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11. References
Device Driver
A program stored on the hard drive that tells the operating system how to communicate with an
input/output device such as a printer. You may think of it as dedicated software that controls a
device such as a printer. To use a new peripheral device, the corresponding device driver must be
installed.
DIMM
Abbreviation for 'Dual In-line Memory Module'. The memory capacity is doubled by installing DRAM
chips on both sides of the memory module. This is similar to a combined 2 SIMM that uses only a
single side. This technology enables a larger capacity without increasing the number of memory
banks by utilizing both sides of the memory module.
Dot Pitch
An indication of the image quality of a monitor, this is the measurement of the distance in millimeters
between two phosphor dots, which is the minimum unit of a screen on a monitor. It determines the
minimum size of a dot on a monitor. The smaller the dot pitch the better the quality, since it allows
for more dots to be displayed and therefore a greater resolution. The dot pitch defines the resolution
of a monitor.
DRAM & SRAM
The highly integrated memory includes two memory devices: DRAM and SRAM. Although DRAM
requires power to maintain data, the circuit density and capacity of DRAM is much higher than
SRAM. The unit capacity, generally, is in MB.
DVD
Abbreviation for 'Digital Video Disk'. A DVD a large capacity media that can save up to 4.7GB of
data. Due to its high capacity, it is useful for storing multimedia data. The maximum capacity is
17GB and the data rate is between 600Kbps ∼ 1.3Mbps. Since a DVD-ROM drive is also compatible
with existing CD-R media, it will replace the CD-ROM drive in the future.
DVD-RAM
Abbreviation for 'Digital Versatile Disc-RAM'. A DVD media type that allows multiple data to be written
to a disk and can save up to 2.6GB, which is equal to 70 minutes of a DVD title or 1800 1.44MB
floppy disks.
DVD-R Media
A DVD media type that only allows data to be read. Although the basic capacity is 4.7GB, single-
side single-layer, single-side dual-layer, double-side single-layer and double-side dual-layer recording
types are supported. If a DVD disc is recorded via a double-side dual-layer recording, the capacity
increases by 4 times that of the single-side single-layer recording.
11-9
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