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Hard Disk? - HSN forum

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Hard Disk?


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#1 Tay

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Posted 02 May 2006 - 06:41 PM

Can anyone tell me how data is stored and accessed on a hard disk?

#2 Dave

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Posted 02 May 2006 - 07:02 PM

if u want to be low level about it. The data is infact bits of rust tht is written to the disk. Then data is written to a hard disk it is done in terms of blocks. A block being a collection of memory locations. When a memory location is required the whole block is copied to main memory not the individual location

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#3 coca

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Posted 02 May 2006 - 07:10 PM

An application makes a request to the operating system to tell it that it needs to access the hard-drive (by calling ReadFile or equivalent), the OS then contacts the filesystem driver, which then contacts the harddrive device driver, which interfaces with the firmware on the harddrive, which accesses the data, and sends it back up the chain. 0s and 1s are represented on a harddrive as particles which can have 2 magnetic orientations (I THINK!)

Is that a good enough explanation?

You can read this HowStuffWorks page for info on harddrives!
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#4 Dave

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Posted 02 May 2006 - 08:24 PM

yeah what he said

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#5 Discogirl17

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Posted 03 May 2006 - 09:53 PM

Mmm yeh, although I'm sure thats not the Higher Computing explanation!
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#6 coca

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Posted 03 May 2006 - 10:47 PM

Me neither really >P

We weren't asked to study this in Higher computing, ask John Mallan or someone! smile.gif
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#7 John

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Posted 04 May 2006 - 12:56 PM

You don't really need to know much about Hard Disks.

What coca and Dave have said is far more than you need, but it's pretty much what Scholar says which is Heriot Watt Year 1 Computing Science, so you will be fine with those descriptions.

If you want i'll upload the Scholar PDF files to some websapce for people to access?





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