Single density

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) or group code recording (GCR).

单词	Single density
释义	Single density 英语百科 Single density 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) or group code recording (GCR).
随便看	Cross post Crosspost cross posted crossposted crossposter crossposters Cross posting Crossposting cross posts crossposts cross potentiation cross power crosspower cross power density spectrum crosspower spectrum cross power spectrum cross pregnancy Cross presentation Cross price elasticity crossprime Cross Priming cross prism cross prisms cross probe Cross processing