Inside a Hard Disc Drive

[@AndrejsZavaruhins]

This is by far the best visualisation of HDD work. We didn't have those fancy visualisations at school when I was learning. We were using our imaginations to get the idea of how thinly it magnetises and reads those 1 and 0. Now someone has put it in visual form. Thanks.

[@TheMadisonHang]

and then, just think of what it takes to make this technology

[@pabodhafernando3791]

1. what is the mechanism that is used to prevent the heads crashing on the disk ? 2. what is the mechanism that is used to move the actuator arm ? 3. each track is divided in to what smaller unit ? 4. what is the name given to each 1 or 0 is called ? 5. what is the main mechanism that is used in the hard disk ?

[@TheMadisonHang]

@@pabodhafernando3791 it only takes one person to understand it for everyone else to use it

[@user-uz4gh7sm9l]

From now on I'll bow down to my laptop each time I use it.

[@kl9686]

Do you still bowing down to your pc until today? Hi.

[@user-uz4gh7sm9l]

@@kl9686 reverence has grown multifolds, now I have offered myself in Its service.

[@Shake_Well_Before_Use]

@@user-uz4gh7sm9l wow

[@HerobrineLolz]

😂🎉

[@AwesomeRobot15]

This is so amazing, everyone should watch this to appreciate the things we use everyday.

[@popyfx2599]

Porta dos Fundos np im using ssd's brah

[@youbox253]

i use ssd .....

[@popyfx2599]

AwesomeRobot15 i dont have a hdd i only use ssd

[@anawsmperson]

Popy TV ssd dies faster than hdd

[@deedr1234]

This is from science channel.

[@eyesweyedopen4599]

This was the grooviest walkthrough of a hard drive I've ever seen. Thank you for changing my life.

[@Megadriver]

Truly an amazing piece of technology that none of us really appreciate enough... You go out and buy a computer and you look at cpu speeds, graphics cards and want more and more ram, but never give the hard drive much thought... Says X terabytes on the brochure and that's it! It's even more amazing how quickly technology is evolving... I remember when I was a kid, our first computer (1997) at home had only a few gigabytes of disk space. Now, 20 years later, the tiny memory card in my phone has over 15 times more space!

[@lastyhopper2792]

And they designed it to be so compact, stable, precise, and also very unlikely to fail

[@vendetta3953]

what a masterpiece of accuracy and engineering

[@Dullfang2]

Amazing video. I had faith that somewhere on KZbin there would be a video taking us inside the hard drive to explain everything. Thank you. I understand now

[@msgcheckout]

truly amazing technology, guess what gave it birth, yes the good old fashioned vinyals and audio magnetic recording, as well as floppy disc drives.

[@jaywalker7084]

Thumbs up, but obviously subject to interpretation, I'd say the punch-card was the start. And, as a fun fact, was used by Hollerith (DuckGoGo "The Hollerith Machine") who's company was later renamed IBM :)

[@msgcheckout]

To compare how tiny the bits are, you could fit a 10Mega pixel picture on a size equal to a sperm head, now for those who don't know how big that is, there are 10 million such heads in a drop. Now you can imagine how small is a bit. (Please don't take it too seriously some people have thick sperm heads and you would only get one sperm head per testicle :-)

[@burg3r]

samdomding and now the created the special ssd as known as solid state drive, Jesus what's next floating computers?!

[@rjbarns]

Great video, thanks! I looked at most of the other videos on how HDD works here on YT and this is by far the best one.

[@chronicsynergy]

"at speeds that defy comprehension" imagine when this guy saw an ssd for the first time

[@mammamia2418]

XD

[@notsoseagatey]

Bro this video is old - sure SSD existed but isn't common.

[@gavingalston8644]

Okay, so it said that 1 square centimeter on a hard drive holds 31 billion bits... So a hard drive with a 3.5 inch diameter x pi = about 11, x 2.5 (inches to centimeters) = a 27.5cm hard disk. (Squared) 27.5 x 31 billion bits = 852500000000 bits, or a 100 gigabyte hard drive exactly. with hard disks in the terabytes now, a 2TB harddrive would be able to hold 620 billion bits (72 gigabytes) per centimeter instead of the 31 billion (3.7 gigabytes) when this video was made. But nobody probably cares.

[@Daniel-cz9gt]

*1.75^2 x 3.1416=9.62 x 6.25 (SQUARE inches to square centimeters)=60cm^2 60 x 31,000,000,000=1860000000000 bit=232 gb.

[@josephkreifelsii6596]

I've taken apart over 50 HDDs in my life. I'm seeing that the older larger HDDs had 2 disks, while the newer larger ones use 1 disk. They've managed to fit 2 disks of information into just 1 disk.

[@joemama069]

Logan Strong i didnt understand anything but okay

[@phantomnebgaming]

as part of your observations were true, some can't be translated into real world hdd manufacturing. not all of the surface area of the disk is writable/readable. factors like extreme diameters such as the inner and outer diameters have so many noises that the actuators can have problems reaching its position and affects performance. also there are spaces in between tracks and sectors that are left blank during recording to avoid interferences during magnetic recording. you computed the whole disk and forgot that a large piece of the surface is also underneath the center cap that connects to the brushless motor.

[@midinerd]

620 billion tiny violins just started playing at 60hz btw

[@mohdipgajera5112]

When you realise that your movie is nothing but only 1 and 0 😂😂😂😂😂😂

[@Ablequerq]

😂😂😂😂👌👌👌👌

[@shazan18]

esoft guys 🙋‍♂

[@Thariya73]

😂❤

[@artfulharmonies]

Yeah 😂

[@AmaliPriyadarshani-p4n]

Yes

[@liontech8013]

Yes 😂

[@DinushiPrabodya-lq2sz]

😂💗

[@juliencrn]

WOW WHO INVENTED THIS? much complicated than it looks i feel dumb now

[@cobrasvt347]

this is the best example of hdd operation i have seen yet, professionally speaking its very acurate

[@ComandanteJ]

Does anyone else find this really inspiring? Shows off how magnifecent we are, and makes me want a time machine to see what we will have 100 year in the future.

[@taniyadiwyanjali306]

1. What is the part of the name, that holds the Read write head? 2. What is the mechanism that use to prevents the head crashing on the disk? 3. What is the mechanism that used to move the actuator arm? 4. Each Track Divided in to? 5. Each 1 or 0 is Called a type of? 6. What is the main mechanism that use in the hard disk? can you answer the questions I ask ?

[@Ahamed-gk1hh]

can you help me in this to answer

[@kona702]

@ 1:06 ....YES THERE IS FRICTION. Things that arent in direct contact doesnt mean they dont cause friction on eachother. The movement of the air at 80mph is an example of this friction. If there was no friction, the drive wouldnt work...period...beleive it or not the HDD REQUIRES friction to operate correctly and within specs...

[@darinb.3273]

Consider this if it wasn't for the AIR FRICTION... the heads couldn't float ... so compared to ACTUAL CONTACT... yes it is for all intent and purposes a frictionless environment ... can't forget the spinning disks either they cause the air to move inside the drive as well (thus the cushion of air between the heads and platters)

[@giancarloprado8206]

SSD has join the chat. HDD: I'm a joke to you?

[@kotai2003]

the best presentation for understanding HDD.

[@ramiBudemaris]

why i feel i want to cry after watching this , that is impressive.

[@rajibroychowdhury4202]

Its awesome........Hats off to them those who made this......

[@tubebility]

A slick presentation of the balancing act it takes to maintain such systems that we take for granted. I was reading about the problem (of capacity) with commercialising the Laser HDD vs Magnetic HDD. The problem was, the laser uses 5 microns, while magnetic uses less than one. So, I looked up micron vs centimetre, and laughed my head off just thinking about such microscopic scales. Here is another presentation about microscopic scales (in time): watch?v=mfgsQX78hg8

[@OnyxCrow87]

This is a cool video documenting classic hardware.

[@GlobeRoad]

The data on the outer edge of the disk is read and/or written faster than the inner edge of the disk since the outer edge rotates faster than the inner edge.

[@kona702]

Wow the 747 analogy made me chuckle...what an EXTREME example of scale comparison. You have to be realistic and to scale for these types of comparisons...

[@luckycat5107]

because the read write head only floats nanometers above the disk and because the read write head is smaller than a piece of Hare and because of the speed the read write head is heavier than it looks also because of the positive and negative which represents on and off or one and zero which the computer can understand

[@truth-12345.]

Man, the complex engineering they have to design in order to make this device in reality, and now it's slowly becoming obsolete.

[@parveshkhatri1027]

This is called seriously hard worked video . Salute

[@DaveBabler]

This is great but it really needs to be updated for proper HD viewing.

[@papalouie5517]

Dude this was 11 years ago

[@Devcasteel]

That pun at the en made me groan. But it was amazing!

[@DonaldMurf]

I went and found this because in 2021 my DF teacher was using folded paper towel and a dry erase marker to try and explain how mechanical hard drives work. Man, what value I get for all the tuition I pay...

[@slagboy9812]

Isuru sir nisa balanna awe sago 🇱🇰 😌❤️✨️

[@zaker6257]

Still, an awesome and awing piece of technology!

[@KiwiPowerNZ]

even 60 years in the future there will only be boring SSDs with no moving parts :( and you'll be saying, back in my day your files were stored on magnetic disks!

[@BharathKumar-ip7gg]

Really great invention

[@RayMysteryo]

my brain just frickin exploded .. feels good feels good.. its been a long time

[@micmwaura]

very nice explanation...nice commentary

[@Laughing_Cat_Meme]

11 years after this comment 🤗

[@ziadfreshgame8553]

مرحبا انت ٥اكر التعليق دة

[@andresbudihardja]

if HDD head problem can solved ? i have drive can detect but not spin & incorrect function message after choose initialize disk use MBR in disk management

[@rencrawx9491]

I had this urge to disassemble my hard disk upon watching this video

[@_tanzil_]

*I wonder who is that genius made the hard disk 💿 first time* Salute to him..😎

[@natashavaughan8688]

That arm control is what controls online roulette

[@cursory9031]

props to my lecturer for sending us this video

[@andic6676]

Amazing presentation

[@nagualdesign]

I remember a diagram from my computing class at college which showed the space between the head and the disk compared to a single particle of smoke. It looked like a football next to a letterbox!

[@mike7958]

WTF is he talking about when he compares the head clearance to a 747?

[@RClass719]

The read head never touches the disk, it floats above the disk with only a few nanometers clearance, so the narrator is using it as an analogy that when the disk faulters and the head hits the platter, the damage done to the disk is similar to that of a 747 crashing.

[@mariusfacktor3597]

Michael Hancock That's a stretch

[@seekter-kafa]

not really, he compares sizes, it is like 747 is flying at 60miles per hour only half an inch (or so, i dont remember) from the ground!

[@methane13]

@@seekter-kafa yeah 1/100th of inch above ground

[@prostocheck]

fucking jump scare in the end of an unholy vacuum cleaner.

[@devonds3388]

Thank you from esoft ja ela😌

[@DulenDesilva-x7z]

👍

[@incubusholic]

@voidofdeath dude, that video said, "One high quality photo can take up 29 million bits" the right math is 29000000/1024/1024 = 27.65 KB 1 KiloByte = 1024 Byte 1 Byte = 1024 Bit

[@demogaming8895]

"speed that defies comprehension" and yet, now it's one of the slower storage types

[@Bandicoot803]

A cigarette smoke particle does NOT fit in the space between read/write heads and platter, it would easily jack up the head.

[@haroldplaysminecraftharold8274]

So basically, hard drives are like old jukeboxes from the '90's(or '80's) but with a circuit board that keeps the 'disk' rotating every minute without stopping (except without electricity), btw i have a question, does overclocking a hard drive speeds up its spinning speed? just asking..

[@pabodhafernando3791]

1. what is the mechanism that is used to prevent the heads crashing on the disk ? 2. what is the mechanism that is used to move the actuator arm ? 3. each track is divided in to what smaller unit ? 4. what is the name given to each 1 or 0 is called ? 5. what is the main mechanism that is used in the hard disk ?

[@thidastheekshana7358]

Anzwers

[@chanidunimsara905]

😂

[@Emi_Ama]

Esoft campus tutorial questions 😁

[@قناهالاسطوره-م1ه]

I have a disk that makes a clicking sound and is not recognized by the computer. What is the solution?

[@javadkazemi9913]

hello I have a scartched hard disk platter problem. my hard disk is wd 4 tb.could you please recommend to me a service place to repair the hard disk? Tanks

[@connorwiebe611]

i still dont understand how 1s and 0s actually take up physical space

[@connorwiebe611]

why cant an infinite number of 1s and 0s fit into one "magnetic cell"?

[@connorwiebe611]

why do they store the 1s and 0s in magnetic cells? Why can they only hold one 1 or 0?

[@HighAway]

n00b_asaurous excellent answer. it made so much sense if you look at how you write code in C++

[@mariusfacktor3597]

Connor Wiebe They are interpreted into 1s and 0s at a different hardware component. At the disk hard drive the only thing that is imposed or read is the positive or negative (or north or south) charges of magnets. The atoms of the disk orient their positive side towards the head component when the head has a negative charge. The atoms stay in this orientation so that they can be interpreted as positive facing or negative facing until they are rewritten. The positive or negative (also called north or south) is what becomes the 1s and 0s later. You can't get more than two outcomes with magnets. It's either positive or negative so computers decide 1 or 0.

[@khushalashani]

Bravo for the explanation!, I study Computer Science and found this enjoyable to read.

[@GamezGames19]

Hard drives are amazing pieces of engineering compared to those damn floppy-hoppy SSDs!

[@gluestickguymusic9012]

Lucas Kroon lol

[@xJaAviiEeR]

"....BIT... BY BIT..." worth the watch till the end

[@Smartzenegger]

Question: Does the heads get more lift at the edge of the disk compared to the most inner track of the disc or not?

[@PinoyPogiman]

So thats why i feel my 5th gen Ipod classic vibrating

[@xmdude626]

The question I have is, how do all these tiny magnetized particles stay perfectly lined up don't jump or move around since we know that like poles repel and opossite poles attract.

[@christianaranda9426]

There's a layer on what they called heads or what we called slider. Maybe can see it with a 400x magnification.

[@ocheinoderrick5620]

I have a habit of cooling down my external hard disks using a cold wet towel. It really works well. Temperature can drop from 52'c to 42'c in just 3 minutes. Is this method safe for the hard disk?

[@peterkago7228]

I once disassembled a hard disk and still have the disc and circuit board

[@Daniel_Page]

and this is just the beginning

[@krazyhartin]

Compares the spindle head to an airplane flying 0.001" from the ground, with enthusiasm. Gives minimal info on how the head WRITES data onto the PLATTER.

[@msgsgt]

if i didn't know better i would think that steven job and gates were aliens

[@Awcator]

What an engineering marvel

[@MyBuxJT]

how are the bits made when its too small for us to even see or do anything to make it

[@MUSICWORLD-rg4uk]

What is the mechanism that use to prevents the head crashing on the disk?

[@hotswap_tofu5087]

So that is why hdd sounds like a jet. With 100,000 passengers

[@OscarLodge]

Very good... Iv'e always wondered how the HDD works... some staggering facts there too.. brain baffling .. Cheers. !

[@ChappyBT]

You're confusing Analog storage on magnetic tape (cassette, reel-to-reel) with HDD magnetic storage. HDD's are magnetic storage devices of binary information. The only thing you are correct about is that the info is not stored as 1's and 0's, they are stored as positive and negative, which is read as either a 1 or a 0. Analog storage was similar to a waveform in that a stronger analog signal was reflected by a stronger magnetization of the tape, making the magnetic field appear as a waveform.

[@voidofdeath]

@incubusholic Wrong. It's actually 3.457 MB.

[@serialglobetrotter]

difference between constant angular velocity and multiple zone recording???

[@deiu9999]

wow. I`m so amazed! also, great video... it`s explaining so well.

[@sayori3939]

Every hd's a gangster untill the number 2 appears ...

[@sayori3939]

But seriously this video was incredible!

[@starstudio8402]

2?Wait what-|insert blu screen here|

[@sayori3939]

@@starstudio8402 this may sound a bit ironic but can you explain my own joke because it don't remember it after 2 months 😄

[@sayori3939]

@@starstudio8402 oh I remember now! 😅

[@arcanum-a]

Wow this was amazing

[@faltolegends5768]

Its really amazing and informative one

[@tristantrezise5102]

this is pretty nifty

[@mixeddreams8731]

It's fascinating.

[@HHJHJFDSSDFF]

Honestly, it may sound super revolutionary, but HDD are quite impractical/bulky/fragile devices.. They are too complicated for the task at hand. At the rate computer tech has been evolving today im surprised solid state drives haven't been the industry standard for quite some time now. When i think of the amazing tech used in all other components, than think about the HDD.. something about a physical spinning motor/disk just seems so ancient to me. SSD needs to get up there!!

[@batvenio3533]

It is really unbelievable :)

[@PudgyOrange]

great video!

[@dannyh8750]

its fun because it is going so fast i mean an collega of mine showed me his old hdd it was a whopping 700MB and now i have laying around a 4TB disk and you can get a 10TB disk today

I need this vid in higher quality. Can Discovery channel digitize and upscale it to at least 1920x1020? I know even a photo upscaling is hard to do without quality loss, not to mention video quality upscaling. But this video nails it by summarizing the HDD and explaining how the needle magnetizes the disk. I can show needle on the projector screen, explain by saying and waving my hands, but I'd rather demonstrate this instead. As I understand, this vid might be gone one day since it belongs to Discovery Science, while the channel author is ...

[@programming9104]

i am 22 years old and i love this topic :D

[@1sonyzz]

+programming 24 years old and love it too

[@リンゴ酢-b8g]

Hard drives typically have several platters which are mounted on the same spindle. A platter can store information on both sides, requiring two heads per platter. en.wikipedia.org/wiki/Hard_disk_drive_platter

[@axelkakasho]

Ant to think that nowadays this thing is considered slow.

[@shupesmerga4694]

when you thought that programmers are awesome then you thought of the people who invented this.

[@anuradhapillai7952]

Exactly

[@johnyvico]

All from alien technology The rosewell crash

[@TheAbderaman]

despite the HDD is amond the most complex tecknology of engineering it is not a valuable for long therm storage for archives , because it demagnetises by the time high quality CD's can live up to 30 years protected from humidity

[@abundantharmony]

How did you post this without a strike?

[@xmdude626]

So the head magnetizes tiny particles to 2 different state, N to S or S to N. How do all these magnetized particles don't interfere with one another since there's billions of them.

[@stoatwblr]

+xmdude626 "spacing" or "density" - hard drives are now at the point where it's difficult to pack the magnetic domains any closer, which is why we now have "shingled" (SMR) drives (which overlaps tracks. Great for archive work but lousy for anything else) and "heat assisted magnetorestrictive"(HAMR) tech - which mounts a laser on the read/write head to zap each spot to a higher temperature for writing. Both technologies are problematic and by the time they're perfected there's a good chance Solid State Drives will have overtaken them in both size and price.

[@luckycat5107]

+stoatwblr fat or file allocation table

[@gato031]

Electricity and magnetism are the same type of force

[@gato031]

Moving charges produce magnetic fields. Magnets are materials with a natural magnetization due to those moving charges generally speaking. The expression of the electromagnetic force differenciates the magnetic and electric term as a result of historical tradition. The general property of matter that produces the force is the charge , in both cases

[@atillaattila8900]

Thanks for good information

[@pakan357]

Ah, that sexy HD4870...

[@limitless1692]

is is the best video aboud hdd by far

[@anns666]

nowadays everybody uses ssd's but hdd was a cool thing, i miss the noise

[@Furqan156]

from Esoft anyone else?

[@methumranawaka7436]

yo

[@madanikhan1346]

Sony ps5 ssd: hold my beer 🍺

[@Sva010]

ryzen: intel hold my screwdriver

[@madanikhan1346]

🤣

[@AngusMcDonald]

great video