Posts Tagged ‘data recovery glossary’

Data Recovery Glossary (Letter G J K N O Q Z )

February 11th, 2010 Comments off

GB (Gigabyte)
One gigabyte is 1,000,000,000 (one billion) bytes or 1000 (one thousand) Megabytes.

In EIDE drives, a jumper is an electrically-conductive component that you place over pairs of pins that extend from the circuit board on the hard drive jumper block to connect them electronically. For example, a jumper is one way to designate a hard drive as master or slave. The jumper block is located next to the 40-pin connector on the hard drive.

Just-in-time (JIT)
A production and inventory control process in which components and materials are delivered to an assembly point as needed. This process is used in many hard drive manufacturing facilities.

Kilobyte (KB)
1024 bytes, although it often considered to be a unit of 1000 bytes. In the case of computer memory, which is partitioned into sizes that are a power of two, a kilobyte is equal to 2 10 or 1024 bytes.

Network Computer
A kind of computer that contains limited data storage capacity and is used to communicate with a central data storage facility such as a server or RAID system.

Operating System
Software that allows the user and programs installed on your system to communicate with computer hardware such as a hard drive.

Original Equipment Manufacturer (OEM)
In the case of the hard drive and data recovery industries, OEM customers are companies such as Compaq, Gateway, IBM and Dell.

The process by which sample components are tested for their compatibility and utility as parts of a system.

A first-in-first-out (FIFO) data structure used to sequence multiple demands for a resource such as a printer, processor, or communications channel. The host adds objects to the end of the queue and takes them off the front.

Zoned Recording
Increases the number of sectors on the outer tracks of the drive since the circumference of the outside tracks is greater. This type of recording affords more disk capacity because there can be more sectors on the larger outer tracks than would be possible if the number of sectors per track were constant for the whole drive.

Data Recovery Glossary (Letter W)

February 8th, 2010 Comments off

Winchester Disk
Former code name for an early IBM hard disk model, sometimes still used to refer to the technology and design of most traditional hard drives.

Microsoft’s series of operating systems for personal computers. Currently popular versions are Windows 95 and Windows 98.

Two bytes that are processed together in a single operation.

A personal computer with exceptional capacity and performance capabilities for use mainly in engineering, design and audiovisual applications demanding immediate access to data and the ability to manipulate it in technically sophisticated ways.

The recording of flux reversals onto the magnetic surface of a disk.

Write Cache
High speed RAM used to buffer data transfer from the host to the hard drive.

Write Verify
Immediately after writing data to the disk, a drive with the Write Verify feature will verify that it can read the data it just wrote to the disk to ensure that it will be able to retrieve it later. If the drive is unable to read the data, it writes it to another area of the disk, where it attempts to write verify it again.

Data Recovery Glossary (Letter V)

February 8th, 2010 Comments off

Virus Scanner
Software that is used to scan for and eradicate computer viruses, worms, and Trojan horses.

Viterbi Detection
An algorithm used in read channel technology that detects an entire sequence of data bits at a time and determines the most likely sequence of data bits by comparing actual sequence of data bit samples with sequences of possible data bit sample to accurately detect that data written to disk.

Voice Coil
An actuator motor; the force of the magnetic rotary voice coil produces a movement of the head that is proportionate to the force exerted by the coil.

A portion of a physical disk that functions as though it were a physically separate disk.

Data Recovery Glossary (Letter U)

February 5th, 2010 Comments off

Ultra SCSI
Provides 20 MB/s transfers over an 8-bit bus or 40 MB/s transfers over a 16-bit Wide SCSI bus. Also known as Fast-20 SCSI, this feature is most commonly found in SCSI-3 drives.

Ultra DMA/33
A high-speed host data transfer feature that transfers data at 33.3 MB per second.

Un-correctable Error
An error that cannot be overcome using Error Detection and Correction.

Unformatted Capacity
The total number of usable bytes on a disk, including the space that is required to record location, boundary definitions, and servo data. (See also formatted capacity.)

Universal Serial Bus (USB)
A serial bus with a bandwidth of 1.5 megabits per second (Mbps) for connecting peripherals to a microcomputer. USB can connect up to 127 peripherals, such as external CD-ROM drives, printers, modems, mice, and keyboards, to the system through a single, general-purpose port. This is accomplished by daisy chaining peripherals together. USB supports hot plugging and multiple data streams.

Unrecoverable Error
A read error that cannot be overcome by an ECC scheme or by rereading the data when host retries are enabled.

Untagged Queuing
The ability of the drive to receive a maximum of one I/O process from each initiator.

In hard drives, the replacement of a hard drive with one offering greatercapacity or performance, or both.

Data Recovery Glossary (Letter T)

February 4th, 2010 Comments off

TPI (Tracks per inch)
The number of tracks written within each inch of the disk’s surfaces, used to measure how closely the tracks are packed on a disk surface. Also known as track density.

Tagged Queuing
The ability of the drive to receive multiple I/O processes from each initiator.

Task File
The set of I/O Host Interface Registers used to transfer status, commands, and data between the host and the drive for the EIDE interface.

Thin Client Architecture
A computer system in which data is stored centrally, with only limited storage capacity at the various points of use.

Thin Film
A type of coating deposited on a flat surface through a photolithographic process. Thin film is used on disk platters and read/write heads, as well as on the write element of MR heads.

Thin-Film Inductive Head (TFI)
A head technology that uses a thin-film inductive element to read and write data bits on the magnetic surface of the disk.

Getting to market first with the next highest capacity hard drive.

The time it takes to bring a product from concept to market. Generally first-to-market is the desired time-to-market goal.

The time required to bring a new product to market with the best possible level of quality and reliability.

The time required to begin producing a new product in sufficiently high volume to fill commercial requirements.

A concentric magnetic circle pattern on a disk surface used for storing and reading data.

Track-to-track Seek Time
The time that elapses when the read/write heads move from one track to an adjacent track.

Transfer Rate
The rate at which the hard drive sends and receives data from the controller. Processing, head switches, and seeks are all figured into the transfer rate in order to accurately portray drive performance. The burst mode transfer rate is separate from transfer rate, as it refers only to the transfer of data into RAM.

Translating BIOS
A system BIOS that allows access to EIDE drives larger than 528 MB.