Understanding SCSI - CompTIA A+ 220-801: 1.5

CompTIA has RETIRED the 220-800 A+ exam series!
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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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[@phoenixrising164]

Now this is called teaching! Thank you Professor Messer.

[@onetamer]

This video is really well made! Very clear presentation, concise with lots of information. Thank you!

[@tyronetaylor7718]

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!!!

[@Ahmad19903]

Thanks, Professor Messer . the way you are teaching is totally understandable. Thanks again

[@rickysandhu3916]

Simply speechless. Thank you!

[@jusbejusbe7838]

Very informative, thank you!

[@pot582]

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!

[@asadmehmood3518]

Excellent tutorial Thank you.

[@xRolex]

Thank you, these videos are brilliant.

[@Time4Technology]

Thank you! Very well explained!

[@rOnNiecHaRles16]

THANK YOU!!! VERY DEAILED, I HAVING PROBLEM TO UNSDERSTAND THIS TOPIC.

[@spinabbus7059]

Nice explanation.cheers🤞👌

[@TheWordprophet]

I just studied about SCSI interfaces in the "A+ Complete Study Guide"...and I didn't understand it until just now. Thank you for this video. Great job with the explanation and photos...

[@alanthomas7182]

TheWordprophet can you please a what is a scsi bus

[@AbhishekBhardwaj04]

Very well explained... Thanks .. !!!

[@Exen88]

You have to always terminate the signal at the end of the connection. You can do so by manually setting the jumper/switch/button to "Terminate"on the SCSI device that is at the end of the connection. Most devices have built-in termination which does the work of setting itself to terminate should it be on end of the connection. Others have to be set manually.

[@manondanon4860]

I have a background as a technician and doing electrical troubleshooting and this reminds me of things being wired in series. If one of the devices on the SCSI network is down will it interrupt the communications with other devices further down in the series? (Ex. 0 (host controller) 1 (scanner) 2 (optical drive)) would the scanner (SCSI ID 1) being down interrupt the communication with the optical drive (SCSI ID 2)?

[@MichaelCena08]

Ready to take the Server+ !!

[@macresourcesinc]

I would like to know if I can build a computer with a scsi hard drive . just one or 2 with raid 0

[@Hogvh]

Thank you ,

[@MattNicassio]

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!

[@adog3129]

was trying to figure out where i heard that name then remembered live action cat in the hat. probably not the same guy lol

[@Nalojuntu]

A french dude... who just learned that "daisy" means the "marguerite" flower ! : ) Internet is amazing : you learn things from the most unexpected places : D

[@said199785]

how to find those cables and what are the motherboard that have a scsi port can any one help me please i have a scanner and cant get the cable scsi 2 db50

[@jamesbeck3941]

tell you the truth I miss those day's it was fun with the jumpers on the mother boards and the hard drives you actually had to think

[@vincentcesca7162]

my comptia certmaster program is saying that its 7 and 15 devices for narrow and wide respectively??? are they wrong. i see another person is getting mixed info too, i just dont wanna screw up on my certification test so i wanted to check if you misspoke!

[@professormesser]

vincent cesca It depends on how you count. The SCSI IDs are 0-7 (8 devices) on a narrow bus and 0-15 (16 devices) on a wide bus. The SCSI adapter takes one of those IDs, leaving 7 available device IDs on a narrow bus and 15 available device IDs on a wide bus. It really just depends on whether you are counting the SCSI controller as a device.

[@vincentcesca7162]

oh okay that makes perfect sense!! thanks so much! and thanks for taking the time to make all these videos, they are incredibly helpful, and an awesome addition to my study material!

[@jerryku]

I miss SCSI because it was so fun to say. SCUZZY!!

[@PiotrK2022]

Or Scoosy, like Victor Bart ... lol

[@goodchildmusic0]

Awesome :D I use an Adaptec AHA-2940U with 2 Seagate Ultra 320 Cheetahs' for backup. I have been using them for the past 3 years and they have been the most reliable backup compared to IDE, SSD, SATA or USB storage (Not trying to slander the newest technology). These drives are more than 7 years old and they keep on chugging. They are quite loud though at 15000 RPMs. Every time I boot my PC, it sounds like it's going to take off in flight :D

[@stuartbaines2843]

Shawn Walker i have an old SCSI driven scanner which uses an Adaptec card i would like to Continue to use the scanner. Do you think its possible ? Where would i plugin the board? Cheers

[@qayyumzamman]

Anybody tell me scsi AHA-2940 driver windows 64bit

[@jamesbeck3941]

Mac's used mostly used scsi's if I remember right

[@Troegs]

Do you have yo terminate SCSI on the next available connection or the end of the cable.

[@antigen4]

at the END - nearly alawys

[@Exen88]

No. The ID can be assigned in any order from 0 - 15 in a single daisy-chain.

[@tyronetaylor7718]

It's a very long way from being gone. so you can say "SCUZZY" as many time as you would like to. Serial_attached_SCSI is up to 12Gb/s

[@limemason]

Almost hard to believe that's you compared to today XD