I love how this man explains with appreciation. This is true knowledge.

And one last thing: don't open up your hard-drive like that unless you want to lose all your porn.

@arbitrage2141

6 жыл бұрын

Evan Ohashi-White I thought it was funny

@CombineWatermelon

3 жыл бұрын

no not my 30gb of robot hentai!

It just blows my mind how complicated this stuff is. I can barely even comprehend what's going on, and at some point someone actually sat down and built this stuff. It's beautiful.

Cute little factoid: while the head movement isn't temperature sensitive, the platters are. The cylinders (tracks) are so very tiny in width that the drive actually has to compensate for its internal temperature when moving the heads from track to track. A specific style of failure among a certain brand of drive which I'll not name was for the temperature compensation to go bad, and the drive would work fine for as much as 60 seconds or so and then go into seek seek seek mode because it couldn't find the right tracks. I've recovered data off more than one drive by bagging it up, sealing the entry well, putting it in the freezer, and running it in there, giving me 3-4 minutes to grab data before the drive would fail and needed to cool down.

@williams6550

7 жыл бұрын

....it couldn't find the WHAT!!?? beep boop error error

@copperhamster

7 жыл бұрын

there was a show more: right tracks. I've recovered data off more than one drive by bagging it up, sealing the entry well, putting it in the freezer, and running it in there, giving me 3-4 minutes to grab data before the drive would fail and needed to cool down.

@williams6550

7 жыл бұрын

Copper Hamster That's odd. I did click show more, and that's as far as it got. KZread dropped the ball and made me look like a fool! Cheers to you, Mr. Hamster.

@mariusa5754

7 жыл бұрын

+Copper Hamster Yeah I've seen a KZread video of someone trying to recover data from a HDD, one of the things they tried was putting it in a freezer, it didn't work on their hard drive though. What brand was it?

@copperhamster

7 жыл бұрын

Marius Ammann Western Digital drives were particularly bad about this failure mode back... oh around 2000-2005 era. So probably that's when and what brand it was.

Bill Hammack for President

@rogertycholiz2218

6 жыл бұрын

Bill is the best - he knows everything!

@Nhatanh0475

4 жыл бұрын

He should be CEO rather then President.

Please! If you are inspired by this video, don't try to open your hard drive. It is 70% of probability that you will damage your hard drive.

@anonymoususer3561

8 жыл бұрын

+Srimati Soren *99%

@williams6550

7 жыл бұрын

70% of the time, you'll damage it every time.

@NameTheUnnamed12

4 жыл бұрын

Hah you are fool. I unplugged it and poured vodka on it to clean it.

@torpedo996

4 жыл бұрын

@@NameTheUnnamed12 Slav 100.

@VoidFame

4 жыл бұрын

I already opened my harddrive a couple years ago and this video makes me want to try and get it running again.

I have seen over 100 videos about hard disk ...yet this is the best informative video I have ever seen. It is fun to watch and learn.

I'm still mind boggled how an HDD with a head floating nanometers above a rotating surface can survive even the slightest bump or even the normal vibrations of the PC itself.

@Theunihornable

4 жыл бұрын

Depends on the hard drive itself, the ones used in laptops are far more durable than that of the ones used in desktops because laptops go through more bumps than a desktop. If you were to drop a desktop hard drive while it is spinning, it would be damaged.

Hard drives are a marvel of engineering, perhaps more so than SSD. It's just a shame the advantages of SSD's now make me scoff at the performance and fragility of Hard Drives

@joeevans84

8 жыл бұрын

***** I reckon it's because once an SSD has an error, that's it for the chip, but if a HD breaks, you can still recover the data off the platters.

@ProfessorEGadd

8 жыл бұрын

+drthsons Dot Scoff all you like but SSD won't be replacing HDDs in their main application, large scale data centres, for some time. SSD damage themselves too much when rewriting data to be useful in such a demanding application, where billions of read/write cycles are needed and data has to be stable over decades. The relatively small and unchallenging personal computer market is small-fry by comparison.

@Penguin-kr9do

7 жыл бұрын

I don't think most people care what they use in large-scale operations. Hell, the Government still uses magnetic tapes for some data storage applications. SSDs are rapidly replacing HDDs in home computers, and that's what people care about the most.

@happmacdonald

7 жыл бұрын

+ProfessorEGadd "Scoff all you like but SSD won't be replacing HDDs in their main application, large scale data centres, for some time." They long since have, friend. SSDs offer magnitudes greater throughput and seek speeds, which are the bread and butter of any high throughput datacenter.. and since we store data redundantly across our storage media to begin with, we just hot swap failed components on whatever schedule we choose. Hell, before SSDs came out we would just RAID together up to a hundred lowest-possible-capacity, highest possible RPM platter drives per SAN, and even then be careful to only use their outermost edges to wring maximal seek speed and IOPS out of them. Now turn that damned music down off my lawn.

@JohannSwart_JWS

7 жыл бұрын

OK, now build a petabyte storage facility from SSD's only. Firstly, they don't RAID normally like we expect from HDD's. Secondly, their unpredicted failure rates are much higher. Then, there's the budget... Maybe OK for your SAN. Not so much for proper large scale storage.

Been in IT all my life, HDDs and Cdroms still blow my mind. :D

Engineerguy just proves to me how amazing humans are. It just blows my mind that someone invented this, people discovered that this method of data works, and fine tuned it.

@sheilaolfieway1885

3 жыл бұрын

it's really just an advanced tape. a tape used the same concept, magnets.

@Dennis19901

3 жыл бұрын

@@sheilaolfieway1885 Your easy dismissal of such a concept tells of your ignorance on the topic.

@sheilaolfieway1885

3 жыл бұрын

@@Dennis19901 Your assumption proves you are a fool.

I've had two hard drives that went haywire and opened em both outta curiosity but never managed to get a clean grasp of how it worked. You just cleared that up. Never thought fluid dynamics was used in a hard disc. Thanks a lot for your content. I really appreciate it. Please keep em coming! :)

Your best video Bill, nicely done

That clicking at the beginning made me realy nervous

@sillysad3198

8 жыл бұрын

+1metiz it explains why modern days HDD do not require the "parking" operation, everybody has already forgotten what an improvement it was: autoparking HDDs...

@fredfindl

8 жыл бұрын

Drives with stepper motor actuators haven't made in years, many of those did require some type of "parking" routine to retract the heads from the media. Since voice coil actuators retract the heads when the drive is powered down, none of that is necessary anymore....

It just blows my mind how any human being can consider this not interesting. It's so amazing it moves me, like art.

You are doing a great service to humanity, Mr. Hammek. Thank you for your videos.

For everyone outside Liberia, United states and Myanmar... three hundredths of an inch is 0.762mm.

Damn, so simple and extremely impressive at the same time. I got a 1TB one on my PS4 and a 250GB one on my Xbox 360.

I had my doubts that you could cover this whole topin in 5 minutes but you proved me wrong. Well done, as always

I was looking for a video to demonstrate the ludicrously tiny physical tolerances in spinning storage, and while I needed to quote Scott Mueller for the majority of the scale-ups, that smoothness analogy was brilliant. Thanks!

when nasa went to the moon they used paper with holes in them as storage. and look at us now. wow!

@sillysad3198

8 жыл бұрын

+Granbanan > and look at us now. wow! we are incapable of doing a tiny fraction of that that was done with punch-cards.

@jogrobler

8 жыл бұрын

+Silly Sad Big difference between being incapable and just not having the same priorities. With the private sector getting into space travel (especially SpaceX) there's a very real chance that space travel will finally go where we all hoped it would decades ago.

@dannyleung2796

7 жыл бұрын

Punch cards and paper tapes are for data and program input only. Data was stored on magnetic tapes.

@40Sec

6 жыл бұрын

Silly Sad - Haven't seen those pictures of Pluto, have you?

@BaxterRoss

6 жыл бұрын

Nah dog - core rope memory ;)

would be awesome if there was an ssd video

This is why Illinois has the best education level in the country. We NEED more professors like him all over the world!

How had I not heard of this channel before? Woah! Subbed without a second thought, wonderful, Bill, the best explanation of Winchester drives I have EVER heard on KZread, and so concise and short. God bless you, thank you, from England :)

+engineerguy So if it picks the most probable option, how come the data is stored reliably? How come the "most probable" is never wrong? Judging by the way you've described it, two distinct series of bits could produce the same magnetic sequence, so how would the hard drive tell them apart?

@SianaGearz

7 жыл бұрын

There is always a checksum somewhere, for example Reed-Solomon code that allows to restore data where some bits are wrong. Hard drives are not strictly reliable - they are expected to return incorrect data to host once every 50-100 years on average in normal operation, but as you may have noticed, they tend to wear out long before that, for example due to dust ingress, mechanical wear, coil burnout, or power transistor wear (due to thermal degradation, ion motility).

I took a break from studying remanence, coercivity... etc in physics and clicked on a video which contains that. XD

Finally, an educational program that shows the math. No math=Casual conversation, Math=science!

Simply amazing! I am a physics postgraduate. I know the physics, but to see the use of this in hard drive is wonderful

Jimmy Fallon should put a "Thank you, Engineers" bit for this instead of dumb thank yous to Caitlyn Jenner or whatever.

@workhardism

7 жыл бұрын

Correct. Agreed.

@fartsnstuf

5 жыл бұрын

no thanks, I wouldn't want an unfunny jackass thanking people for actually doing stuff

@spaceghost8995

5 жыл бұрын

Why are you talking about Fallon ?

P-put a magnet in it

@johnathankrausrig9237

7 жыл бұрын

the harddrive is broken after you applied force on the screws while opening it

@Theunihornable

4 жыл бұрын

That's why floppy disks would get damaged when you hold a magnet near them. The floppy disk would operate similar to that of a hard disk

I didn't think I would glean so much info in 5 mins. Thank you.

This video is brilliant, it has taught me something that I've been wanting to know for years, I tried asking my physics teacher and his answer was hopless, this video couldnt have been more informative! Thank you engineer guy!

More importantly, WHY AM I NOT SUBBED TO YOU???

@DashRantic

5 жыл бұрын

did you ever figure that out?

Ooh a Pentium 4!

How could you possibly dislike something remarkable like this..

you make such complex machinery much easier to understand, thank you!

So how about solid state? How do they work?

@mcjay669

7 жыл бұрын

nickrulercreator it's just flash memory, there's no moving parts

@PianoScenesMoviesandSeries

7 жыл бұрын

@OldSoulPortal I laughed and spilled my coffee.

@Kidsvids82

7 жыл бұрын

OldSoulPortal made my day bruh hahaha

@SianaGearz

7 жыл бұрын

Actually there's always something that does something, else nothing would happen. There are capacitors that store information as charge, and there are FETs (field effect transistors) and when you apply a voltage to the gate of the FET, the conductance between source and drain changes. In fact you can just use the parasitic capacitance of the gate to store information, you energize it, and the voltage on the gate can hang around for a very long time! I think this is how flash works.

@justpassnthru

3 жыл бұрын

*I* 's and *O* 's

so basically a hard drive is like a record player but the record is made of metal and the needle is made of magnets.

@Matticitt

7 жыл бұрын

Not really. And it depends whether you're talking about CDs or Vinyl.

Another great video Bill. Shows how much scientific research and work has gone into making such precise devices that millions use in their daily lives. The wonder of science never ceases to amaze!

This is an incredible video for an incredible piece of technology. More please!

"A home computer must store data reliably to work well or else it's pointless. Enter the Chromebook.

@ahall9839

5 жыл бұрын

Which still needs to store data reliably to work well. It doesn't just magically teleport the internet onto the screen.

Now do a video about how SSD work

@9000888sora

4 жыл бұрын

I dont think he has the expertise to explain it. Theres not an easily explainable answer for them as they have many more variables. Modern SSDs use nandflash and microcontrollers. But point is they're a lot more complex.

Thanks for the videos, Bill. Interesting and nicely produced. Good work!

I gotta hand it to you. I LOVE this type of content and you present it in a great way! Keep them coming!! I love to see how things work.

but... how can you change a single bit in a sequence? let's say i have: > > , which is: 0 1 0 1 if i would like to change it to 1 1 0 1 i would have to rewrite everything after the first zero, not only it: > > 1 1 0 1 how is this done? is every byte separate, so i can rewrite only it, without affecting anything else? Anybody knows?

@powder-phun949

9 жыл бұрын

but if my change would in the middle of that sector, I would have to change almost 2000 bits?

@powder-phun949

9 жыл бұрын

***** So basically you just don't change a single bit? That makes sense. it's easier to just move the changed data to a new sector. Right?

@powder-phun949

9 жыл бұрын

Got it.

So basically my porn collection is just 1's and 0's.

@lolioliol360

8 жыл бұрын

+Saral451 and any profile youve made or videos youve watched or friends pictures youve seen or messages youve sent.

@thedocumentarian7259

8 жыл бұрын

+Saral451 Hot or not.

@kingdavewoody

8 жыл бұрын

+Saral451 1's are dicks and 0's are the things that dicks go in

@LaplacianFourier

7 жыл бұрын

How is that different from penises and holes?

@williams6550

7 жыл бұрын

1+0=good; 0+0=good; 1+1=not so much.

Awesome video. I always love to see a new one posted. Thanks.

It completely blows my mind how people have discovered how to create such complex machines as well as things like space exploration as well as many many more scientific and engineering inventions and discoveries.

Dat red shirt, tho.

somebody is copying your video 4iaxOUYalJU

@MadSparks164

7 жыл бұрын

He has released this video under the creative commons licence - Meaning reuse is allowed, as long as credit to the original author is given. The channel in question has stated the 'source video' as belonging to engineerguy, and has made no attempts to cut his outro - Legally and ethically, this is fair play.

These engineers dont get enough credit. This is absolutely amazing technology. God bless those brilliant engineer minds.👏👏👏👍

Those voice coil magnets are crazy-strong (the better to move the head quickly, I guess.) I have a number of old hard drives that had confidential customer information on them, so I took the platters out and use them as coasters, and I took out the voice coil magnets to use as fridge magnets, before sending the rest for recycling. The magnets can hold 50+ pages to the fridge at once. Great video!

Metric dude. Dont you engineers use metric?

@Xanifur

9 жыл бұрын

nm is metric, he just used the football field as an example for us 'murricans.

@opfinderHarald

9 жыл бұрын

Well as he sad, "american or european football field" and wrote how many yards an european and an american football field is, he uses imperial measures. And when he describes how smooth it is, he says that enlarged to a football field there would be less than 1/300 of an inch (imperial again) difference in the elevation of the field. And of course nm is a metric unit, but he is probably using nm because it sounds stupid to say "the head floats around 0.00000009843 inch over the metal disk"

@you238

9 жыл бұрын

Engineers are pragmatists and use whatever unit is appropriate or they grew up with. Usually they can get away with it because they're talking to fellow engineers that are intelligent enough to understand whatever unit they choose to use.

@uberLejoe

9 жыл бұрын

He's an American, he was raised imperial... It's how we speak, it's in our euphemisms, deal with it...

@ib9rt

9 жыл бұрын

Harald Togram Units of measure are like languages. Just as it's good to speak different languages (English, Spanish, German, French...) it's also good to be fluent in different units of measure (joules, calories, BTUs, ...). Engineers are able converse in different technical "languages" and translate between them.

Your videos are always very articulate and informative.

Love ya, Bill. Keep up the great work. This video was well-presented, interesting, and VERY informative. Thanks!

Have you considered making this into a television show? I would watch every episode! :) Your ability to cover very fascinating subjects and break them down so anyone can understand them impresses me. Keep up the great work! I look forward to your next video.

Now consider that all of this amazing innovation has had 9 WHOLE YEARS to progress even further since this video was uploaded.

I'm an engineering student and I love all your vids!

I must say, I enjoy these videos a lot and learn more about computers than i ever would in a class. Thanks.

Thanks, this always fascinated me how many trillions of bits of information may be condensed like this!

Absolutely incredible! Your explanation is clear but trying to imagine proposing this original idea and not being laughed off the planet is difficult. How they made the thing work has got to be a story in itself!

God.....he should be having 50 million subscribers right now....for his work and knowledge

EXPLAIN EVERYTHING IN MY HOUSE TO ME! Your content is so intriguing, and even though the material in itself is not super entertaining, the polished look makes me enjoy learning about it. Love it.

Its amazing to see how the hardrive of the computer is and how it works because most of people doesn´t pay attention to this, but without the hardrive the computer couldn´t work well. It is difficult to understand all this stuff but this video helped a lot. Its incredible how a very small box can make a computer work well. It was amazing to know how this worked.

This was very useful, I didn't realize just how closely linked physics and computer science was. Thanks for helping me understand.

@subzeroicefrost

8 жыл бұрын

+The Three Musketeers Computer Engineering *

This is an amazing video. Really helped understanding how everything works

Love your movies - short and still quite accurate and detailed. Keep it up!

the world needs more people like this guy

Brilliant, love your work.

Back in 1984 I worked for Ampex Corporation in their hard drive division. We were given the basic discs (substrate) and ground the surface with a diamond tip to a mirror surface. I remember the surfaces had to be absolutely perfect, and if you accidentally got a bit of saliva on it blowing off any dust you'd have to regrind it. The measurements for thickness of the disc was crucial as well.

@engineerguyvideo : Correct, the key is 'WITH SERVO CONTROL'. It is the servo control that performs the temperature compensation. The VCM itself IS temperature dependent. We ( My collegues and I design the chips that control the VCM and motor ) measure the headstack temperature , combine that 'rough' information with the seek offset error (see how far we are from the actual track by finding the track information) and pre-compensate the movement. This is a continuous process.

ones again, thank you for posting great informative videos

This is a really great video, thank you Bill!

Great explanation. Thank you!

Thank you for a new episode. Been waiting

Great video, I remember the first time I saw a hard drive apart, well.. it was my brand new 1gb hard drive, we had a power surge and it fried my computer and everything in it.. so I took the hard drive apart, still clueless until today HOW it worked, I was amazed at the insides.. for about 10 min until I got my 20 lb sledge hammer.. I was still picking up pieces of it 3 years later and each time I thought I had everything.. thanks again Bill..

The exact kind of explanation I was looking for. Great!!!

i had no idea that so much engineering went into such a simple tool...wow! +1 sir

Ah, really awesome video! This video was very well made and your voice was perfect for this. Being a programmer and a "techie", I've always wanted to know the exact workings of a hard drive. The hard disk drive may very well be the most amazing thing humans have ever created, maybe followed closely with the CPU.

Great video. Fascinating stuff.

Impressive video. I remember one of my lecture where we were told the precision needed to write a bit is comparable to landing a plane on a stamp!

you sir are the best tech explaining guy on youtube. we want more :D

You did such an amazing job that your character made me believe you were a real engineer; with that said, you made boring science interesting again, so props to you, and I subscribed. Thanks.

the sound of it spinning is so nostalgic

Bill, wonderful videos! best series on youtube!

Oh man, I didn't know this was one of Bill's videos until I heard the intro music. Great theming!

Nicely done! Complex information put simply.Gives me the illusion of feeling smart, and the knowledge I am a little less ignorant

Wow you are amazing at explaining complicated things. Bravo sir!

Excellent videos as ususal. Fascinating!

This is beautiful.

So much complexity behind this 'little box' in our computer. Very well explained. Informative. Thanks. I sub.

Great video! Incredibly interesting and intriguing stuff for the layperson to watch!

Amazing! I like the way he explains it. Is good to know how the hard drive works and his the function.

Congratulations Bill Hammack the Engineer Guy, you have earned a spot in my heart right next to Bill Nye The Science Guy.

Thanks Bill! I have not yet seen one of your videos that I didn't like.

Very enlightening, thanks Bill. Not only am I impressed with such precision and ingenuity, there also lingers a peculiar sense of wonderment and uneasiness when I reflect upon the elemental properties making it possible. I am infinitely curious about our universe, natural laws & interplay of energy/matter & space/time constituting all we can observe and the "so much more than we can't".. (yet). The uneasiness stems from the latter due to my short lifespan, I'll never know enough to be satisfied.

Very nice ! I use this device every day and now i know exactly how it is working! Thank you very much :)

make more videos! this is so fascinating i love finding out how stuff works!

i agree, considering how well he explains things, that would be an excellent video ... Bill (and the team): great video, as always ... thank you!

extraordinary video an explanation!