Dell PowerEdge 7150 - Manual (Page 32)

A read-only file is one that you are prohibited from editing or deleting. A file can have read-only status if: Its read-only attribute is enabled. It resides on a physically
write-protected diskette.
It is located on a network in a directory to which the system administrator has assigned read-only rights to you.
refresh rate
The frequency, measured in Hz, at which the screen's horizontal lines are recharged. A monitor's refresh rate is also referred to as its vertical frequency.
rpm
Abbreviation for revolutions per minute.
SCSI
Acronym for small computer system interface. An I/O bus interface with faster data transmission rates than standard ports. You can connect up to seven devices to one
SCSI interface.
SDRAM
Abbreviation for synchronous dynamic random-access memory.
SEC
Abbreviation for single-edge contact.
sec
Abbreviation for second(s).
sector
The fundamental unit of data access for a hard-disk drive. For PC-compatible systems, a sector is usually 512 bytes. See also block and block size.
SEL
Abbreviation for System Event Log.
serial port
An I/O port used most often to connect a modem or a mouse to your system. You can usually identify a serial port on your system by its 9-pin connector.
SMART
Acronym for Self-Monitoring Analysis and Reporting Technology. A technology that allows hard-disk drives to report errors and failures to the system BIOS, which
then displays an error message on the screen. To take advantage of this technology, you must have a SMART-compliant hard-disk drive and the proper support in the
system BIOS.
SNMP
Abbreviation for Simple Network Management Protocol.
striping
In composite drives with two or more physical drives, the drive array 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. When the size of the data block is carefully selected, the chance that the information needed can be read from or written to multiple physical drives at once is
increased, greatly increasing the performance of the composite drive. See also block, block size, and RAID.
SRAM
Abbreviation for static random-access memory. Because SRAM chips do not require continual refreshing, they are substantially faster than DRAM chips. SRAM is
used mostly for external cache memory.
SVGA
Abbreviation for super video graphics array. See also VGA.
switch
See parameter.
system board