BIOS, CMOS, UEFI - What's the difference?
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- Опубликовано: 6 сен 2018
- This video explains the difference between the BIOS, CMOS, and UEFI. It also explains what the purpose of the CMOS battery. What is the BIOS? What is UEFI? What is CMOS?
#BIOS #UEFI #CMOS
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I like how these videos are at a steady pace and explained thoroughly. Better than some college courses.
FINALLY. Someone who actually explained the difference between these three. Thank you so much.
Well, after decades of working with computers i finally now understand difference between BIOS and CMOS as well recognise what is the UEFI vs thinking it too is the BIOS. Your video's man does wonders for learning and relearning what we thought we learned. Since i just bought a new Motherboard for my first personal build, i decided to brush up on my PC Motherboard knowledge. I just came straight to PowerCert for clear concise well explained videos.
Please don't stop uploading videos 👍❤
Approved
I concur
Yup Agreed !!!
😂😂😂
And if ya do stop? You'll regret it, young man. Oh, my goodness..you WILL regret it 😡
A wonderful refresher of terminology and definitions before my job interview. Thank you for uploading. Great job on narration, animation and subject value.
Another great episode. I really appreciate these short tutorials - they are excellent. Thanks!
Hi
I just today found your tutorial , and I give you a big thumbs up , I have never found a tutorial like yours. It explains so ,so well , and the animation makes it very easy to understand.
Absolutely agree
Agree 1000%
I give you a big thumbs up too
It really is very nice and concise
I NEED these videos. You are amazing! I am a visual learner and you are THE BEST thus far. Keep them coming because i am watching them ALL! thank you so much. 👌🏾
Thank you.
Good morning. I can’t believe I’m years late replying to this. Do you have any idea how great this video is? Wow. Extremely informative. I’m scoring 850-852 in a test from 650-960. And the BIOS does come up a lot. This video has make me see more clearly now. I can’t wait to watch your other videos. Thank you kindly for making this video. 🙏🏻
Completely forgotten stuff ..... thank you for my memory refreshing. If you are not working on a daily basis with computers ..... you are not worried about this part of computing - right ?? Once in a while is a good idea to refresh your basic knowledge about your computing machine. Thank you very much for a short AND simple technical language class :o)) TWO THUMBS UP !!
OK! I enjoyed all of the brief details that was mentioned about BIOS and UEFI differences as we are all here to help each others to know more about computers and glad that a channel have some info like this. Keep going and way to go.
EXCELLENT tutorial ! So well explained ... straight to the point, no silly "jokes". Very impressive. I don't believe in subscribing to anyone's channel, but yours is so good that I had to ... you are my 2nd subscription :)
Channels like these are becoming quite rare... Keep up the good work! Worthy of more likes and subscriptions...!
Thank you :)
The most important difference between (legacy) BIOS and UEFI is the way of organising the boot process. For UEFI there was an EFI boot partition introduced where boot loader data for various operating systems are stored. This way it is easier to build and maintain multihomed PCs (with multiple OS installed).
ahhh thanks....try to read several articles and still confuse between bios and cmos chip......but seeing your video clear the doubts....your video is the best....thank you very much.
You are life saviour! I could understand it on the fly whereas i literally struggled with Mr.Meyers book!But one thing can be sure of is, if someone studies Meyers book and this channel.This is a powerful combo!
For someone new uefi surely looks less scary, but for us who have used bios for a long time having a mouse or colors is not very important
if you watch the video you'll notice that colours and a mouse isn't the only thing a UEFI has instead of a BIOS
i still use a keyboard to navigate :)
I like the fan control that the UEFI can support.
Boz 2011 That’s not the only difference and stop trying to show off, nobody cares how much of a nerd you are. UEFI is better, period.
Zoid Burg SHUT UP
UEFI is just BIOS with mouse and graphic and maybe more feature.
BuT hAvE yOu HeaRd Of
mAnUal BiOs
What you call the "CMOS chip" is the real-time clock. A clock needs to run constantly, which is why it has its own power supply (the battery). The manufacturer of the original clock chip included 44 bytes of storage. This was powered by the same battery. This is where your "settings" are stored. "Clearing CMOS" means clearing these bytes of RAM.
I am new to IT and your tutorial finally made me understand the difference between BIOS, CMOS and UEFI. SMASHING!!!
This channel is one of the best that I have ever come across on RUclips. I really enjoy listening to every single word that I hear. Thank you very much for taking the time to make them. A+ 👍😊👍
If there are no beeps, there will be a beep code.
.....Keyboard error. Press any key to continue.
OK. But where the h*ll is the 'any' key? 🤔
@@eknaap8800 try turning your keyboard over and checking the underside for the any-key.
@@fraydizs7302 Nope, there's isn't one either...🥴
No beebs could be GPU failure.
@taranTula leGos So that would be the 'any space bar'? 🤔
Thanks for the lesson, I think you did a great job on explaining the differences of each 1 and I think I will subscribe to your channel :)
Great video, I have been reading a chapter in the A+ book and then watching youtube videos, just to get it in my head a bit better. This is the first of your videos I have found so far, but it was well done and just the type of review for after reading I was looking for.
You cleared all my doubts in a few minutes with your good explanation. Keep up your good work. Thanks a lot
There actually were CMOS systems in mid-late 1990s with graphical UIs and mouse support - notably WinBIOS from American Megatrends that resembled Windows 3.x. I remember working on a Nx586 based system with this around 1996.
K
Here w.e go.love you. Wolf
I remember seeing a few of those
The computer speaker may actually be set to "off" by default in some UEFI configurations (I had to turn mine on, for example). There were older BIOSes that enabled mouse devices, btw. This is a good video to explain the differences, especially with Micro$oft's ridiculous Windows 11 system requirements for UEFI and Safe Boot. People will be very confused about needing those things.
@@michaelcook5585 It could also be that your computer cannot generate beep codes. My current computer has no audible codes because it has no built-in speaker, but there are 4 tiny LEDs on the motherboard that light up at the beginning of P.O.S.T. and turn off off as the CPU, memory, disply, and storage subsystems pass the test.
Respectfully, Jim Maloney wrote "Safe Boot" where I think he intended to refer to Secure Boot. "Safe Boot" is not actually the same term; it has historically referred to an option for starting Windows with many feature and options disabled, for the purpose of troubleshooting or getting Windows running after a driver update or setting change caused it not to run (so that you could back out the offending change).
FK the beeb bro switch it off
This is the best introductory video on this topic, thanks for uploading!
Hands down the best video on RUclips explaining the BIOS/CMOS/UEFI. I especially like your videos because they are in english; not some Indian dialect.
Very helpful. I built my first computer and installed a motherboard that runs UEFI. The UEFI is certainly a game changer, makes things easier to handle and seems to boot up faster. Its come a long way since the BIOS age.
I hope these are hardware or are the software?
Software
ONCE AGAIN A GREAT AND SIMPLIFIED WAY OF EXPLAINING CMOS, UEFI, AND BIOS ....... #TEACHER
Why are you YELLING?
Once again I'm so grateful wirh you, friend!!... I'm taking CompTIA A+ and, I get a completely understanding of things with your videos!... Keep on doing that!.. God bless u!!
So glad I found this channel. Great content tyvm!
Awesome,educating upload as always. 👍
Hi
My one of the most interested education channel is this and learnt more from your videos with best animations, if possible can you cover SD-WAN topic please.
I always watch your videos for a refresher. I noticed my laptop has the UEFI and I didn't knew what it was until now.
Man your videos are awesome. I was just going to ask for a north/south bridge tutorial AND YOU HAVE IT !!!. Amazing!
Good animation & explanation is Too Good
Thanks
Not sure if you explained what CMOS stands for. It stands for “Complementary Metal-Oxide-Semiconductor”.
yea thats correct..
There's no point in me hearing because I'll just forget it. I don't really see the point in remembering what it stands for either.
yes indeed....many people wrongly refer to CMOS as an entity similar to BIOS Setting. CMOS Battery is usually a CR2302 a 3V battery...these batteries are too large for a wrist watch. Having said that this is a good tutorial none the less.
No need to mentioned what is COMS stand for, you will forget it anyway! and even CompTia A+ test will not ask you what is CMOS stand for.
@@FXV *CR2032
This is a clear explanation! Much better than the course I am taking, and paying for...
Extremely illustrative & useful. Don't stop creating such cool stuff.
Dude I really appreciate your videos. Would you be able to make a video on subnet masking?
Keep up the great work sir!
Great explanation! 👍
One correction though. 4:50 large storage recognition is due to GPT instead of MBR partition table. If the disk is has a GPT, it can be used also with BIOS.
I wish to find out such great, detailed explanation like this one, but about the UEFI itself. Its shell, multi-booting (Win+Linux, or Linux+BSD) secure boot, etc.
I'm glad someone pointed this out. It was the first thing I thought when I saw this video. At some point in the future, BIOS will be completely replaced by UEFI.
What does any of this mean?
You Sir, deserve many viewers! Thank you for delivering such a good content! Please keep us informed with new videos! Thank you!
This was good. I liked the accuracy of the animations. Wish you went into deeper details on the actually technical differences between legacy BIOS and UEFI.
Quick Note: UEFI doesn't really require OEMs to use a fancy GUI, some still use the old legacy text based UI of BIOS, using only thd keyboard for navigation.
I've seen boards that had both bios and UEFI... and gave you the option which one to use.
mine is uefi but it has the old ui
In short, the BIOS or UEFI BIOS is a medium between your operating system and hardware,
This is done for 2 reasons security and simplicity.
1) The BIOS/UEFI will prevent psychical damage to your hardware (set limits to what the operating system can and not can do such as voltages cpu, memory, sensors to detect failure and shut off the pc before more harm is done)
2) The operating system has to obey rules set by your BIOS and doesnt need special drivers to control important aspects of your CPU and Motherboard because those are inside the BIOS this makes it secure and easy for OS'es to run on that hardware
can you tell me how an UEFI works ?
nah, bios lets win control mostly everything once you load, for example, boot.ini, hal.dll and alike. so if you, for example, keep pc in stby, bios is never really used, and pc works, right? and consumes few watts while sleeping which is almost the same as bios idling. bios is more of an legacy stuff than a real need.....sure it can halt boot if cpu or ram are faulty but...meh....win can do that too, it bsods it.
Some systems bypass the BIOS routines. BIOS was sort of the KEY for IBM to defeat clonning (didnt last much LOL).
How to configure bios to work with UEFI hard drive
I disagree about your point no 1....modern OS bypass BIOS/UEFI at certain extends settings once it was installed.....BIOS is like the initial firmware or we can called it Operating System at the very basic..hence the name Basic Input Output System....this is where you tell your mobo to enable/disable or any misc settings before we installed OS, e.g storage configurations AHCI,Legacy,Raid. Once your OS and drives up and running, your OS basically already has the control over your hardware, at certain extends. You can from OS level set CPU voltages/frequency/RAM , but stability might not be the best ! Off course at the very low level , OS can't change boot sequence, type of SATA (AHCI or RAID or Legacy) to name a few and some advanced settings that might only viable only at very low level.
*Disclaimer, this my experience dealing with Windows since 1997. I'm not sure how Linux or other OS handles their OS at kernel level.
Great video, I have been reading a chapter in the A+ book and then watching youtube videos, just to get it in my head a bit better. This is the first of your videos I have found so far, but it was well done and just the type of review for after reading I was looking for.😀
You're literally a life saver. Thank you for what you do.
How you do not have millions of views is beyond me.
This guy is a legend
Thanks a lot for your videos! Don't stop to upload videos. Keep up the good work!
This is a wonderfully clear and concise tutorial. Thank you very much. Link of your video saved to my mind map of important stuff👍
UEFI also communicates with the OS while the OS is up and running, and the OS from there could change some UEFI settings. Where bios handed settings to the OS once the OS was loaded but from there remained unchanged.
is this why you can use the ryzen master to OC a ryzen cpu without fiddling bios?
@@necrobynerton7384 if you have the correct program within the OS, you can do many changes to UEFI since they both talk to each other while the OS is up and running.
@@garyr7027 very interesting indeed
I didn't know this, thanks for the reply
It's important to note that not every build comes with a motherboard speaker, or the POST beep option enabled.
yeah, my computer only beeps when there's a problem
before watching this video, i had no idea about this components , thanks to your video now i know what i should learn. thanks alot. and keep going on
Hey, believe it or not I’m reading from a CompTIA book about the BIOS. It’s explanation is so and so (I think because I’m
New) I’ve just watched 15 seconds of your video and completely understand more clearer about the BIOS system. Hopefully you will carry on uploading more awesome computer videos. Thank you Mr.
What software do you use to create these amazing videos?
He uses PowerPoint
@sheepontherun this is very complex for PowerPoint...
I know, he made a video on it ruclips.net/video/oSg-vDKGNDQ/видео.html
I'd love to see a wristwatch that takes a battery as big as the CR2032 that most motherboards use. Not a good example, but a decent video attempt at simplifying a very complex topic.
YOOO MY FAV RUclipsR WAS HERE 10 HOURS AGOO?? DAMN THATS CRAZYYY
He said same type of battery not same size 🤔😊
Some Casios use CR2032 and CR2016
Yes Sir
Windows Blue screen of Death 🤣🤣🤣😂😂😂
I love your clean accent. So much helpful for the people whose first language isn't English. 💙
really I do appreciate your clearly explaining, just keep it up
Yo my dad old PC from 1995 bios had mouse support, with the cursor having an animated tail. The interface had icons too.
You mean.. Windows 95?
@@gigimuschi7466 No the bios had icons like a phone OS home screen, very low color and res obviously. You could click with your animated mouse the options like IDE and other stuff. I remember my older cousin installing that new HP 2x compact disc writer and going in the BIOS and he too being surprised it was like that. That PC has run DOS, windows 3.1, windows 95 and 98. It was upgraded from 16MB memory to 64MB. CPU from 133MHz non MMX Pentium 1 to 200MHz with MMX technology during it's time.
I remember that before I learned to write, I could type cd games, dir *.* And play games like jazz Jack rabit, Wolfenstein. And quite a few others.
In 1995 some bios are manufactured for special or high class motherboard that's why you can see that type of interface 👍....
@@ramanmono maintain your pc properly it's a vintage pc and 😊👍
The long time ago since motherboard 386 the manufactory ami made BIOS with graphic interface and support mouse.
Do you remember ?
Best regards,
winBIOS.
I knew all of this already but I think this video is really good because it nicely explains the difference in a way that is easy to understand even for someone who is not that familiar with how a computer works
No one can compare with you when it comes to explanation of things.The greatest pc channel ever on you tube.
Do modern laptops "beep" after a successful startup? I've had several over the last couple of years and I don't remember hearing the traditional beep I would hear from desktop computers.
Some of the newer ones may not - most manufacturers have been eliminating as many 'options' as possible (try to find a floppy drive or even an optical drive today). The laptop speakers require a driver to make a sound, the original 'beep' came from a direct drive by toggling a single bit on an output port.
I know it's very frustrating. Seems like all those things that we were taught years and years ago about computers seem to be disappearing because manufacturers don't want to spend the money any more due to cost cutting.
Especially if your laptops supports fast boot, you may not really hear anything during normal boot.
@@klwthe3rd your boot beep aren't actually removed, it just disabled by default, so you CAN re enable it from the bios, mine is b450m bazooka plus from msi, and its beep disabled by default, but you can re enable it from the bios
I have optical drive and I like it also one of my optical drive do some weird sound when I turn on the computer like the floppy drive I think it is an beep I use UEFI
oh shit, my PC doesn't beep for few years now and it's still alive :O
Mine also, touch wood
This argument concerned the composers of the previous epoch. That's how they worked. Contemporary ones report only critical errors.
Learned the same thing in a new way! Thank You PowerCert.
Finally after watching uncomfortable video I find the best video to understand this thank u so much ♥️
when i got a new motherboard with uefi bios, i just tried to move with arrow keys lol
Computer may also not beep when the motherboard speaker is discconected.
True
Ohh... come on! It will not beep if you do not plug the power cord either.
True
My msi 450 a pro does not beep, so i need to check it out if there's a speaker connected.
It depends. Some computers have a small beep speaker attached to the motherboard.
Nice simple explanation, no funky soundtrack or intrusive graphics to jazz up the presentation.
Nice work 😊
Short and precise and to the point , excellent !
Actually the CMOS battery is only needed to keep the clock running, the CMOS is solid stage storage.
No the clock is broken .
Maybe on recent 400$ gaming motherboard but clearly not on most motherboard you can find
U can reset the bios settings by removing the CMOS battery for short period of time in older mother boards in case u accidentally faulted the bios settings.
Note: it doesn't work if u have power loss during bios update, then Ur mother board is bricked
@@dreadavis9751 Asus Maximus VIII has a reset switch on the back, no need for removing any battery.
@@dreadavis9751
What if i replaced or charged the bios chip again ?
Will the motherboard work ?
So they finally ditched the old Bios
Im fine with that
Lazarus Blackwell yeah the bios looks bad uefi looks much better
Great video, now the bios and cmos I am totally aware of how to use them and what they were for but since I’m old school I wasn’t really sure how to use UEFI, I’m able to navigate between UEFI and bios but my main board doesn’t have graphical interphase like you described, it’s either or. But thank you so much for your info.. God bless all.
This is by far the best tech explanatory channel ever!
difference between MBR and GPT please
and uefi
MBR is short for Master Boot Record and is sometimes called the Master Partition Table. While GPT is short for GUID or Globally Unique Identifiers Partition Table When you first initialize a storage device such as a hard drive or SSD, you need to give it a partition style which is either an MBR or GPT type. The MBR is just a "record" stored on the first sector of a disk that tells the BIOS/UEFI what partitions are on the disk (hence why it is also called a Master Partition Table) and which partition contains the operating system. When the BIOS is done running POST, it goes to the first disk specified in its boot sequence and when it does, it looks at the MBR to see which partition contains the OS so it run it. A disk with a MBR partition type is limited to only having 4 primary partitions on the disk that an OS can be stored on and can only recognize drives under 2.2 terabytes. The MBR is an older technology and is still used today but is the main and only partition scheme if you are using a traditional BIOS. If the MBR is overwritten or damaged, you most likely will have to fix it or you may end up screwed if you can't. On the other hand, GPT is a feature of UEFI motherboards and addresses the limitations of MBR. First, GPT have globally unique identifiers for each partition which in theory lets you have way more partitions on a disk opposed to an MBR disk; however, Windows will only let you create up to 128 partitions with GPT. Second, GPT allows you to use disks over 2.2 TBs and also stores the Partition Record in multiple places on the disk in case something goes wrong so it can rebuild the Boot Record/Table.
So in Summary, MBR is an older partition style used with BIOS motherboards that has information about the partitions on a disk and which partition contains the operating system so that the BIOS can find it and boot into it. With MBR you can only have 4 primary partitions and disks under 2.2TB. GPT is a newer partition style used with UEFI motherboards that does everything MBR does except it can have up to 128 partitions (Windows), supports disks over 2.2TBs, and stores partition info in multiple sections of the drive for increased data redundancy.
@@james_hake Thank you.
🎯 Key Takeaways for quick navigation:
00:00 🖥️ BIOS initializes hardware during boot, runs POST, and searches for boot device.
00:53 🔊 POST beep codes indicate hardware test results and issues like keyboard or RAM errors.
02:10 ⏲️ CMOS chip stores BIOS settings, needs CMOS battery for power, removing battery resets settings.
03:01 🤝 BIOS is firmware, CMOS stores settings, often integrated with real-time clock.
04:21 🌐 UEFI offers graphical interface, mouse support, and secure boot for modern motherboards.
Made with HARPA AI
Very simple and effective video on BIOS,CMOS,UEFI. thanks for upload. I wish my online study videos were made by you.
I love your videos. I am using them to help me understand and pass the CompTIA A+ exam.
I was today years old when I learned that there are different beep codes.
I like your videos very much but this one lacks many things about UEFI. Saying it has a nice interface does no really address the UEFI differences against BIOS, and the section about booting is too short
Did you watch the whole thing? He said way more than "it has a nice interface."
@@shade0636 for a very common user it says a lot, but maybe you can enlight me. Where are the so called Secure Boot keys stored since neither BIOS nor UEFI can understand a filesystem? Does UEFI interprets the MBR the same way BIOS does? Is the same sector loaded for both UEFI and BIOS? Why it supports larger drives? Does it introduce a new partition table format beyond GPT? Can the same disk be booted either on BIOS or UEFI systems? Tell me where these answers are on the video. At the end, he said "way more" things
@@alvaro_ch How about you tell me where in my comment I said that it contains everything about the difference between UEFI and BIOS? I simply pointed out the fact that he said way more than what you claimed he said.
@@shade0636 yes, the video explains BIOS in detail, and then, at 4:17 explains UEFI in about a minute. That´s way more (nice interface, supports larger drives, can use the mouse and secure boot), so the video "lacks many things about UEFI"
@@alvaro_ch I am not disagreeing with you.
Extremely clear, and helpful.
Thank you.
your explanations are so clear. Thanks!
Uefi is not linux friendly
And is something no one realy needs. Most of Unixes give a sh** on standard disks geometries. They all have their own ones and have no problems with large disks and the (artifical) boot size limitations.
Thank you for your superb content!!! You have to me one of the best teachers here on RUclips.
Finally, somebody explained it easy enough for me to understand
Only now I did know the difference between BIOS and CMOS, awesome, please keep going
what a great series, thanks so much for all the hard work you put in to creating these videos!
Great video, explained elementary level for people like me to understand, informative, and straightforward! Thx I subscribed! Merry Christmas! 😊
I will be checking all of your other videos later to night 👍
Great video! Simple, quick.
Great explanation of these things for someone new to computers. Thnx
English just perfect! Explaining is great!! Just IDEAL!
Explaining complex things in easy way is not. Nice video. Anyone can understand from your content. Thank you very much sir.
This is the best explanation . After this video I subscribed to you. Thanks a lot for all this information, clearly explained 👏
Thank you for the breakdown.
Great tutorial videos, and animations. I'd recommend this channel any day.
If you're taking suggestions I'd suggest that you get rid of the bouncing animation/find an alternation. (It's probably just a me-thing *shrug*)
Glad I looked in on this. I had assumed the boot seq, etc settings were written to an EEPROM BIOS. But I guess a writeable EEPROM in every PC would be too much cost. Simpler to use CMOS to memorise these and keep it going with a button cell.
Thank you for all the free and valuable information friend !!!