How exactly do hard drives work?

[RedShirt]

I have never actually opened up and looked into a hard drive. I know they have platters and needles, but how exactly does the harddrive go about storing stuff. Does it fill one platter and move onto the next? Or does it fill each platter equally or what?

There are needles between platters... Are these needles able to read the platter above and below it, or just one? I'm just asking becausing I'm curious how exactly these things work.

 

[sohcrates]

check this out

 

[dowxp]

storagereview.com can fill u up too.

 

[RedShirt]

Read that link, it still didn't explain if one platter fills up or they all get filled up at the same time.

 

[Pariah]

Drives write down through the platters (cylinder) then in, down, and so forth.