direct access storage device
DASD

These records need not be held in this 'logical' sequence (see Figure 5.9(c)), as long as the files are held on direct access storage devices.

The IBM 3380 Direct Access Storage Device was introduced in June 1980.

Direct access storage devices (DASD)

A dataset is typically stored on direct access storage device (DASD) or magnetic tape, however unit record devices are also supported.

The IBM 2321 Data Cell announced in April 1964 was a direct access storage device for the IBM System/360.

The simplest loosely coupled system would be two IBM mainframes sharing one DASD (Direct Access Storage Device).

The IBM 3390 Direct Access Storage Device series was introduced November 1989, offering a maximum storage of up to 22 gigabytes in a string of multiple drives.

To me this sounds like an amalgam of NAS and DASD (Direct Access Storage Device) from mainframe days.

The new generation of disk drives, known as the 3390 Direct Access Storage Device, can store and retrieve more data for the company's large mainframe computers than its previous disk drive models.

Manage:DASD - Software to accommodate Direct Access Storage Device maintenance on OS/MVS systems.

Some devices, such as magnetic tape, naturally enforce sequential access, but it can be used as well on direct access storage devices (DASD), such as disk drives.

IBM uses the term data set in official documentation as a synonym of file, and Direct access storage device (DASD) because it supported other devices similar to disk drives.

In the 1970s IBM introduced the Direct Access Storage Device (DASD) with Fixed Block Architecture using sizes of 512, 1024, 2048, or 4096 bytes.

IBM introduced the IBM 3370 Direct Access Storage Device in January 1979 for its for IBM 4331, 4341, and System/38 midrange computers.

Although its storage medium was tape, the 2321 was a direct access storage device which could directly access a record rather than scan all the tape to find a record as would a conventional tape drive.

IBM has used many terms to describe its various magnetic disk drives, such as Direct Access Storage Device, Disk File and Diskette File; however, here the current industry standard terms, hard disk drive and floppy disk drive are used.

The sole exception is, of course, the ERP for direct access storage devices, which must always remain resident in order to recover from possible I/O errors on the IPL volume and on other volumes which contain datasets which may be concatenated with certain system datasets.

Other forms of Direct Access Storage Device (DASD), such as drum memory devices or the IBM 2321 Data Cell, might give blocks addresses that include a cylinder address, although the cylinder address doesn't select a (geometric) cylindrical slice of the device.

This was due in part to the physical record sizes of blocks located on DASD.

For example, a DASD device at base address 1000, could have alias addresses of 1001, 1002 and 1003.

The DASD gifted census was 60 students or 1.62% of its pupils in 2009.

DASD may refer to:

The access methods for DASD are Sequential, Indexed and Direct.

Direct access storage devices (DASD)

Both drums and data cells have disappeared as products, so DASD remains as a synonym of a disk device.

DASD Afghanistan, Pakistan and Central Asia.

BPE provided support for new 1980s hardware, such as 3380 DASD (disk).

A dataset is typically stored on direct access storage device (DASD) or magnetic tape, however unit record devices are also supported.

(U) DASD Schiffer cleared this message.

Dover Area School District (DASD) Administration reported that 56 or 1.52% of its students were gifted in 2010.

The choice, DASD Schiffer said, was North Korea's to make: to walk through the open door of engagement or not.

DASD Schiffer noted that rewarding bad behavior set up bad incentives and created a moral hazard, which would not lead to a successful resolution.

He retired from the Marine Corps as a Colonel with 27 years of service prior to his appointment as DASD.

As DASD prices dropped, the facility dropped from use, and SVS did not provide it.

In this case the control program would be equally loaded into core and each program or record on DASD could be potentially accessed by either mainframe.

With the advances made in DASD technology, a read/write of a 4K record is just as efficient as a 1055 byte record.

The storage CLASS of DASD is both Fixed and Removable.

Once at the DASD level, the latter are considered a part of the DoD Senior Executive Service.

A noteworthy deviation from the architecture is that DASD use Sense command codes for Reserve and Release, instead of using Control.

This is intended for devices in which there is a mechanical delay after completion of data transfer, e.g., for seeks on moving-head DASD.

The 5362 also allowed the use of a channel attached external desktop 9332-200, 400, & 600 DASD, effectively allowing a maximum of 720MB.

Following this acquisition, The U.S. Operation was known as Cap Gemini DASD.

I.B.M.'s market leader was a storage product known generically as DASD, for direct-access storage device.