<hardware, storage> (Or "floppy", "diskette") A small, portable plastic
disk coated in a magnetisable substance used for storing computer data, readable
by a computer with a floppy disk drive. The physical size of disks has shrunk
from the early 8 inch, to 5 1/4 inch ("minifloppy") to 3 1/2 inch
("microfloppy") while the data capacity has risen.
These disks are known as "floppy" disks (or diskettes) because the disk is
flexible and the read/write head is in physical contact with the surface of the
disk in contrast to "hard disks" (or winchesters) which are rigid and rely on a
small fixed gap between the disk surface and the heads. Floppies may be either
single-sided or double-sided.
3.5 inch floppies are less floppy than the larger disks because they come in a
stiff plastic "envelope" or case, hence the alternative names "stiffy" or
"crunchy" sometimes used to distinguish them from the floppier kind.
The following formats are used on IBM PCs and elsewhere:
Capacity Density Width
360K double 5.25"
720K double 3.5"
1.2M high 5.25"
1.44M high 3.5"
Double denisty and high density are usually abbreviated DD and HD. HD 3.5
inch disks have a second hole in the envelope and an
overlapping "HD" logo.
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