2024-12-23

Ultra ATA

Glossary of Samsung Hard Disk Drive (Letter A)

DATARECOVERYUNION.COM03 mins

Acoustic Noise
The level of sound the drive produces while operating, the smaller the number,the better

Access
The level of sound the drive produces while operating, the smaller the number,the better

Access time
Access time measures the time lapsed between the access command and the point in time where the head is positioned to read or write a specific sector (address), measured in milliseconds (ms). (The access time for HDDs is a combination of seek time, controller overhead, and rotational latency, i.e. time taken for desired sector to rotate under head for access)

Actuator
The mechanism that moves the head(s) to the correct cylinder. It generally comprises of two parts; a rotary voice coil and head gimble assembly. The actuator arm houses the head at the tip of its arm

Address
Assigning certain areas of a disk to particular data

Areal Density
Bit density; Bits per Inch (BPI) x Tracks per Inch (TPI). This reflects how dense the data is stored on the media of the HDD

ATA-3
Fast ATA (E-IDE), PIO Mode 4, S.M.A.R.T., Simple password, more sophisticated power management

Atapi
ATA packet interface, a communications protocol which allows the electronic controllers for IDE hard disk drives to handle up to four devices, including CD-ROMs and tape drives and tape drive, Atapi devices plug into the IDE Interface

Ultra-ATA
Merge of ATA-3 and Atapi into one, Strong command overlap

Ultra-ATA
A new, even higher performance Ultra DMA (transfer rate of 66 MB/s)

AV
Audio Visual. AV drives denotes drivers modified to enhance transfer rate performance for specific applications

Average Latency
The average amount of time it takes for the drive to rotate to the correct address, so that the head can begin reading or writing in its desired location (is derived from the spindle speed)

AVI
Audio video interleaved. A standard system, form Microsoft, for integrating sound and vision for Windows into a single file for hard disk or CD-ROM

Average Seek Time
The average time for a head to seek the address, calculated over a large number of random seeks

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Glossary of Western Digital Hard Disk Drive (Letter U)

DATARECOVERYUNION.COM04 mins

Ultra ATA
A high-speed host data transfer feature that transfers data at up to 133 MB per second. See also Ultra DMA.

Ultra DMA
A protocol for transferring data between a hard drive through the bus to the computer’s RAM. Also known as Ultra ATA, Ultra ATA/66, Ultra ATA/100, and Ultra ATA/133.

Ultra/150 CQ
A technology that optimizes the sequence of data transfers from the host to the hard drive, providing increased data transfer efficiency and resulting in higher performance for enterprise applications.

uncorrectable 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.

unrecoverable error
A read error that cannot be overcome by an ECC scheme or by re-reading data when host retries are enabled.

untagged queuing
The ability of a drive to receive a maximum of one input/output (I/O) process from each initiator.

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

UPnP
Universal Plug n Play. A set of computer network protocols that simplify the implementation of networks in the home by allowing devices to connect seamlessly. See also protocol.

UPnP NAT traversal
Combines UPnP and NAT features.

UPS
Uninterruptable Power Supply. A standalone device that provides secondary power to connected equipment in the event of a power failure.

USB
Universal serial bus. A serial bus for connecting peripherals to a microcomputer. It connects external drives, printers, modems, mice, keyboards, etc., through a single, general-purpose port. It can automatically add and configure new devices without having to shut down and restart the system.

USB 2.0
Hi-Speed USB (USB 2.0) supports data transfer rates up to 480Mb/s. USB 2.0 is backward-compatible with USB 1.1. If you connect to a USB 1.1 device, data is transferred at USB 1.1 speed (up to 1.1 Mb/s).

USB 3.0
SuperSpeed USB (USB 3.0) supports data transfer rates of up to 5 Gb/s. USB 3.0 is backward-compatible with USB 2.0. If you connect to a USB 2.0 device, data is transferred at USB 2.0 speed (up to 480 Mb/s).

USB 3.0 HBA adapter
WD’s USB 3.0 PCI adapter card. Allows users to upgrade their PC to take advantage of the faster data transfer speeds available through the SuperSpeed USB 3.0 port.

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