Self SEO Store  
SEO forum
Website templates  
Flash templates  
Articles archive
Submit your article

Register
Login

Search
XML news feeds
Free RSS news reader
Contact
Advertising  

Best hosting reviews.
Free Internet & IT Magazines.





The Affiliate Marketers Toolkit - Master Resell Rights

This incredible tool is actually 3 tools in one, and they’re the quickest and easiest way to affiliate market. Inside this magnificent tool is absolutely everything you need to start increasing your click rate and raking in the big bucks!

Only $4.95

Alexa Rank Checker
Check Google Pagerank
Domain Typo Generator  
Google Pagerank Prediction
Google ban check  
Link Popularity Checker
Keyword Suggestion Tool
Keyword Misspelling  
Search engine ranking report
Number of pages indexed

Find IP address of a website
Find host by IP
HTTP Headers Check
International WHOIS
IP to country
Ping test
Server Status Check
What is my IP ?
Your browser details  

HTML Optimizer
HTML Source Viewer
Link Extractor
Search engine spider simulator
Meta tags Generator
Meta tags Extractor
Website speed test

Coming soon ...

Affiliate Marketing
Anti Spam
Blogging
Copywriting
Domain Names
Ebay Tips and Tricks
E-Books
E Commerce
Email Marketing
Google Adsense
Hardware
Internet
Internet Connections
Internet Marketing
Internet Security
Link Popularity
Newsletters
Online Promotion
Personal Tech
Podcasting
Pay Per Click
RSS
Search Engine Optimization
Search Engines
Software
Streaming Media
Traffic Building and Analysis
VoIP
Web Hosting
Web Design
Web Development
Webmaster Tips

Understanding SCSI

---

Self SEO > Hardware Articles


Understanding SCSI
Tamara M.Harahsheh

SCSI,IDE,EIDE all describes the interface between the disk and the computer. The following is a brief description of SCSI.

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.

Let's get more specific:
History

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.

SCSI: What? Why?

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.

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.

SCSI basics

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.

SCSI System Components

The basic component in the SCSI system :

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.

SCSI Termination

SCSI buses must be terminated in both ends. There are four ways to terminate:
1. Internal.
2. External.
3. Passive.
4. Active.

Terms In SCSI System

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.

Tamara M. Harahsheh
Mutah University/Jordan

Print this article    Tell a friend

Understanding The DVD Drive
Recognize And Understand Home Networking Components
Understanding the IRM/MRP Analogy
Metrology: Getting An Understanding That You Need
Understanding Flow Control
Understanding the Components of a Home Network
Finally... An Understandable Introduction To Computers
Finally... An Easy To Understand Introduction To Computers

This site does not allow anonymous comments. Registered members can login to participate. Registration is free and takes only a few seconds