PXE (Pre boot Execution Environment): one of four components that together make up 
the Wired for Management 2.0 baseline specification. PXE was designed to define a 
standard set of preboot protocol services within a client, towards the goal of allowing 
networked based booting to boot using industry standard protocols. 
RAID (Redundant Array of Independent Disks): a way for the same data to be stored in 
different places on many hard drives. By using this method, the data is stored redundantly, 
also the multiple hard drives will appear as a single drive to the operating system. RAID 
level 0 is known as striping, where data is striped (or overlapped) across multiple hard 
drives, but offers no fault tolerance. RAID level 1 is known as mirroring, which stores the 
data within at least two hard drives, but does not stripe. RAID level 1 also allows for faster 
access time and fault tolerance, since either hard drive can be read at the same time. 
RAID level 0+1 is both striping and mirroring, providing fault tolerance, striping, and faster 
access all at the same time. 
RAIDIOS: RAID I/O Steering (Intel)  
RAM (Random Access Memory): technically refers to a type of memory where any byte 
can be accessed without touching the adjacent data, is often used to refer to the system's 
main memory. This memory is available to any program running on the computer. 
ROM (Read Only Memory): a storage chip which contains the BIOS; the basic 
instructions required to boot the computer and start up the operating system. 
SCSI Interrupt Steering Logic (SISL): Architecture that allows a RAID controller, such 
as AcceleRAID 150, 200 or 250, to implement RAID on a system board embedded SCSI 
bus or a set of SCSI busses.  SISL: SCSI Interrupt Steering Logic ( LSI )  (only on LSI 
SCSI boards) 
SDRAM (Synchronous Dynamic RAM): called as such because it can keep two sets of 
memory addresses open simultaneously. By transferring data alternately from one set of 
addresses and then the other, SDRAM cuts down on the delays associated with non 
synchronous RAM, which must close one address bank before opening the next. 
SRAM (Static RAM): unlike DRAM, this type of RAM does not need to be refreshed in 
order to prevent data loss. Thus, it is faster and more expensive. 
Serial ATA: Often abbreviated SATA or S ATA, an evolution of the Parallel ATA physical 
storage interface. Serial ATA is a serial link    a single cable with a minimum of four wires 
creates a point to point connection between devices. Transfer rates for Serial ATA begin 
at 150MBps. One of the main design advantages of Serial ATA is that the thinner serial 
cables facilitate more efficient airflow inside a form factor and also allow for smaller 
chassis designs. In contrast, IDE cables used in parallel ATA systems are bulkier than 
Serial ATA cables and can only extend to 40cm long, while Serial ATA cables can extend 
up to one meter. 
Serial port: Called such because it transmits the eight bits of a byte of data along one 
wire, and receives data on another single wire (the data is transmitted in serial form, one 
bit after another). 






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