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Glossary of Samsung Hard Disk Drive (Letter A)

October 4th, 2010

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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