I love how this man explains with appreciation. This is true knowledge.
@KenArrari12 жыл бұрын
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.
@copperhamster8 жыл бұрын
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.
@williams65508 жыл бұрын
....it couldn't find the WHAT!!?? beep boop error error
@copperhamster8 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.
@williams65508 жыл бұрын
Copper Hamster That's odd. I did click show more, and that's as far as it got. KZfaq dropped the ball and made me look like a fool! Cheers to you, Mr. Hamster.
@mariusa57548 жыл бұрын
+Copper Hamster Yeah I've seen a KZfaq 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?
@copperhamster8 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.
@WulinTeo10 жыл бұрын
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.
@srimatisoren43369 жыл бұрын
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.
@anonymoususer35618 жыл бұрын
+Srimati Soren *99%
@williams65508 жыл бұрын
70% of the time, you'll damage it every time.
@NameTheUnnamed125 жыл бұрын
Hah you are fool. I unplugged it and poured vodka on it to clean it.
@torpedo9965 жыл бұрын
@@NameTheUnnamed12 Slav 100.
@VoidFame4 жыл бұрын
I already opened my harddrive a couple years ago and this video makes me want to try and get it running again.
@Shabazza845 жыл бұрын
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.
@Theunihornable4 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.
@joeevans848 жыл бұрын
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
@joeevans848 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.
@ProfessorEGadd8 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-kr9do8 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.
@happmacdonald8 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_JWS8 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.
@Zizumia7 жыл бұрын
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.
@sheilaolfieway18853 жыл бұрын
it's really just an advanced tape. a tape used the same concept, magnets.
@Dennis199013 жыл бұрын
@@sheilaolfieway1885 Your easy dismissal of such a concept tells of your ignorance on the topic.
@sheilaolfieway18853 жыл бұрын
@@Dennis19901 Your assumption proves you are a fool.
@AustinHarsh8 жыл бұрын
Been in IT all my life, HDDs and Cdroms still blow my mind. :D
@ElectricityTaster9 жыл бұрын
And one last thing: don't open up your hard-drive like that unless you want to lose all your porn.
@arbitrage21417 жыл бұрын
Evan Ohashi-White I thought it was funny
@CombineWatermelon4 жыл бұрын
no not my 30gb of robot hentai!
@JarinUdom8 жыл бұрын
Bill Hammack for President
@rogertycholiz22186 жыл бұрын
Bill is the best - he knows everything!
@Nhatanh04754 жыл бұрын
He should be CEO rather then President.
@saiprashanth5924 жыл бұрын
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! :)
@GunsNGames15 жыл бұрын
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.
@AIEmporium7008 жыл бұрын
This is why Illinois has the best education level in the country. We NEED more professors like him all over the world!
@dezent10 жыл бұрын
For everyone outside Liberia, United states and Myanmar... three hundredths of an inch is 0.762mm.
@patrickfreeman8257 Жыл бұрын
I had my doubts that you could cover this whole topin in 5 minutes but you proved me wrong. Well done, as always
@imadgibbs906310 жыл бұрын
Your best video Bill, nicely done
@klesstwo13 жыл бұрын
How could you possibly dislike something remarkable like this..
@MamboBean3438 жыл бұрын
+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?
@SianaGearz7 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).
@dave-io11 жыл бұрын
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!
@1metiz8 жыл бұрын
That clicking at the beginning made me realy nervous
@sillysad31988 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...
@fredfindl8 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....
@thethreemusketeers15508 жыл бұрын
This was very useful, I didn't realize just how closely linked physics and computer science was. Thanks for helping me understand.
@keistzenon95939 жыл бұрын
would be awesome if there was an ssd video
@mariandreemorales88611 жыл бұрын
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.
@Oslokiddo9 жыл бұрын
when nasa went to the moon they used paper with holes in them as storage. and look at us now. wow!
@sillysad31988 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.
@jogrobler8 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.
@dannyleung27967 жыл бұрын
Punch cards and paper tapes are for data and program input only. Data was stored on magnetic tapes.
@40Sec7 жыл бұрын
Silly Sad - Haven't seen those pictures of Pluto, have you?
7 жыл бұрын
Are you talking about punch cards? That was for programming. They stored the data in giant magnetic cartridges.
@50centgotshot9times5 жыл бұрын
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.
@lopyus8 жыл бұрын
I took a break from studying remanence, coercivity... etc in physics and clicked on a video which contains that. XD
@paraseth5 жыл бұрын
Simply amazing! I am a physics postgraduate. I know the physics, but to see the use of this in hard drive is wonderful
@nickrulercreator8 жыл бұрын
So how about solid state? How do they work?
@mcjay6698 жыл бұрын
nickrulercreator it's just flash memory, there's no moving parts
@PianoScenesMoviesandSeries7 жыл бұрын
@OldSoulPortal I laughed and spilled my coffee.
@Kidsvids827 жыл бұрын
OldSoulPortal made my day bruh hahaha
@SianaGearz7 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.
@justpassnthru4 жыл бұрын
*I* 's and *O* 's
@ovalwingnut6 жыл бұрын
I didn't think I would glean so much info in 5 mins. Thank you.
@DarthSinistris10 жыл бұрын
More importantly, WHY AM I NOT SUBBED TO YOU???
@DashRantic5 жыл бұрын
did you ever figure that out?
@SamieOld13 жыл бұрын
Thanks, this always fascinated me how many trillions of bits of information may be condensed like this!
@LazyScoutJace8 жыл бұрын
Jimmy Fallon should put a "Thank you, Engineers" bit for this instead of dumb thank yous to Caitlyn Jenner or whatever.
@workhardism8 жыл бұрын
Correct. Agreed.
@fartsnstuf6 жыл бұрын
no thanks, I wouldn't want an unfunny jackass thanking people for actually doing stuff
@spaceghost89955 жыл бұрын
Why are you talking about Fallon ?
@dfs-comedy3 жыл бұрын
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!
@kingdavewoody8 жыл бұрын
so basically a hard drive is like a record player but the record is made of metal and the needle is made of magnets.
@Matticitt8 жыл бұрын
Not really. And it depends whether you're talking about CDs or Vinyl.
@daveslady5713 жыл бұрын
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.
@Sim_Pole8 жыл бұрын
P-put a magnet in it
@johnathankrausrig92377 жыл бұрын
the harddrive is broken after you applied force on the screws while opening it
@Theunihornable4 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
@HenryKamp12 жыл бұрын
You are doing a great service to humanity, Mr. Hammek. Thank you for your videos.
@NinuRenee6 жыл бұрын
Ooh a Pentium 4!
@ibrahimalowonle91063 жыл бұрын
These engineers dont get enough credit. This is absolutely amazing technology. God bless those brilliant engineer minds.👏👏👏👍
@powder-phun94910 жыл бұрын
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-phun94910 жыл бұрын
but if my change would in the middle of that sector, I would have to change almost 2000 bits?
@powder-phun94910 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-phun94910 жыл бұрын
Got it.
@Matttix12 жыл бұрын
It just blows my mind how any human being can consider this not interesting. It's so amazing it moves me, like art.
@BunnyRaptor7 жыл бұрын
"A home computer must store data reliably to work well or else it's pointless. Enter the Chromebook.
@ahall98395 жыл бұрын
Which still needs to store data reliably to work well. It doesn't just magically teleport the internet onto the screen.
@balajijohnson65805 жыл бұрын
God.....he should be having 50 million subscribers right now....for his work and knowledge
@PeteRoy9 жыл бұрын
Now do a video about how SSD work
@9000888sora5 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.
@stevemadison78955 жыл бұрын
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!
@Mex1CanJack9 жыл бұрын
Dat red shirt, tho.
@nebula29334 жыл бұрын
Now consider that all of this amazing innovation has had 9 WHOLE YEARS to progress even further since this video was uploaded.
@XequlixX9 жыл бұрын
somebody is copying your video 4iaxOUYalJU
@MadSparks1648 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.
@RapidGamingStudios13 жыл бұрын
I must say, I enjoy these videos a lot and learn more about computers than i ever would in a class. Thanks.
@Saral4518 жыл бұрын
So basically my porn collection is just 1's and 0's.
@lolioliol3608 жыл бұрын
+Saral451 and any profile youve made or videos youve watched or friends pictures youve seen or messages youve sent.
@thedocumentarian72598 жыл бұрын
+Saral451 Hot or not.
@kingdavewoody8 жыл бұрын
+Saral451 1's are dicks and 0's are the things that dicks go in
@LaplacianFourier8 жыл бұрын
How is that different from penises and holes?
@williams65508 жыл бұрын
1+0=good; 0+0=good; 1+1=not so much.
@MrFreeElectron13 жыл бұрын
@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.
@opfinderHarald10 жыл бұрын
Metric dude. Dont you engineers use metric?
@Xanifur10 жыл бұрын
nm is metric, he just used the football field as an example for us 'murricans.
@opfinderHarald10 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"
@you23810 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.
@uberLejoe9 жыл бұрын
He's an American, he was raised imperial... It's how we speak, it's in our euphemisms, deal with it...
@ib9rt9 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.
@trueopsimath6 жыл бұрын
The old IBM System 36 (a mid-range, mainframe-type machine) hard disk units had a clear plastic cover and they were arranged so that you could open up the door to the back of the main unit and watch it work. It was a selling point. After all, if the company spent a ton of money on a computer system, the execs wanted to be able to see it doing something -- even if they had no idea what they were looking at. I used to love to show off the machine back when PCs still just had floppy drives. I would kick off a really disk-intensive program, then open up the back of the cabinet so my friends could watch it work.
@ani62513 жыл бұрын
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!
@BlighChannel12 жыл бұрын
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!
@unlokia8 жыл бұрын
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 KZfaq, and so concise and short. God bless you, thank you, from England :)
@FeelYourMind13 жыл бұрын
The read/write head is actually so close to the platter that a smoke particle can't even get between the two. Amazing!
@craigmoritz4 жыл бұрын
Finally, an educational program that shows the math. No math=Casual conversation, Math=science!
@bk813 жыл бұрын
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!
@lichto200512 жыл бұрын
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.
@magicalrobster4 жыл бұрын
I've dismantled quite a few of these at work. I've got a couple of lovely old hard disks one from 1988 amd one from 1983. The 1983 one is only a few hundred mb and needs a seperate drive motor to power it. It's huge but a great piece of history
@stogielicious746310 жыл бұрын
the world needs more people like this guy
@williamcorcoran88423 жыл бұрын
Hi Bill, great video! Too short though! Hey, I think it’s worth noting that disks are the last mechanical frontier remaining in computers and it’s now disappearing. Next, it’s worth noting that 25 years or more ago, when a hard drive crashed in most large systems, they would send out the emergency repair crews. However, nowadays, the hard drive is so inexpensive, larger servers have redundant hard drives that make a crash a trivial event--so long as you replace the failed disk mech.
@Damoclian13 жыл бұрын
you make such complex machinery much easier to understand, thank you!
@AustinSpafford13 жыл бұрын
Oh man, I didn't know this was one of Bill's videos until I heard the intro music. Great theming!
@MIlhamP7 жыл бұрын
0:03-0:15 omg the sound is so satisfying reminds me of those days
@GeraltBosMang11 жыл бұрын
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.
@Je7k9b813 жыл бұрын
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.
@randybork44933 жыл бұрын
Great video! When he notes how the heads were moved he references a 'voice coil actuator.' I was curious about that term when I began in the industry [over 40 years ago]. It is one of those legacy terms with roots in audio speakers. Early drives had hydraulic actuators. You can imagine the failure modes that lead to! Someone suggested using the same technology that moved speaker cones, and the Voice Coil Actuator was born!
@NoelMacaldo13 жыл бұрын
I'm an engineering student and I love all your vids!
@Good_Username3 жыл бұрын
This is really impressive engineering, how do people com up with this? And not only store that information but actually use it like gaming, just wow
@Kazahmish13 жыл бұрын
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..
@DatamedicsRecovery8 жыл бұрын
Wow! I'm a data recovery technician and I love criticizing video's about hard drives, but you gave me nothing to pick on. The video was actually quite accurate, and I'm glad you mentioned Partial Response Maximum Likelihood. Even a lot of data recovery guys still think HDD's write straight ones and zeros with no understanding of this concept. I suppose if I want to get really picky, I could mention that the most modern drives actually magnetize the platter vertically by turning the coil & core to push/pull up and down against the platter rather than magnetize it laterally. Just another way they figured out to make data more dense.
@ProfessorEGadd8 жыл бұрын
+Data Medics Well in that case you'd also want to point out that the read head is not inductive anymore but instead exploits giant magento-reistance GMR, you nerd!
@maxreichelt8 жыл бұрын
I'm not sure if this is too in depth, but giant magnetoresistive heads have replaced ferrite heads for reading, in addition perpendicular magnetic recording has significantly increased areal density. It would be really cool to revisit these technologies, as despite SSDs, hard drives don't seem to be going anywhere in bulk storage applications.
@DJVADO1712 жыл бұрын
i had no idea that so much engineering went into such a simple tool...wow! +1 sir
@marianaperez464111 жыл бұрын
Amazing! I like the way he explains it. Is good to know how the hard drive works and his the function.
@thomas_tk3303 жыл бұрын
It's really amazing how far we've come as a species. All the wars humanity has ever fought have been made worth it thanks to these advancements.
@DreadThePillow13 жыл бұрын
Congratulations Bill Hammack the Engineer Guy, you have earned a spot in my heart right next to Bill Nye The Science Guy.
@BelowGroundInnovations13 жыл бұрын
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.
@AdultsSwim113 жыл бұрын
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.
@anthonyspecf12 жыл бұрын
Someone correct me if I'm wrong, but the video The Engineer Guy did was a tear down of a LED monitor. The LED label refers to the back light and not the screen. Basically an LED monitor is an LCD that uses LEDs for lighting. Traditionally LCD TVs used lamps for lighting instead of LEDs like laptop monitors and portable devices (hence the thinner screens on those devices). Now LCD TVs are being made with LED lighting. This is why they are thinner and more energy efficient.
@sillysad31988 жыл бұрын
not enough information on the topic of the airborne heads. the physics of the process is amazing and deserves a whole episode.
@yourfullofsheite13 жыл бұрын
Nicely done! Complex information put simply.Gives me the illusion of feeling smart, and the knowledge I am a little less ignorant
@alphabeets13 жыл бұрын
Awesome video. I always love to see a new one posted. Thanks.
@UncleSpuddy5 жыл бұрын
I made a fridge magnet out of a hard drive. It will hold a stack a paper roughly 1/4 in thick. It was really hard to remove before I put a handle on it.
@pilatevann13 жыл бұрын
Your videos are always very articulate and informative.
@burtlade17053 жыл бұрын
Thanks Bill! I have not yet seen one of your videos that I didn't like.
@Logarhythmic13 жыл бұрын
This is an incredible video for an incredible piece of technology. More please!
@jlamoree13 жыл бұрын
Another fantastic video. I had no idea that it was aerodynamics keeping the head at the right distance from the platter.
@voidofdeath13 жыл бұрын
So much complexity behind this 'little box' in our computer. Very well explained. Informative. Thanks. I sub.
@RoiAtalla13 жыл бұрын
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.
@almandinefox51605 жыл бұрын
the sound of it spinning is so nostalgic
@planetrob55513 жыл бұрын
Just WOW. Hope everyone really knows just how marvelous this technology is.
@sandhyasaini35487 жыл бұрын
Just a small correction. Coercivity doesn't mean that a substance will maintain the field for longer; that property refers to Retentivity.
@blackstone17766 жыл бұрын
Great video bill! You have illustrated parts on a hard drive i did not know. This is comming from some one who is extremely tech savvy. I can repair pc, home appliances, cars, and general elecronics. Keep up the good work.
@lolmhao3 жыл бұрын
This is an amazing video. Really helped understanding how everything works
@esclrocks13 жыл бұрын
Very interesting video! However, I'd like to add that newer drives use Perpendicular Recording, which places the magnetic sectors in a perpendicular configuration relative to the platter surface. It allows for even smaller sectors.
@MrFreeElectron13 жыл бұрын
Mistake 1: The VCM IS temperature dependent the resistance of the coil changes roughly 20% between ambient ( 25 C ) and operating point ( 60..80 C ). Changing resistance means changing current. changing current means changing speed. changing speed means different time to perform seek operation. This is being compensated by a control algorithm. The headstack actually has a temperature sensor on board.
@Makbeefy12 жыл бұрын
Love ya, Bill. Keep up the great work. This video was well-presented, interesting, and VERY informative. Thanks!