy disk drive which used almost exactly the same technology, but with disks of only 5 inches diameter inside the slippery flexible case. As a much more convenient size these rapidly took over from 8 inch floppies. However there were many different formats, hard sectored, soft-sectored, single sided, double-sided, low density & high density. And every diferent kind of CP/M microcomputer formatted them in a different way.
When IBM released the IBM PC, such was the prestige of the IBM name & reputation, that almost all the other manufacturers of computers fell in line and made their floppies compatible with those of IBM and a lot of the chaos subsided.
Then came the 3.5 inch floppy, with which you all are probably more familiar, this has a floppy disk inside a RIGID plastic case, but still lined with slippery stuff so that the disk can spin inside. These came in just a few variants and the formatting was almost all IBM compatible (except Apple Macs).
Nowadays, floppies have been ousted by writable CDs/DVDs and with solid memory USB sticks, so most modern computers do not include a floppy disk drive.
IT engineers like me, still need them sometimes to cope with oddball situations, & some of the Windows server software still needs a floppy disk drive to do a sort of key-disk for a complete backup.