Single density, often shortened SD, is a capacity designation on magnetic storage, usually floppy disks. It describes the use of an encoding (or modulation) of information using Frequency modulation, also known as biphase mark code.
Early floppy disk drives used this method, but they are now obsolete. It was quickly replaced by double density floppy drives using modified frequency modulation (MFM).
Read more about Single Density: See Also
Famous quotes containing the word single:
“Tired,
she looked up the path
her lover would take
as far as her eyes could see.
On the roads,
traffic ceased
at the end of day
as night slid over the sky.
The traveller’s pained wife
took a single step towards home,
said, “Could he not have come at this instant?”
and quickly craning her neck around,
looked up the path again.”
—Amaru (c. seventh century A.D.)