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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
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
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)
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
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
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
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
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
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
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
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
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
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
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
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
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)
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
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
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
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
Distance over which a quantity decreases by a factor of e
P = the pressure of the gas in the disk ρ = the gas mass density in the disk In the thin disk approximation, z≪r, and the hydrostatic equilibrium, the
Scale_height
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
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
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
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
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
Hot plasma around an accretion disk
an accretion disk corona (ADC) is a region of hot plasma surrounding an accretion disk, analogous to a stellar corona. Accretion disk coronae are particularly
Accretion_disk_corona
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
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
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
The IBM eXtended Density Format (XDF) is a way of superformatting standard high-density 3½-inch and 5¼-inch floppy disks to larger-than-standard capacities
IBM_Extended_Density_Format
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
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
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
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
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
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
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
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
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
Floppy disk drive for Atari 8-bit computers
Atari 1050 is a floppy disk drive for Atari 8-bit computers released in June 1983. It is compatible with the 90 kB single-density mode of the original Atari
Atari_1050
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
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
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
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
File format representing a virtual hard disk drive
VHD (Virtual Hard Disk) and its successor VHDX are file formats representing a virtual hard disk drive (HDD). They may contain what is found on a physical
VHD_(file_format)
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
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
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
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
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
Star in the constellation Centaurus
an angle of 6.7°+3.8° −0.4° to the line of sight from the Earth. The disk density declines outside that radius. Between 2018 and 2022, HD 114082 was examined
HD_114082
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
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
ClarisWorks. A high-density diskette in DOS format formatted as a 720K disk would not function correctly; the Mac assumed that any high-density disk has been formatted
Apple_File_Exchange
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
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
Chemical compound
Low-density polyethylene (LDPE) is one of several varieties of polyethylene (PE). PEs, the dominant synthetic polymer, are produced in many forms that
Low-density_polyethylene
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
Second model of Apple's Macintosh computer line
Computerworld, 1 February 1988 Apple Inc. (August 22, 1991). "Double-Density Versus High-Density Disks". Article ID: 3802. Apple Inc. Archived from the original
Macintosh_512K
3.5-inch hard disk drive made by Quantum Corporation
D540X was available in 20.4GB, 40GB, 60GB and 80GB capacities with disk densities of 40GB/platter, using 2 platters for a maximum of 80GB and with 2MB
Quantum_Fireball
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
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
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
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
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
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
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
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
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
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
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
Organization that shares designs of data center products
"Knox") offer high disk densities, with 30 drives in a 2 OU Open Rack chassis designed for easy disk drive replacement. The 3.5 inch disks are stored in two
Open_Compute_Project
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
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
Series of devices
branded by SmartDisk, and as OEM devices under other brand names. FlashPath is hardware compatible with all standard 3.5" High-Density Floppy disk drives, but
FlashPath
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
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
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
American computer peripheral manufacturer
million. The 440 kilobyte SA450, a double-sided double-density 5¼-inch full height floppy disk drive was announced in December 1977 at $450. In 1979,
Shugart_Associates
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
Computer operating system
acronym for IBM Personal Computer Disk Operating System), also known as IBM DOS or PC DOS, is a discontinued disk operating system for the IBM Personal
IBM_PC_DOS
Early Z80-based microcomputer
II (released in 1982), SuperBrain II Jr., "QD" (quad-density disk drives) and "SD" (super density) models. Intertec also released a similar looking dumb
Intertec_Superbrain
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
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
Glued wood product
fiberboard, except for insulation board. Medium-density fibreboard and hardboard, also called high-density fiberboard, are stronger and denser than particle
Particle_board
Accumulation of matter around a planet
In the last stage the disk is full, but has a low density and can be classified as "evolved". Additional to a circumplanetary disk, a protoplanet can also
Circumplanetary_disk
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
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