Understanding SCSI
Tamara M.Harahsheh
Laptop Battery SCSI,IDE,EIDE all describes the interface between the disk and the computer. The following is a brief description of SCSI.
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Thinkpad Almost everyone with computer experience has heard of SCSI ,this describe a standard interface and command set for transferring data between devices on a computer bus.
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Microsoft Let's get more specific:
History
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Laptop Computers In 1981,SCSI was developed by "Shugart Association", which introduced Shugart Association System Interface (SASI)in conjunction with NCR corporation. In 1986, a modified version of SASI was ratified by American National Standard Institute (ANSI)as SCSI.
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Laptop Computer SCSI: What? Why?
How many internal Parallel SCSI (U320) hard drives do you need How many internal Serial SCSI (SAS) hard drives do you need Please select 1 or 2 up to 4 up to 6 up to 8 up to 16 up to 18 Please answer the questions on the left to identify which server is most suited to your needs. While you answer the questions our hp server selector will match the right server to you requirements. Choose one of the servers to , to return to the configurators page or contact us on 0800 0830 646.
Desktop Computer SCSI (Pronounced "skuzzy"),which is acronym for Small Computer Systems Interface ,is a standard parallel interface between computers and peripheral devices such as hard drives ,scanners ,CD-ROM/RW drives ,tap drives ,printers.etc .
The technology allows you to connect various devices to your PC or PC server ,using SCSI card that fits inside your machine. SCSI bus is completely separated from the usual bus ,such as IDE,ISA,PCI.SCSI is completely independent from computer.
SCSI hard disks are very commonly found in RAID array, workstations, servers, and high-end peripherals while ,desktop computers and notebooks more typically use the ATA/IDE interface for hard disks.
Notebooks Why we use SCSI? Quite simple, it is used because it speeds up the computer. Expandability ,flexibility ,performance, ease to use, and maturity are additional great reasons why SCSI has the popularity in computer marketplace. There are no set standard SCSI, originally SCSI-1,SCSI-2 which sometimes have a hard time talking to each other. Also, some companies have developed SCSI standards which may not be able to talk with other SCSI standard. All may bring problems to the system.
Lenovo SCSI basics
Hard Drive 1. SCSI can connect multiple devices to single SCSI adaptor on the computer bus.
2. SCSI is a parallel interface.
3. SCSI can operate in either synchronous or asynchronous modes.
4. There must be at least one target and one initiator on the SCSI bus.
5. SCSI can support up to 25 meters of cable.
Travelstar SCSI System Components
Gateway The basic component in the SCSI system :
Laptop Parts 1. controller" Host Adapter": It serves as the interface between all the other devices on SCSI bus and computer.
2. Device.
3. Cable.
4. BIOS: on the controller is the SCSI BIOS ,that is a small ROM or flash memory chip that contains the software needed to gain access the control devices on SCSI.
Software SCSI Termination
Hard Drives SCSI buses must be terminated in both ends. There are four ways to terminate:
1. Internal.
2. External.
3. Passive.
4. Active.
Electronics Terms In SCSI System
Canon 1. Embedded SCSI Derives: That is a device with an adapter built in. This adapter allows the device to interface and communicate with the SCSI bus.
2. Identifier(ID):The ID ranges from 0-7 in SCSI system that supports eight devices. and ranges from 0-15 for 16 devices support.
3. SCSI Configured Automatically (SCAM):The auto-selection capability in most plug and play SCSI cards.
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Repair Tamara M. Harahsheh
Mutah University/Jordan
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