Disk storage

disk drivediskdisksdrivedisc drivesdisk drivesdiscmagnetic diskcomputer diskdisc drive
Disk storage (also sometimes called drive storage) is a general category of storage mechanisms where data is recorded by various electronic, magnetic, optical, or mechanical changes to a surface layer of one or more rotating disks.wikipedia
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Floppy disk

floppy disk drivefloppy drivediskette
Notable types are the hard disk drive (HDD) containing a non-removable disk, the floppy disk drive (FDD) and its removable floppy disk, and various optical disc drives (ODD) and associated optical disc media.
A floppy disk, also known as a floppy, diskette, or simply disk, is a type of disk storage composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic enclosure lined with fabric that removes dust particles.

Optical disc drive

optical driveCD driveDVD drive
Notable types are the hard disk drive (HDD) containing a non-removable disk, the floppy disk drive (FDD) and its removable floppy disk, and various optical disc drives (ODD) and associated optical disc media.
In computing, an optical disc drive (ODD) is a disc drive that uses laser light or electromagnetic waves within or near the visible light spectrum as part of the process of reading or writing data to or from optical discs.

History of IBM magnetic disk drives

IBM 350IBM 2311IBM 1311
The first commercial digital disk storage device was the IBM 350 which shipped in 1956 as a part of the IBM 305 RAMAC computing system.
IBM manufactured magnetic disk storage devices from 1956 to 2003, when it sold its hard disk drive business to Hitachi.

IBM 305 RAMAC

RAMACIBM 305305 RAMAC
The first commercial digital disk storage device was the IBM 350 which shipped in 1956 as a part of the IBM 305 RAMAC computing system.
The IBM 305 RAMAC was the first commercial computer that used a moving-head hard disk drive (magnetic disk storage) for secondary storage.

Zip drive

ZipZip diskIomega ZIP
Storage devices focused on holding computer data, e.g., HDDs, FDDs, Iomega zip drives, use concentric tracks to store data.
The Zip drive is a removable floppy disk storage system that was introduced by Iomega in late 1994.

Constant angular velocity

CAV
In optical storage, constant angular velocity (CAV) is a qualifier for the rated speed of any disc containing information, and may also be applied to the writing speed of recordable discs.

Cylinder-head-sector

CHScylindercylinders
The drive stores data onto cylinders, heads, and sectors.
A cylinder is a division of data in a disk drive, as used in the CHS addressing mode of a Fixed Block Architecture disk or the cylinder–head–record (CCHHR) addressing mode of a CKD disk.

Computer data storage

main memorystoragememory
Digital disk drives are block storage devices.

Disk array

storage arraydisk arraysarray
A disk array is a disk storage system which contains multiple disk drives.

Disk read-and-write head

headheadsread/write head
Disk read/write heads are the small parts of a disk drive which move above the disk platter and transform the platter's magnetic field into electrical current (read the disk) or, vice versa, transform electrical current into magnetic field (write the disk).

RAID

redundant array of independent disksRAID arrayRedundant Array of Inexpensive Disks
RAID (Redundant Array of Inexpensive Disks or Drives, or Redundant Array of Independent Disks) is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both.

Hard disk drive performance characteristics

seek timerotational latencydisk seek
The data on the media is stored in sectors which are arranged in parallel circular tracks (concentric or spiral depending upon the device type) and there is an actuator with an arm that suspends a head that can transfer data with that media.

Disk sector

sectorsectors sectors
Data on modern disks is stored in fixed length blocks, usually called sectors and varying in length from a few hundred to many thousands of bytes.

Logical block addressing

LBAlogical block address64-bit LBA
Blocks are addressed using their logical block addresses (LBA).

Optical disc

optical mediaoptical data storageoptical discs
Notable types are the hard disk drive (HDD) containing a non-removable disk, the floppy disk drive (FDD) and its removable floppy disk, and various optical disc drives (ODD) and associated optical disc media.

Spelling of disc

discspelledspelling '''disk''' and '''disc
(The spelling disk and disc are used interchangeably except where trademarks preclude one usage, e.g. the Compact Disc logo.

Sound

audiosound wavesound waves
Audio information was originally recorded by analog methods (see Sound recording and reproduction).

Sound recording and reproduction

recordingrecordedrecordings
Audio information was originally recorded by analog methods (see Sound recording and reproduction).

LaserDisc

LDlaser discLaserVision
Similarly the first video disc used an analog recording method.

Optics

opticalopticoptical system
In the music industry, analog recording has been mostly replaced by digital optical technology where the data is recorded in a digital format with optical information.

Random-access memory

RAMmemoryrandom access memory
The random-access, low-density storage of disks was developed to complement the already used sequential-access, high-density storage provided by tape drives using magnetic tape.

Sequential access

sequentialsequentiallySequential I/O
The random-access, low-density storage of disks was developed to complement the already used sequential-access, high-density storage provided by tape drives using magnetic tape.

Tape drive

tape drivestapetape backup
The random-access, low-density storage of disks was developed to complement the already used sequential-access, high-density storage provided by tape drives using magnetic tape.

Magnetic tape

tapetapesanalog tape
The random-access, low-density storage of disks was developed to complement the already used sequential-access, high-density storage provided by tape drives using magnetic tape.