Hard Disk Drives

[@himanshubora9885]

Thank you Abelardo for this beautiful work.

[@williamhutchinson8881]

Thank you!!!!!!!!! So much! I go to one of the top 10 public universities in the U.S. and you explained it 100 times better than my professor.

[@williamhutchinson8881]

By it I mean cylinders. I had no clue what they were.

[@gpthemba]

The way you explain, it is truly wonderful. You are the best teacher!

[@oneloveafrica8860]

wow .. it's been 10 years but still it's helpful

[@YuvarajMadha]

Great Work @Abelardo Pardo ! You have explained everything in 11 mins. You are far better than our teachers OR any Book. What do you say ?

[@anuragsrivastava5579]

Fully agree

[@johnenalstos4821]

Excellent explanation! As a constructive comment, I would say to add a little more detail and clarity around the concept of cylinders. Why they are needed, the problems it solves and why the heads move together and cannot read and write at the same time simultaneously. I say all this, as I myself am not clear on this. Again fantastic explanation. The educational aspect is surely the best characteristic of KZbin. Yoir video is one of thise that will keep teaching people for years, contributing to their lives.

[@randall4402]

Great explanation! You made that so easy to understand. Thank you!

[@jasonrg410]

Hi Excellent explanations. Some concepts were pending until now. Thanks for sharing. Regards

[@michaelgonzalez7240]

For the basic this video is fine I guess. He forgot to mention that the bottom surface is called the servo disk and data is never stored here only sector address location or the header portion depending on the format of the disk. So the address of each sector and format is on this bottom plate. The hard drive also has a memory that stores these addresses and converts them into differential current that drives the heads to almost a direct hit in the desired location before a read sector address is even initiated. To have physical sector size almost the same the most inner of the disk and the most outer portions of the disk are not used, these empty spots are used for landing of the heads.

[@abdulraheem1264]

Gracious amigo from GODAVARIKHANI TELANGANA

[@cuneytbodur6505]

Perfect !! Thank you from istanbul / Turkey

[@eilayyosfan4417]

Omg you so good at explaining thing bravo and thanks you amazing!!!

[@rajasekaranulaganathan8903]

nice video

[@frozen_tortus]

To people watching. This video is missing some very important information about space gaping, which is essential to learn to understand data recovery & deletion, and also to understand how sector size correlate with bigger/smaller sectors.

[@SearchingPeaceInside]

Beautiful Video.. Keep posting many like those .. 100 thumbs up..

[@arijitbasu4397]

Great job sir. Love from india❤️❤️❤️

[@1088lol]

Well explained! However, something is not clear to me yet. Let's assume I want to read a file on my HDD which has 5 platters. Let's also assume the file is perfectly distributed on one cylinder only. Would I then still need cylinder "jumps" after every five read/write head adjustments? Or is reading out the entire file possible merely with read/write-head switches? My idea of the pattern: H -> H -> H-> H-> H-> C -> H -> H -> H-> H-> H -> C ... etc. until my file has been read? (H := read/write-head switch, C := cylinder jump)

[@terran008]

Thanks a lot for the video, it was really useful!

[@anushaambati6916]

excellent explanation.👏👏..tqq u sir thz helped me a lot in knowing clear abt wt is cylinder, traks nd sectors..

[@yuyafujikawa1729]

Amazing explanation!

[@faizannabi1268]

good video..keep uploading

[@ballas4204]

Thank you. Nice and simple explanation.

[@piyushgtm6]

GREAT EXPLAINATION...KEEP IT UP...!!!

[@j9geek317]

Thank you, sir one thing troubles me though, how exactly is the start of a certain sector is recognized if all information is alike? I mean, isn't there a possibility DATA could be mistook for HEADER if there is nothing separating sectors ? also , don't you think tracks that are larger containing the same number of sectors as the smaller tracks is just a waste of space?

[@eilayyosfan4417]

Someone can answer that lol ??

[@kaluvanhariharan4256]

Nice explanation.will be more informative for example calculations.

[@richardwang3438]

a sector farther to the centor is larger than a sector nearer, and they still holds the same amout of bytes of data?

[@sachinpkale1]

Really nice and informative

[@govindnair8161]

Nicely Explained. Thank you sir

[@matrixate]

Bravo! Thank you sir.

[@alientezam18]

Thank you very much! BEAUTIFUL!

[@prateeksahni2923]

One doubt sir! When the tape head moves towards the right track does the disk still keep rotating or it waits till the head is positioned correctly

[@michael.5360]

I'm looking at some models whose designs seems like it was based on a mandala which looks very similar to the hard disk or the magnetic disk.

[@haya7431]

Thank you, It was great!

[@2everywhere285]

very clear explanation. Thank you

[@anuragsrivastava5579]

Brilliant explanation

[@SaipraveenSeva]

thank you sir that was fantastic.

[@sergeykorobkov9080]

brilliant!!!

[@jalaj61]

Very clearly explained.

[@RahulGupta-jw4pr]

Helps very much. Thanks.

[@bhargavjayswal7048]

Thank you it help me a lot in Linux Base device and system

[@jamilxt]

Thank you for your clear explanation, Sir ^_^

[@shubhamvishwakarma3629]

I have a Question.Information is not physical in nature then how it remain stored after power is turned off.???

[@Gaurav-bv6xr]

thnx frm INDIA

[@volodymyrromanchenko8856]

Good job!!

[@volodymyrromanchenko8856]

*explanation

[@bayviewboom4468]

2:15 Isn't that called a "block"?

[@thyagarajl5917]

Sector nothing but a block

[@yehualawsimeneh7219]

Brilliant and Excellent Nice but add Some Example

[@zainebaltayeb7546]

Great✨

[@Aniketkumar-ox5mk]

Nice Explanation

[@sheerazamushtaq368]

Sir...is this completes the disk structure of file system?

[@relaxed.stories]

In india we says ............" DHASSSSUUUUUU" sir :) thank you

[@purijagmohan]

Awesome

[@discoverindonepal]

Thankyou so much for sharing this

[@abdifatahkhalif431]

Grazie Signore

[@muhammadali1624]

thanks sir I am from Pakistan

[@asad_mirza]

helpfull video

[@elgs1980]

Thank you so much!

[@simonbui6868]

Thank you so much

[@sandhyaupreti7178]

thankyou so much 😊

[@NirmalRaphyNelson]

Thanks!

[@shwetasahu6526]

your voice is not clear enough but the information was useful

[@jemarjudemaranga9704]

Why is the 3600 RPM inversed?

[@srimany5174]

It is done to find the time taken for one rotation and then multiplied by 60 to convert it into seconds

[@shaikabid5311]

thanks

[@dr.vinodkumarchauhan3454]

I believe, disk access time = seek time+ rotational latency + transfer time. But in this video terms seem to be confused. References: cseweb.ucsd.edu/classes/wi01/cse102/sol2.pdf

[@mohammadrezamoghaddasi122]

Please add CHS addressing to this video .

[@sidranasir4285]

The data stored in Hard Disk can be directly accessible by processor * yes or no

[@athulvinayak3328]

No

[@Sujit_7541]

Most of times I didn't get your words...

[@aparnagoswami4271]

Sir please Hindi me explain

[@gulsha12]

Please explain in Hindi

[@RonilBhatiaMusic]

lmaooooooo

[@thisissharief7651]

american english is difficult to understand to indians altough they know english

[@taibadoss569]

Thank you so much!