TO all experts,

basic concept in my mind is,

H O W H D D W O R K S ?

what is service area,
how many parts in service are,
how we can find the zones,
where is trakcs,

there is no any questions,
but i think if we know the internal structure/working of hdd

we can repair hdd and recover data better,

i know, i will ask the question AND any person will answer and the problem will be solved,

but i do no want to do like that, i should know what i am doing, what will be happan after to one click,

HDD IS with 2 head (example) head 0 and 1, the head 0 reads lba 0 to38,000,000, and head 1 will read other lba ?,

if somebody give me any text/pdf file for learn about internal structure/working of wd,

thanks