SCSI

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작성자닥쳐 조회 69회 작성일 2021-11-29 19:09:48 댓글 0

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SCSI

In this video from ITFreeTraining, I will look at the Small Computer System Interface or SCSI. SCSI has been around since the 80’s, however it is being replaced by other standards like SAS which I will look at later in the video. Although SCSI is not used in new computers nowadays, it is important to have a basic understanding of it if you are repairing old equipment.

Download the PDF handout: http://itfreetraining.com/handouts/ap/1c45.pdf

SCSI
0:22 SCSI stands for Small Computer System Interface. As the name suggests, it is an interface designed to connect devices to a computer. SCSI has different levels of success in the marketplace and is fundamentally used to connect hard disk drives to computers. However, it could also be used to connect other devices to computers, like optical drives and scanners.

Computers sold on the market today no longer use the SCSI interface. Later in the video, I will look at how SCSI has changed and where you may encounter it today. For the exam, it is good to have an understanding of how SCSI is used today. For the technician, it is good to have a basic understanding, in case you have to fix an old computer that still uses SCSI. To start with, I will have a look at how SCSI works, so you can understand why it was used in the marketplace.

Parallel
1:10 The SCSI interface uses parallel technology. So essentially this means that multiple bits are transferred at once in sync with each other. You may be thinking that there were a lot of other interfaces that also transferred data in parallel, so what made SCSI different?

SCSI generally transferred data faster than its competitors. Although there are many different versions of SCSI which have different speeds, let’s consider an example of what sorts of speeds we are looking at, compared with a competitor.

Back in the 90’s, SCSI was transferring data at 320 Mega Bits per second whereas IDE was transferring at 133 Mega Bits per second. There were different versions of each which ran at different speeds, however this will give you an idea what speeds were available at the time. The main take away is that SCSI ran faster than the competing products. This extra speed cost more money to implement, and thus SCSI devices cost more than their competitors.

Due to the higher cost, SCSI devices tended to be used on high-end workstations and servers. Some manufacturers like Apple used them for a while. Essentially, in the old days, if you wanted more performance you would get SCSI; however, you would pay more for it.

SCSI Connectors
2:26 There were many different versions of SCSI over the years. Each version of SCSI offered increased speed, and with the different versions came many different connectors. You can see some of the connectors that SCSI uses. There are too many to go through and there is not much point learning them since SCSI is not used in new computers any more. If you are fixing a computer and see a connector like one of those shown, you are probably working with SCSI.

It is unlikely that you will get tested on the old SCSI technology in the exam, but I will go through some basic things so you will have an idea how to support it if you come across it.

Description to long for YouTube. Please see the following link for the rest of the description. http://itfreetraining.com/ap/1c45

References
“The Official CompTIA A+ Core Study Guide (Exam 220-1001)” Chapter 3 Position 11012-11292
“CompTIA A+ Certification exam guide. Tenth edition” Page 303
“Picture: External SCSI Connectors” http://www.scsi4me.com/scsi-connectors.htm
“Picture: Picture of rear of SCSI device” https://en.wikipedia.org/wiki/File:Scsi-1_gehaeuse.jpg
“Picture: SCSI terminator ” https://commons.wikimedia.org/wiki/File:SCSI_Terminator_50pol_Centronics.jpg
“SCSI (Small Computer System Interface)” https://www.linktionary.com/s/scsi.html
“Picture: SAS Connector” https://commons.wikimedia.org/wiki/File:SFF-8484-internal-connector-0a.jpg

Credits
Trainer: Austin Mason http://ITFreeTraining.com
Voice Talent: HP Lewis http://hplewis.com
Quality Assurance: Brett Batson http://www.pbb-proofreading.uk
Sokret Heng - ហេង សុក្រិត : Wow, Fantastic. What do you think in this videos, everyone?
Frank Lucas : can you daisy chain a scsi jaz 1G off of a zip 100?
bloeder hennes : I generally asking me from where the "A" came into the pronouncing ? Small Computer System Interface...... SC "A" SI ? ;)
Rajesh Parjapat : Hi sir

Please upload videos for cloud.
jhon cadena : i have an energy meter, uses floppy with scsi 26 pins, i don't know how can i adapt that to an emulator floppy, to use an sd or usb flash,

Understanding SCSI - CompTIA A+ 220-801: 1.5

CompTIA has RETIRED the 220-800 A+ exam series!
See NEW CompTIA A+ videos: http://professormesser.link/freeaplus

A+ Training Course Index: http://professormesser.link/220900
Professor Messer’s Course Notes: http://professormesser.link/900cn
Frequently Asked Questions: http://professormesser.link/faq
- - - - -
The SCSI standard has been around for a long time, and it's now finding new life due to virtualization technologies. In this video, you'll learn about the SCSI standard and how SCSI devices are configured and connected together.
- - - - -
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onetamer : This video is really well made! Very clear presentation, concise with lots of information. Thank you!
Jeremy Potter : Thank you!!! I love the detail and explanation you put into your videos. The COMP TIA A+ training I purchased from another provider barely scratches the surface compared to your videos. I wish i would have found your video and material first!
Matthew Nicassio : Hey, I'm watching your 801/802 series as a visual and audio addition to Mike Meyers' 8th edition book. I appreciate that there are already differences. That gets me thinking though. Are EITHER sources (if you know the Meyers text) comprehensive enough to take the CompTIA 220-801/802 cert?
Can I pass the test using just your vid series? That's my main question.
Thank you for making this available!
tyrone taylor : Professor Messer you're the man. I read 4 books last year about the CompTIA A+ cert and non of them had anything about SAS drives. You the man!!!
Ahmad Zia : Thanks, Professor Messer . the way you are teaching is totally understandable. Thanks again

SCSI Drive Cables - CompTIA A+ 220-1001 - 3.1

Core 1 A+ Training Course Index: https://professormesser.link/1001course
Core 1 A+ Success Bundle: https://professormesser.link/1001success
Core 1 Course Notes: https://professormesser.link/1001notes
Core 1 Practice Exams: https://professormesser.link/core1pe
Discount exam vouchers: https://professormesser.com/vouchers/
- - - - -
SCSI interfaces have been around for many years, and the standard has continued to evolve through the years. In this video, you’ll learn about traditional SCSI connections and the newer serial attached SCSI standard.
- - - - -
Subscribe to get the latest videos: http://professormesser.link/yt
Calendar of live events: http://www.professormesser.com/calendar/

FOLLOW PROFESSOR MESSER:
Professor Messer official website: http://www.professormesser.com/
Twitter: http://www.professormesser.com/twitter
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Scally Wag : Pro Level Information, Well explained. I Like it!
KCO : been watching since 1.1 and forgot to thank you THANK YOU
I CHENG LIN : What will happen to the hard drive if you leave the Terminate on the last hard rive(without the physical terminator) @ 4:04 Will i lose my storage data?
Sam : Anyone know what the difference is between a parallel and serial SCSI is?
funtimes S : Is there anyway I can format SCSI drive not plugged into a computer. Like a SCSI drive bay available?

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#SCSI

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