* Auxiliary Storage Pool, a group of disk drives in the IBM i ( aka OS / 400 ) operating system

The keyboard, mouse, display, disk drives and network were all controlled by a microkernel.

The 1977 Apple II, shown here with two Disk II floppy disk drives and a 1980s-era Apple Monitor II.

This model was used in a cluster with one Aster ( with disk drives ) for the teacher, and eight disk less versions for the pupils.

Among the kits sold there were also alternative floppy disk drives for TRS-80 computers.

Because the original designer had left the company another employee completely redesigned most of the system, ( adding a display snow remover circuit, true 80 / 64 column text mode support, ( with different size letters for TRS-80 and CP / M mode, so that in TRS-80 mode the full screen was also used, not just a 64x16 portion of the 80x25 screen ) with an improved font set ( adding " gray scale " version of the TRS-80 mozaik graphics and many special PETSCII like characters ), and a more flexible and reliable floppy disk controller and keyboard interface plus many other small improvements ), also an enclosure was developed for the main computer system, ( in the form of a 19-inch rack for the Eurocards ) and for two floppy disk drives and the power supply.

Additionally, a wide range of first and third party hardware extensions such as external disk drives, printers, and memory extensions, was available.

A keyboard was developed, and the keyboard had an expansion port ( which was the SIO port from Atari's 8-bit computer line, though the 7800 could not run Atari computer programs ) allowed for the addition of peripherals such as disk drives and printers.

In the 1960s most disk drives used IBM's variable block length format ( called Count Key Data or " CKD ").

One of the earliest hard disk drives in personal computing history,

Like IBM, Burroughs tried to supply a complete line of products for its customers, including Burroughs-designed printers, disk drives, tape drives, computer printing paper, and even typewriter ribbons.

Storage consists of storage devices and their media not directly accessible by the CPU, ( secondary or tertiary storage ), typically hard disk drives, optical disc drives, and other devices slower than RAM but are non-volatile ( retaining contents when powered down ).

By contrast, peer-to-peer networks involve two or more computers pooling individual resources such as disk drives, CD-ROMs and printers.

Even though each 1541 had its own on board disk controller and disk operating system, it was not possible for a user to command two 1541 drives to copy a disk ( one drive reading and the other writing ) as with older dual drives like the 4040 and 8050 that were often found with the PET computer, and which the 1541 was backward compatible to ( it could read 4040 disks but not write to them since its internal Operating System was essentially the same ).

One could then unplug the C64 itself from the drives ( i. e. from the first drive in the daisy chain ) and do something else with the computer as the drives proceeded to copy the entire disk.

We used the latter equipped with a carborundum disk about

Multiple anagramming is a technique used to solve some kinds of cryptograms, such as a permutation cipher, a transposition cipher, and the Jefferson disk.

Per a News article on Page # 9 of the October 1984 issue of Acorn User, the Plus 3 was originally destined to have used the Intel 8272 disk controller, ( and not 8271, which were in short supply at the time ).

A special version of NewDos / 80, ( an improved TRS-DOS compatible Disk operating system ) was used to support these disk capacities when using the TRS-80 compatibility mode.

But these needed the infamous TRS-80 expansion interface, which was very expensive, and had a very unreliable floppy disk controller because it used the WD1771 floppy disc controller chip without an external " data separator ".

Hard disk drive manufacturers used " megabytes " or " MB ", meaning 10 < sup > 6 </ sup > bytes, to characterize their products as early as 1974.

The name originated from the Basic Input Output System used in the CP / M operating system ( released in 1976 ), where the BIOS was loaded from disk, with only a small boot loader program stored in read-only memory.

Such items include tiles used in the Space Shuttle program, gas burner nozzles, ballistic protection, nuclear fuel uranium oxide pellets, biomedical implants, coatings of jet engine turbine blades, ceramic disk brake, missile nose cones, bearing ( mechanical ).

This plastic pilot shaft guide tool is used to align the clutch disk as the spring-loaded pressure plate is installed.

Front view of the most common version of the Commodore 1541 disk drive, with open disk slot: this version uses a Newtronics drive mechanism, and the rotating lever is used to hold the disk in place

The disk drive used Group Code Recording ( GCR ) and contained a MOS Technology 6502 microprocessor, doubling as a disk controller and on-board disk operating system processor.

Accordingly, when a disk was formatted or a disk error occurred, the unit would try to physically move the head 40 times in the direction of track zero ( although the 1541 DOS only used 35 tracks, the drive itself was a 40 track unit, so this ensured track zero would be reached no matter where the head was before ).

Unlike the case of the 1541 and 1571, the low-level disk format used by the 1581 is similar enough to the MS-DOS format as the 1581 is built around a WD1770 FM / MFM floppy controller chip.

( However, with a program organizing disk storage on its own, all space could be used, e. g. for data disks.

Disk Operating System ( specifically ) and disk operating system ( generically ), most often abbreviated as DOS, refer to an operating system software used in most computers that provides the abstraction and management of secondary storage devices and the information on them ( e. g., file systems for organizing files of all sorts ).

Scribe V-shaped lines on the bar and rough out with either a hack saw or a cutting disk in a hand power tool.

The " dual boot mode " BIOS actually discovered whether a TRS-DOS, or Aster CP / M disk was placed in the drive, and would, depending on the type of disk, reorganise the internal memory architecture of the system, to either be 100 % TRS-80 compatible or optimally support CP / M, with as much " workspace " as possible, and the 80x25 video mode.

Their computer-in-a-keyboard design prominently features an integrated storage device, either a compact cassette deck or 3 " floppy disk drive.

In two dimensions, closed disks are compact since for any infinite number of points sampled from a disk, some subset of those points must get arbitrarily close either to a point within the disc, or to a point on the boundary.

A special case is a zero byte file ; these files are either an accident ( a result of an aborted disk operation ) or serve as some kind of flag in the file system.

France issues either a metallic rounded rectangle ( Army ) or disk ( Navy ), designed to be broken in half, bearing Family Name & First Name above the ID number.

( The DOS could utilize the additional RAM available in the protected mode — extended memory either via BIOS call ( INT 15h, AH = 87h ), or as RAM disk, or as emulation of expanded memory.

Jurists cast a ceramic disk with an axle in its middle: the axle was either hollow or solid.

One method of starting is to use both index mirror and horizon mirror shades, of sufficient darkness that the sun appears through either as a solid disk and does not hurt the eyes.

To run clustered ( loosely-coupled ) zTPF requires either MPLF in all disk control units or an alternative locking device called a Coupling Facility.

This was hypothesized as either a perturbation of the dust disk by a planet or else an orbiting object that was surrounded by dust.

A horse or bull figure on the same stand, topped by a solar disk, may represent either Yahweh or Baal, and a stylised tree and female figures are testimony to the presence of goddesses ( possibly Asherah ) in the pantheon.

It used a 7. 16 MHz 8088-2 processor, had 384k of memory ( upgradeable to on the motherboard ), came with either one or two 5. 25 " internal floppy disk drives, had the light pen port ( not a serial port ) like the original Tandy 1000, and lacked the volume control and headphone jack of the TX ( also like the original 1000 ).

More generally, for points in any dimension in general position, each facet of the convex hull is either oriented upwards ( separating the hull from points directly above it ) or downwards ; the union of the upward-facing facets forms a topological disk, the upper hull, and similarly the union of the downward-facing facets forms the lower hull.

Interestingly, the PDP-1 has a hardware built-in loader, such that an operator need only push the " load " switch to instruct the paper tape reader to load a program directly into core memory ; the boot loader reads into core memory either the second-stage boot loader ( called Binary Loader of paper tape with checksum ) or the operating system from an outside storage medium such as a paper tape, a punched card, or a disk drive.

This is intended mainly for use by disk utilities and is only updated when either the Catalog File or Extents Overflow File grow in size.

* Examine the smallest top disk that is not disk 0, and note what its only ( legal ) move would be: ( if there is no such disc, then we are either at the first or last move ).

For the other disks there is always one possibility, except when all disks are on the same peg, but in that case either it is the smallest disk that must be moved or the objective has already been achieved.

A solution was proposed by Andreas Hinz, and is based on the observation that in a shortest sequence of moves, the largest disk that needs to be moved ( obviously one may ignore all of the largest disks that will occupy the same peg in both the initial and final configurations ) will move either exactly once or exactly twice.

Protocol Analyzers can also be hardware-based, either in probe format or, as is increasingly more common, combined with a disk array.

Some implementations do not neatly fit either category: a DOM approach can keep its persistent data on disk, cleverly organized for speed ( editors such as SoftQuad Author / Editor and large-document browser / indexers such as DynaText do this ); while a SAX approach can cleverly cache information for later use ( any validating SAX parser keeps more information than described above ).

An " A600HD " model was sold with an internal 2. 5 " ATA hard disk drive of either 20 or 40 MB.

The data are either direct to disk recording or are imported from another source ( transcoding, digitizing, transfer ).