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14 Dell PowerEdge 4350 Systems Users Guide
substantially faster than DRAM chips.
SRAM is used mostly for external cache
memory.
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In composite drivers with two or more
physical drives, the drive array sub-
system uses a method of data storage
called
striping
. With this method, data is
divided into a series of pieces called
blocks
and each data block is stored on a
different physical drive. When each drive
contains a block of data, the process
starts over with the first physical drive.
By carefully selecting the size of the data
block, the chance that the information
needed can be read from or written to
multiple physical drives at once is
increased, greatly increasing the perfor-
mance of the composite drive. See also
block, block size, and RAID.
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Abbreviation for super video graphics
array. See also VGA.
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See parameter.
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Sync negotiation is a SCSI feature that
allows the host adapter and its attached
SCSI devices to transfer data in synchro-
nous mode. Synchronous data transfer is
faster than asynchronous data transfer.
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The rules that dictate how you must type
a command or instruction so that the com-
puter will understand it.
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As the main circuit board, the system
board usually contains most of your com-
puters integral components, such as the
following:
Microprocessor
RAM
Expansion-card connectors
Controllers for standard peripheral
devices, such as the keyboard
Various ROM chips
Frequently used synonyms for system
board are
motherboard
and
logic board
.
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System diskette is a synonym for
bootable
diskette
.
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System memory is a synonym for
RAM
.
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System Setup program options allow you
to configure your computers hardware.
Some options in the System Setup
program require that you reboot the
computer in order to make a hardware-
configuration change. Because the
System Setup program is stored in
NVRAM, any options that you set remain
in effect until you change them again.
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When you start Windows, it consults the
system.ini file to determine a variety of
options for the Windows operating
environment. Among other things, the
system.ini file records which video, mouse,
and keyboard drivers are installed for
Windows.
Running the Control Panel or Windows
Setup program may change options in the
system.ini file. On other occasions, you
may need to change or add options to the
system.ini file manually with a text editor,
such as Notepad.
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Some devices, especially disk drives, con-
tain a terminator to absorb and dissipate
excess current. When more than one
such device is connected in a series, you
may need to remove the terminatoror
change a jumper setting to disable it
unless it is the last device in the series.
However, some devices have terminators
that should never be removed or disabled.
3502Ebk0.book Page 14 Friday, November 13, 1998 10:00 AM