Diskette-based diagnostics – Dell PowerEdge 6400 User Manual
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diskette-based diagnostics
A comprehensive set of diagnostic tests for your Dell computer. To use the diskette-based diagnostics, you must boot your computer from the Dell
Diagnostics Diskette. See your Installation and Troubleshooting Guide for a complete discussion about how to use the diskette-based
diagnostics.
display adapter
See
.
DMA
Direct memory access. A DMA channel allows certain types of data transfer between RAM and a device to bypass the microprocessor.
DOC
Department of Communications (in Canada)
dpi
dots per inch
DPMS
Display Power Management Signaling. A standard developed by the Video Electronics Standards Association that defines the hardware signals
sent by a video controller to activate power management states in a video display or monitor. A monitor is said to be DPMS-compliant when it is
designed to enter a power management state after receiving the appropriate signal from a computer's video controller.
DRAC
Dell Remote Assistant Card
DRAM
Dynamic random-access memory. A computer's RAM is usually made up entirely of DRAM chips. Because DRAM chips cannot store an electrical
charge indefinitely, your computer continually refreshes each DRAM chip in the computer.
drive-type number
Your computer can recognize a number of specific hard-disk drives. Each is assigned a drive-type number that is stored in NVRAM. The hard-disk
drive(s) specified in your computer's System Setup program must match the actual drive(s) installed in the computer. The System Setup program
also allows you to specify physical parameters (cylinders, heads, write precomp, landing zone, and capacity) for drives not included in the table of
drive types stored in NVRAM.
DS/DD
double-sided/double-density
DS/HD
double-sided/high-density
DTE
Data terminal equipment. Any device (such as a computer system) that can send data in digital form by means of a cable or communications line.
The DTE is connected to the cable or communications line through a data communications equipment (DCE) device, such as a modem.
E
ECC
error checking and correction
ECP
Extended Capabilities Port