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.
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 TH-cam. Yoir video is one of thise that will keep teaching people for years, contributing to their lives.
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.
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)
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?
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
The way you explain, it is truly wonderful. You are the best teacher!
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.
By it I mean cylinders. I had no clue what they were.
Thank you Abelardo for this beautiful work.
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 ?
Fully agree
nice video
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.
Omg you so good at explaining thing bravo and thanks you amazing!!!
Great explanation! You made that so easy to understand. Thank you!
Gracious amigo from GODAVARIKHANI TELANGANA
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 TH-cam. Yoir video is one of thise that will keep teaching people for years, contributing to their lives.
wow .. it's been 10 years but still it's helpful
Perfect !! Thank you from istanbul / Turkey
Beautiful Video..
Keep posting many like those ..
100 thumbs up..
Hi
Excellent explanations. Some concepts were pending until now.
Thanks for sharing.
Regards
Thanks a lot for the video, it was really useful!
Great job sir. Love from india❤️❤️❤️
good video..keep uploading
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.
Really nice and informative
GREAT EXPLAINATION...KEEP IT UP...!!!
Bravo! Thank you sir.
Amazing explanation!
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)
Thank you, It was great!
Thank you very much! BEAUTIFUL!
Thank you. Nice and simple explanation.
Nice explanation.will be more informative for example calculations.
2:15 Isn't that called a "block"?
Sector nothing but a block
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?
Someone can answer that lol ??
Good job!!
*explanation
a sector farther to the centor is larger than a sector nearer, and they still holds the same amout of bytes of data?
Nicely Explained. Thank you sir
excellent explanation.👏👏..tqq u sir thz helped me a lot in knowing clear abt wt is cylinder, traks nd sectors..
Brilliant explanation
brilliant!!!
Great✨
thank you sir that was fantastic.
very clear explanation. Thank you
Very clearly explained.
Nice Explanation
Thank you for your clear explanation, Sir ^_^
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.
thnx frm INDIA
Brilliant and Excellent Nice but add Some Example
Thank you it help me a lot in Linux Base device and system
helpfull video
Sir...is this completes the disk structure of file system?
I have a Question.Information is not physical in nature then how it remain stored after power is turned off.???
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
Thank you so much!
Thankyou so much for sharing this
Thank you so much
Awesome
thanks sir I am from Pakistan
In india we says ............" DHASSSSUUUUUU" sir :) thank you
thankyou so much 😊
Why is the 3600 RPM inversed?
It is done to find the time taken for one rotation and then multiplied by 60 to convert it into seconds
your voice is not clear enough but the information was useful
Thanks!
Please add CHS addressing to this video .
Grazie Signore
thanks
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
The data stored in Hard Disk can be directly accessible by processor * yes or no
No
Most of times I didn't get your words...
Sir please Hindi me explain
Please explain in Hindi
lmaooooooo
american english is difficult to understand to indians altough they know english
Thank you so much!