Information about Double Density
Double density, often shortened DD, is a capacity designation on magnetic storage, usually floppy disks. It describes the use of an encoding (or modulation) of information, which can encode on average twice as many bits per time unit compared to single density. This is achieved by using MFM instead of FM.
Floppy disk drives have been using this method since 1978 with the introduction of the 360 KiB (MS-DOS FAT size) drives.
The early hard disks also used this encoding, but was replaced by the more efficient RLL method.
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Floppy disk drives have been using this method since 1978 with the introduction of the 360 KiB (MS-DOS FAT size) drives.
The early hard disks also used this encoding, but was replaced by the more efficient RLL method.
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Floppy Disk Drive
8 inch, 5 ¼ inch, and 3.5 inch drives
Date Invented: 1969 (8 inch), 1976 (5 ¼ inch), 1983 (3.5 inch)
Invented By: IBM team led by David Noble
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8 inch, 5 ¼ inch, and 3.5 inch drives
Date Invented: 1969 (8 inch), 1976 (5 ¼ inch), 1983 (3.5 inch)
Invented By: IBM team led by David Noble
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- For the musical use of "modulation" as a change of key, see modulation (music).
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Information is the result of processing, gathering, manipulating and organizing data in a way that adds to the knowledge of the receiver. In other words, it is the context in which data is taken.
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Encode may refer to:
ENCODE (the ENCyclopedia Of D
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- Can be related to "Code"
- Encode ApS, a Danish software company
- ENCODE, the ENCyclopedia Of DNA Elements
See also
EncodingENCODE (the ENCyclopedia Of D
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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 FM.
Early floppy disk drives used this method, but they are now obsolete.
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Early floppy disk drives used this method, but they are now obsolete.
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Modified Frequency Modulation, commonly MFM, is a line coding scheme used to encode information on most floppy disk formats, which include the floppy disk formats used in most CP/M machines as well as PCs running DOS.
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frequency modulation (FM) conveys information over a carrier wave by varying its frequency (contrast this with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant).
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Floppy Disk Drive
8 inch, 5 ¼ inch, and 3.5 inch drives
Date Invented: 1969 (8 inch), 1976 (5 ¼ inch), 1983 (3.5 inch)
Invented By: IBM team led by David Noble
Connects to:
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8 inch, 5 ¼ inch, and 3.5 inch drives
Date Invented: 1969 (8 inch), 1976 (5 ¼ inch), 1983 (3.5 inch)
Invented By: IBM team led by David Noble
Connects to:
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19th century - 20th century - 21st century
1940s 1950s 1960s - 1970s - 1980s 1990s 2000s
1975 1976 1977 - 1978 - 1979 1980 1981
Year 1978 (MCMLXXVIII
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1940s 1950s 1960s - 1970s - 1980s 1990s 2000s
1975 1976 1977 - 1978 - 1979 1980 1981
Year 1978 (MCMLXXVIII
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kibibit (a contraction of kilo binary digit) is a unit of information or computer storage, abbreviated Kibit, or sometimes Kib. (Note that the abbreviation is capitalized, while kbit is not.
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MS-DOS (short for Microsoft Disk Operating System) is an operating system commercialized by Microsoft. It was the most commonly used member of the DOS family of operating systems and was the dominant operating system for the PC compatible
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File Allocation Table (FAT) is a partially patented file system developed by Microsoft for MS-DOS and was the primary file system for consumer versions of Microsoft Windows up to and including Windows Me.
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Hard disk drive
An IBM hard disk drive with the metal cover removed. The platters are highly reflective.
Date Invented: September 13 1956
Invented By: An IBM team led by Reynold Johnson
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An IBM hard disk drive with the metal cover removed. The platters are highly reflective.
Date Invented: September 13 1956
Invented By: An IBM team led by Reynold Johnson
Connects to:
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Run Length Limited coding, or RLL coding, is a technique that is used to store data on recordable media. Specifically, RLL prevents long stretches of repeated bits from causing the signal recorded on media to not change for an excessive period, by modulating the data.
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