Removable media has come a long way since my first computer, which had a pair of 5 ¼” floppy drives. The 3 ½” floppy was out then, but was new and wouldn't become popular for a year or two, and wouldn't be the standard removable media for several years. The CD had been for music only for some time before we started seeing CD Drives on PCs, and even though CDs are gradually being replaced by DVDs, the 3.5” floppy is still around. A few other removable mediums have been tried. The early Home Computers used cassette tapes. The mini-disk really didn't fly, though I do occasionally see them for drivers, mostly to keep the packaging for the hardware smaller. The first floppy I used was similar to the 5 ½”, but it was 10”, I think. The latest trend in removable media is the thumb or flash drive, and they are being made in sizes up to 32gb.
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Review: OCIA