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Storage density for magnetic disks
Disk density is a capacity designation on magnetic storage, usually floppy disks. Each designation describes a set of characteristics that can affect the
Disk_density
Removable disk storage medium
A floppy disk, diskette, or floppy diskette is a type of disk storage made from a thin, flexible disk coated with a magnetic storage medium. It is enclosed
Floppy_disk
floppy disk controller to read (appearing as one 5632-byte physical sector per track). Format used by rare third-party drives with quad density disks; such
List_of_floppy_disk_formats
Electro-mechanical data storage device
A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical computer data storage device that stores and retrieves digital data
Hard_disk_drive
A floppy disk is a disk storage medium composed of a thin and flexible magnetic storage medium encased in a rectangular plastic carrier. It is read and
History_of_the_floppy_disk
Theory of structure of spiral galaxies
stars in the galactic disk orbit at varying speeds, which depend on their distance to the galaxy center. The presence of spiral density waves in galaxies
Density_wave_theory
Circuitry that controls reading from and writing to a computer's floppy disk drive
the drive's on-disk format using one of a number of encoding schemes, like FM encoding (single density) or MFM encoding (double density), and reading those
Floppy_disk_controller
Computer storage measure
higher densities than hard disk drives, but hard disk drives have since advanced much more quickly and eclipsed optical media in both areal density and capacity
Density_(computer_storage)
Ecological concept; intake rate of a consumer as a function of food density
participants collected disks from a board of increasing disk density. Thus, the resulting formulae are often referred to as Holling's Disk Equations. The type
Functional_response
high density Macintosh format disks. dd (Unix) Disk image Disk storage Don't Copy That Floppy Floppy disk controller Floppy disk format Floppy disk hardware
Floppy_disk_variants
Circular disk on which magnetic data is stored in a hard disk drive
A hard disk drive platter or hard disk is the circular magnetic disk on which digital data is stored in a hard disk drive. The rigid nature of the platters
Hard_disk_drive_platter
Higher performance in hard disk drives comes from devices which have better performance characteristics. These performance characteristics can be grouped
Hard disk drive performance characteristics
Hard_disk_drive_performance_characteristics
Small, movable part of a disk drive
to enable higher areal density. The flying height of the head is controlled by the design of an air bearing etched onto the disk-facing surface of the
Disk_read-and-write_head
magnetic disk storage devices from 1956 to 2003, when it sold its hard disk drive business to Hitachi. Both the hard disk drive (HDD) and floppy disk drive
History of IBM magnetic disk drives
History_of_IBM_magnetic_disk_drives
Mass per unit area
The area density (also known as areal density, surface density, superficial density, column density, or density thickness) of a two-dimensional object
Area_density
Gas and dust surrounding a newly formed star
Ae/Be star. The protoplanetary disk may not be considered an accretion disk; while the two are similar, an accretion disk is hotter and spins much faster
Protoplanetary_disk
File format used by Amiga computers
cylinder 0 to 79 of a standard 3.5-inch (89 mm) double-density floppy disk, also called an 880 KiB disk in Amiga terms. The size of an ADF will vary depending
Amiga_Disk_File
Storage medium from Imation
able to format regular floppy disks to 32 MB capacity. However, this higher density comes at a price – the entire disk must be rewritten any time a change
SuperDisk
General category of storage mechanisms
digital disk storage device was the IBM 350 which shipped in 1956 as a part of the IBM 305 RAMAC computing system. The random-access, low-density storage
Disk_storage
Operating system
0S. Version 2.0S was for single-density disks, 2.0D was for double-density disks. 2.0D shipped with the 815 Dual Disk Drive, which was both expensive
Atari_DOS
Floppy drive by Apple
FileWare floppy disk drives and diskettes were designed by Apple Computer as a higher-performance alternative to the Disk II and Disk III floppy systems
Apple_FileWare
Line code used in early magnetic data storage
bit. For this reason, MFM disks are typically known as "double density", while the earlier FM became known as "single density". MFM is used with a data
Modified_frequency_modulation
Floppy disk drive for the Apple II computer
The Disk II Floppy Disk Subsystem, often rendered as Disk ][, is a 5 +1⁄4-inch floppy disk drive designed by Steve Wozniak at the recommendation of Mike
Disk_II
Structure formed by diffuse material in orbital motion around a massive central body
An accretion disk is a structure (often a circumstellar disk) formed by diffuse material in orbital motion around a massive central body. The central
Accretion_disk
Techniques for using multiple disk drives that do not use RAID
increased storage density and decreased cost are traded for increased latency and decreased redundancy. JBOD (just a bunch of disks or just a bunch of
Non-RAID_drive_architectures
Diffraction pattern in optics
In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best-focused spot of light that a perfect lens with a circular aperture
Airy_disk
Accumulation of matter around a star
A circumstellar disc (or circumstellar disk) is a torus-, pancake- or ring-shaped accretion disk of matter composed of gas, dust, planetesimals, asteroids
Circumstellar_disc
Computer floppy disk format
allows the formatting of high-capacity floppy disks IBM Extended Density Format (XDF), a high-density diskette format used by IBM "Definition of Distribution
Distribution_Media_Format
Floppy disk controller
WD1771, is a floppy disk controller chip, the first in a line of floppy disk controllers produced by Western Digital. It uses single density FM encoding introduced
Western_Digital_FD1771
Computer storage device with no moving parts
or solid-state disk. Etymologically, "solid-state drive" partly refers to existing data storage devices like tape drives and hard disk drives, which all
Solid-state_drive
Discontinued family of computer operating systems
single-density 8-inch floppy disks. Since most 5.25-inch disk formats use larger sectors, the blocking and deblocking and the management of a disk buffer
CP/M
Class of galaxy that has spiral structures extending from their cores
and luminosity); others simply appear as higher density centers of disks, with properties similar to disk galaxies. Many bulges are thought to host a supermassive
Spiral_galaxy
most other Commodore disk drives, these drives utilize zone bit recording to maintain an average bit density across the entire disk. Formatted capacity
Commodore_8050
the magnetic disk medium. The drive also uses variable bit-clock to enable increased data density on a standard single-density floppy disk. It is a form
Commodore_4040
Removable cartridge disk storage system
Zip disk housings are similar to but slightly larger than those of standard 3+1⁄2-inch floppy disks. In the Zip drive, the heads fly over high density media
Zip_drive
Star with a protoplanetary disk around it
(5 Ophiuchi). In 2016, it was discovered that disk perturbations from density waves organized the disk debris into a pinwheel structure, with sweeping
Elias_2-27
Plane figure, bounded by circle
In geometry, a disk (also spelled disc) is the region in a plane bounded by a circle. A disk is said to be closed if it contains the circle that constitutes
Disk_(mathematics)
Data storage technologies that use magnetic tape
The earliest commercially available computers predate the existence of disk storage. Primary storage for these systems was done using tape. The IBM 701
Magnetic-tape_data_storage
The IBM eXtended Density Format (XDF) is a way of superformatting standard high-density 3½-inch and 5{¼-inch floppy disks to larger-than-standard capacities
IBM_Extended_Density_Format
Storage of digital data readable by computers
memory close to the CPU and storage further away. In modern computers, hard disk drives (HDDs) or solid-state drives (SSDs) are usually used as storage. A
Computer_data_storage
Matter and radiation in the space between the star systems in a galaxy
(dominated by the stars in the disk) and the pressure. Further from the disk plane, the ISM is mainly in the low-density warm and coronal phases, which
Interstellar_medium
Computer released in 1984
unreliable hard disk drive, the high-density floppy disk drives turned out to be problematic. Some ATs came with one high-density (HD) disk drive and one
IBM_Personal_Computer_AT
Encoding methods for representing data on magnetic media
hard disks or microcomputer floppy disks until the late 1980s. GCR is a modified form of a NRZI code, but necessarily with a higher transition density. Group
Group_coded_recording
Spatial anti-aliasing method
many fast algorithms now exist to generate Poisson disk noise, even those with variable density. The Delone set provides a mathematical description of
Supersampling
Branch of astrophysics
everywhere at all time. Consider again the thick disk potential in the above example. If the density is that of a gas fluid, then the pressure would be
Stellar_dynamics
Data storage device
supplementary back-ups, and transferring of computer files. Compared with floppy disks or CDs, they are smaller, faster, have significantly more capacity, and
USB_flash_drive
engineers at IBM's San Jose California laboratory invented the hard disk drive. The disk drive created a new level in the computer data hierarchy, then termed
History_of_hard_disk_drives
Logical or physical division of storage media
In computer disk storage, a sector is a subdivision of a track on a magnetic disk or optical disc. For most disks, each sector stores a fixed amount of
Disk_sector
Disk drive for Digital Equipment Corporation minicomputers
The RK05 is a disk drive manufactured by Digital Equipment Corporation whose removable disk pack can hold about 2.5 megabytes of data. Introduced 1972
RK05
Early portable microcomputer
single-sided, single-density floppy disk drives that store 90 kB per disk, and considerable unit weight. Adam Osborne decided to use single-sided disk drives out
Osborne_1
Floppy disk or optical disk drive made by Apple
floppy disk drive and later an optical disc drive made and marketed by Apple Inc. The name was initially used for Apple's high-density floppy disk drive
SuperDrive
Galaxy containing the Solar System
nothing more than an over-density produced by the flared and warped thick disk of the Milky Way. The structure of the Milky Way's disk is warped along an "S"
Milky_Way
External floppy disk drive by Apple
The Macintosh External Disk Drive is the original model in a series of external 3+1⁄2-inch floppy disk drives manufactured and sold by Apple Computer
Macintosh_External_Disk_Drive
High-density disk drive recording technology
technology used in hard disk drives (HDDs) to increase storage density and overall per-drive storage capacity. Conventional hard disk drives record data by
Shingled_magnetic_recording
Topics referred to by the same term
Ultra Density Optical Universal Media Disc Disk enclosure ROM cartridge This disambiguation page lists articles associated with the title Disk cartridge
Disk_cartridge
Operating system for Tandy TRS-80 computers
supported 40-track disks formatted in double density (using modified frequency modulation). Model Is retrofitted with double density controllers and Models
TRSDOS
Particle outflow from an accretion disk
astronomy, a disk wind is a particle outflow observed around accretion disks, mainly near protoplanetary disks and active galactic nuclei (AGN). The disk wind
Disk_wind
Branch of mathematics in probability theory
(point) density λ. For each point of the Poisson process (i.e. xi ∈ Φ), place a disk Di with its center located at the point xi. If each disk Di has a
Continuum_percolation_theory
Compact astronomical body
gas in the outer disk, transferring angular momentum to the outer disk. The loss of angular momentum forces the gas in the inner disk to orbit closer to
Black_hole
Distance over which a quantity decreases by a factor of e
the gas in the disk ρ {\displaystyle \rho } = the gas mass density in the disk In the thin disk approximation, z ≪ r {\displaystyle z\ll r} , and the hydrostatic
Scale_height
White dwarf in the constellation Virgo
with a debris disk around it. The disk formed when a planetary body was tidally disrupted around the white dwarf. It is the first gaseous disk discovered
SDSS_J1228+1040
Disk interface for ZX Spectrum computers
version is 5.03 (1986). The Beta Disk Interface handles single- and double-sided, 40- or 80-track double-density floppy disks, and up to four drives. This
Beta_Disk_Interface
Structural component of some galaxies
the Milky Way, different from the thin disk and the halo. It is thought to dominate the stellar number density between 1 and 5 kiloparsecs (3.3 and 16
Thick_disk
Flat, usually circular disc that encodes binary data
often printed or stamped onto the disc itself. Unlike the 31⁄2-inch floppy disk, most optical discs do not have an integrated protective casing and are therefore
Optical_disc
Mathematical concept applicable to physics
measure the total flow through the surface, q measures the flow through the disk with area A centered at p along the surface. Finally, flux as a vector field:
Flux
Device in optics that reduces light intensity
In photography and optics, a neutral-density filter, or ND filter, is a filter that reduces or modifies the intensity of all wavelengths, or colors, of
Neutral-density_filter
Astronomical phenomenon
In warm and viscous disks, Type I migration may apply to larger mass planets. In locally isothermal disks and far from steep density and temperature gradients
Planetary_migration
Recording of data on a magnetizable medium
companies are working. However, with storage density and capacity orders of magnitude smaller than a hard disk, MRAM is useful in applications where moderate
Magnetic_storage
File system handler for accessing FAT formatted media on Amiga computers
double density (720 KB) and high density (1.44 MB) floppy disks on compatible disk drives. As with AmigaDOS disk handling, it allowed automatic disk-change
CrossDOS
Structural component of galaxies
and dust. It is the main non-centre (e.g. galactic bulge) density of such matter. The thin disk of the Milky Way is thought to have a scale height of around
Thin_disk
Astronomical theory about the Solar System
supply from the disk is exhausted. This happens gradually, due to the formation of a density gap in the protoplanetary disk and to disk dispersal. In this
Nebular_hypothesis
Mathematical model in fluid dynamics
dynamics, momentum theory or disk actuator theory is a theory describing a mathematical model of an ideal actuator disk, such as a propeller or helicopter
Momentum_theory
Automatic, disk-wide data compression
Disk compression increases the amount of information that can be stored on a disk by automatically compressing and decompressing data as it is written
Disk_compression
Obsolete form of removable media
Disk packs and disk cartridges were early forms of removable media for computer data storage, introduced in the 1960s. A disk pack is a layered grouping
Disk_pack
Coding technique in communication technology
used in hard disk drives until the mid-1980s. Higher-density (2,7) RLL and (1,7) RLL codes became the de facto industry standard for hard disks by the early
Run-length_limited
Chemical compound
Low-density polyethylene (LDPE) is one of several varieties of polyethylene (PE). PE's, the dominant synthetic polymer, are produced in many forms that
Low-density_polyethylene
Digital optical disc data storage format
initially offered more capacity than contemporary personal computer hard disk drives. Additional derived formats include write-once discs (CD-R), rewritable
Compact_disc
Third planet from the Sun
which begins to spin and flatten into a circumstellar disk, and then the planets grow out of that disk with the Sun. A nebula contains gas, ice grains, and
Earth
High capacity floppy disk system
The Caleb Technology UHD144 (Ultra High Density) is a floptical-based 144 MB floppy disk system introduced in early 1998, marketed as the it drive. Like
Caleb_UHD144
States of matter for water as a solid
suppressing long-range density fluctuations and are, therefore, nearly hyperuniform. Classification analysis suggests that low and high density amorphous ices
Phases_of_ice
Type of floppy disk drive
type of floppy disk drive that combines magnetic and optical technologies to store data on media similar to standard 3+1⁄2-inch floppy disks. The name is
Floptical
Floppy disk controller
containing Cromemco's RDOS, the resident disk operating system. The 4FDC was designed to drive Persci 277 8-inch single-density floppy drives. These drives were
Cromemco_4FDC
Model of early Solar System evolution
characteristics of the protoplanetary disk. After capture into resonance, the gaps that Jupiter and Saturn formed in the disk's density distribution may overlap and
Nice_2_model
American computer storage products manufacturer
developments in traditional, re-writable hard drive–based NASes, whose disk densities and cost-per-megabyte were quickly rivaling that of the CD-ROM. The
Procom_Technology
of floppy disks. FDFORMAT is written by Christoph H. Hochstätter in Pascal. It allows users to format a floppy to a higher than usual density, enabling
Fdformat
Commodore floppy disk drive
The Commodore 1581 is a 3½-inch double-sided double-density floppy disk drive that was released by Commodore Business Machines (CBM) in 1987, primarily
Commodore_1581
Process of reformatting floppy disks to have more memory
format low-density 3.5-inch or 5.25-inch floppies as high-density, or even extra-high density (such as HD-36) in the case of 3.5-inch disks. Superformatting
Superformatting
Disk format and access using sector sizes larger than 512 bytes
between continuing increases in areal density and the traditional 512-byte-per-sector format used in hard disk drives. Without revolutionary breakthroughs
Advanced_Format
Visible wave pattern in a supersonic exhaust plume
(also known as Mach diamonds or thrust diamonds, and less commonly Mach disks) are a formation of standing wave patterns that appear in the supersonic
Shock_diamond
Star at the centre of the Solar System
this matter gathered in the centre; the rest flattened into an orbiting disk that became the Solar System. The central mass became so hot and dense that
Sun
Since the invention of the floppy disk drive, various standardized form factors have been used in computing systems. Standardized form factors and interface
List of disk drive form factors
List_of_disk_drive_form_factors
semiconductor lasers. The disk laser concepts allow very high average and peak powers due to its large area, leading to moderate power densities on the active material
Disk_laser
Screen resolution measured in pixels per length
too high then pixels will be stored unnecessarily—wasted disk space. The ideal pixel density (PPI) depends on the output format, output device, the intended
Pixel_density
Type of giant planet
protoplanetary disk could also produce several gas giant protoplanets out to distances of up to 30 AU. Regions of slightly higher density in the disk could lead
Ice_giant
Number of available physical states per energy unit
linear, disk and spherical symmetrical shaped functions in 1, 2 and 3-dimensional Euclidean k-spaces respectively. According to this scheme, the density of
Density_of_states
Engineered wood product
Medium-density fibreboard (MDF) is an engineered wood product made by breaking down hardwood or softwood residuals into wood fibre, often in a defibrator
Medium-density_fibreboard
Floppy disk drive
floppy disk drive, announced in the summer of 1985. With its double-sided drive mechanism, it has the ability to use double-sided, double-density (DS/DD)
Commodore_1571
Early form of read-only memory
Partition Table Disk array Disk image Disk mirroring Disk aggregation Disk partitioning Memory segmentation Locality of reference Logical disk Storage virtualization
Core_rope_memory
Floppy disk drive
official support for double-density and double-sided floppy disks—360 kB of storage per disk—and was also the final floppy disk drive Atari produced for
Atari_XF551
Desktop computer developed by Xerox
introduced the 820 in June 1981 for $2,995 with two 5+1⁄4-inch single-density disk drives with 81K of capacity per diskette, or $3,795 with two 8-inch drives
Xerox_820
DISK DENSITY
DISK DENSITY
Surname or Lastname
English and Scottish
English and Scottish : unexplained. The name has been recorded in Glastonbury, Somerset, since 1705.Perhaps a variant of Czech LiÅ¡ka, (see Liska), Slovak LÃÅ¡ka, or German Liske.
Boy/Male
German Teutonic American Dutch English
Dagger.
Boy/Male
American, Australian, British, Chinese, Christian, Danish, Dutch, English, French, German, Swedish, Teutonic
Rich and Powerful Ruler; Powerful; Rich Ruler; Dominant Ruler; Peaceful Ruler; Strong Power; Hardy Power; Powerful Ruler; Brave; First of the People
Boy/Male
Australian, Egyptian
Sun Disk
Girl/Female
Norse Greek
Spirited.
Girl/Female
British, English
Direction
Male
German
 Short form of German Diederick, DIRK means "first of the people; king of nations."
Male
Egyptian
, the most lovely Disk.
Boy/Male
Christian & English(British/American/Australian)
Ruler of People
Surname or Lastname
English (East Anglia)
English (East Anglia) : metonymic occupational name for a fisherman or fish seller, or a nickname for someone supposedly resembling a fish in some way, from Old Norse fiskr ‘fish’ (cognate with Old English fisc).
Male
Egyptian
, disk.
Boy/Male
Australian, British, English, Scandinavian
Fisherman; Fish
Boy/Male
Swedish English
Fisherman.
Girl/Female
Australian, Danish, Greek, Norse, Scandinavian, Swedish
Active Spirit; Goddess; Double
Male
English
 Short form of English Richard, DICK means "powerful ruler." Compare with another form of Dick.
Boy/Male
American, Australian, British, Chinese, Christian, Danish, Dutch, English, French, German, Indian, Netherlands, Scandinavian, Swedish, Swiss, Teutonic
Ruler of the People; Form of Derek; First of the People; King of Nations
Girl/Female
Norse
Spirited.
Male
Dutch
, people's ruler.
Boy/Male
Teutonic American English German Shakespearean
Rules the people.
Surname or Lastname
English
English : habitational name from Diss in Suffolk, which gets its name from a Norman pronunciation of Middle English diche, Old English dīc ‘ditch’, ‘dike’ (see Dyke).German : habitational name from Dissen near the Teutoburg forest.
DISK DENSITY
DISK DENSITY
Biblical
a hundred cubits
Girl/Female
Muslim/Islamic
Angel
Girl/Female
Indian, Kannada
God's Gift
Girl/Female
Biblical
Knowledge of God.
Boy/Male
Hindu
God of Yoga
Surname or Lastname
English
English : habitational name from a place in Bedfordshire, so named from Old English sand ‘sand’ + ēg ‘island’, ‘dry land in a fen or marsh’.English : from the Old Norse personal name Sand(i), a short form of the various compound names with the first element sandr ‘sand’.
Boy/Male
American, British, English
From the Barley Ford
Boy/Male
Hindu, Indian, Marathi
New; Young
Male
Welsh
Welsh form of Roman Latin Victor, GWYTHYR means "conqueror."
Girl/Female
French American
From the island.
DISK DENSITY
DISK DENSITY
DISK DENSITY
DISK DENSITY
DISK DENSITY
a.
Disk-shaped; discoid.
n.
The state of being concave, or like a dish, or the degree of such concavity; as, the dish of a wheel.
n.
Imperfect obscurity; a middle degree between light and darkness; twilight; as, the dusk of the evening.
n.
A circular structure either in plants or animals; as, a blood disk; germinal disk, etc.
n.
A circular structure either in plants or animals; as, a blood disc, a germinal disc, etc. Same as Disk.
n.
The lower side of the body of some invertebrates, especially when used for locomotion, when it is often called a creeping disk.
v. t.
To stab with a dirk.
n.
The food served in a dish; hence, any particular kind of food; as, a cold dish; a warm dish; a delicious dish. "A dish fit for the gods."
v. t.
To shut up, as in a desk; to treasure.
n.
In owls, the space around the eyes.
v. i.
To grow dusk.
v. t.
To put in a dish, ready for the table.
n.
A disk. See Disk.
n.
To incur the risk or danger of; as, to risk a battle.
n.
A flat, circular plate; as, a disk of metal or paper.
v. t.
To make dusk.
n.
To expose to risk, hazard, or peril; to venture; as, to risk goods on board of a ship; to risk one's person in battle; to risk one's fame by a publication.
v. t.
To make concave, or depress in the middle, like a dish; as, to dish a wheel by inclining the spokes.