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Dedicated Servo A technology in which timing or positioning signals are located on a dedicated disk containing no user data. These signals provide the information the actuator needs to fine-tune the position of the read/write heads.
Defragment As modern file systems are used and files are deleted and created, the total free space becomes split into smaller non-contiguous blocks. Eventually new files being created, and old files being extended, cannot be stored each in a single contiguous block but become scattered across the file system. This degrades performance as multiple seek operations are required to access a single fragmented file.
Defragmenting consolidates each existing file and the free space into a contiguous group of sectors. Access speed will be improved due to reduced seeking. A nearly-full disk system will fragment more quickly. A disk should be defragmented before fragmenting reaches 10%.
Directory This is an index into the files on your disk. It acts as a hierarchy, and you will see them represented in Windows looking like manila folders.
DMA Stands for direct access memory. DMA is a fast way of transferring data within a computer. Most devices require a dedicated DMA channel (so the number of DMA channels that are available may limit the number of peripherals that can be installed).
DRAM Dynamic Random Access Memory (see also SDRAM). A type of memory used in a PC for the main memory (such as your "32 Mbytes of RAM".) "Dynamic" refers to the memory's memory of storage - basically storing the charge on a capacitor. Specialized types of DRAM (such as EDO memory) have been developed to work with today's faster processors.
Driver A program designed to interface a particular piece of hardware to an operating system or other software.
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