How does a HDD handle simultaneous writing?
March 13th, 2015, 13:02
Hello there!
I would please really need some qualified knowledge from you guys. (Not just guesses)
Example 1:
Let's say I run two separate copy processes for two large files A and B.
I copy both of them from my internal to my external hard drive simultaneously.
How are these sectors physically affected?
Is every byte of A and B written in turn on the same "line"?
So if I was playing file A, would the reading head always be skipping the inbetween bytes of B, thus making reading of A slower?
Example 2:
Let's say I download a file from the Internet, move a file from my USB-Stick and run an installation: All of them on the very same HDD.
How are these sectors physically affected?
Is every byte of every file written in turn on the same "line"?
Example 3:
I CUT several files from HDD 1 and MOVE them to HDD 2, so that HDD 1 gets free space by every moved file. At the very same time I do the same from HDD 2 to HDD 1.
How are the sectors of both HDD now physically affected?
I mean by every byte I move from HDD 1 space gets free for the bytes I move from HDD 2 to HDD 1.
What is happening there?
I there some kind of messed up, irregular, uneven mix of written bytes in an inappropriate order?
Are my assumptions in the 3 examples all wrong, since copying processes reserve the space they need first before they really begin?
Example 4:
I copy 100 GB of files on a brand new HDD.
Afterwards I permanently delete a file of 10 gb size, which is in the middle of the written sectors.
Next I copy a new 30 gb file on the HDD.
How are these sectors now physically affected?
Does the writing head now "fill out" the 10 gb "gap" first and copies the 20 gb left "behind" the former "100 gb line"?
Thanks a lot!
piknockyou
I would please really need some qualified knowledge from you guys. (Not just guesses)
Example 1:
Let's say I run two separate copy processes for two large files A and B.
I copy both of them from my internal to my external hard drive simultaneously.
How are these sectors physically affected?
Is every byte of A and B written in turn on the same "line"?
So if I was playing file A, would the reading head always be skipping the inbetween bytes of B, thus making reading of A slower?
Example 2:
Let's say I download a file from the Internet, move a file from my USB-Stick and run an installation: All of them on the very same HDD.
How are these sectors physically affected?
Is every byte of every file written in turn on the same "line"?
Example 3:
I CUT several files from HDD 1 and MOVE them to HDD 2, so that HDD 1 gets free space by every moved file. At the very same time I do the same from HDD 2 to HDD 1.
How are the sectors of both HDD now physically affected?
I mean by every byte I move from HDD 1 space gets free for the bytes I move from HDD 2 to HDD 1.
What is happening there?
I there some kind of messed up, irregular, uneven mix of written bytes in an inappropriate order?
Are my assumptions in the 3 examples all wrong, since copying processes reserve the space they need first before they really begin?
Example 4:
I copy 100 GB of files on a brand new HDD.
Afterwards I permanently delete a file of 10 gb size, which is in the middle of the written sectors.
Next I copy a new 30 gb file on the HDD.
How are these sectors now physically affected?
Does the writing head now "fill out" the 10 gb "gap" first and copies the 20 gb left "behind" the former "100 gb line"?
Thanks a lot!
piknockyou
Re: How does a HDD handle simultaneous writing?
April 25th, 2015, 10:51
*push* 
Re: How does a HDD handle simultaneous writing?
April 25th, 2015, 10:57
Humm, sounds good, Just imagine the following:
You (the hdd) Surrounded by 200GB sorry 200 BOSSES
each one of them is sending/Telling you a Command to DO
HOW WOULD YOU RE-ACT??
ofcourse pissed off, and will quit working and find another job.. i guess the HDD cannot quit, because there is no other JOB to do..
makes sense now?
You (the hdd) Surrounded by 200GB sorry 200 BOSSES
each one of them is sending/Telling you a Command to DO
HOW WOULD YOU RE-ACT??
ofcourse pissed off, and will quit working and find another job.. i guess the HDD cannot quit, because there is no other JOB to do..
makes sense now?
Re: How does a HDD handle simultaneous writing?
April 25th, 2015, 11:01
there is operating system factors, caching, RAM Size, HDD Cache etc etc etc.
more than one copy operation will reduce performance of course. But the actual data you require has so many variables, really it is an unanswerable one.
more than one copy operation will reduce performance of course. But the actual data you require has so many variables, really it is an unanswerable one.
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