Are Directories stored at physical or logical adress?

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im reading operating system concepts book by Abraham. I was wondering where are the directories stored? physical or logical adress! explain a bit please.

Posted 30-Apr-12 22:15pm

Ghost_x

Updated 30-Apr-12 23:36pm

Richard MacCutchan

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Richard MacCutchan · Answer 1 · 2012-04-30T23:38:00

Solution 1

Both. When referencing files and directories on a system, the user level (or higher kernel level) code will address them with logical addresses. However, the actual disk driver will address them by converting the logical addresses to physical in order to read or write specific areas of the disk.

Posted 30-Apr-12 23:38pm

Richard MacCutchan

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Ghost_x 1-May-12 11:40am

Can you explain a bit more about the "user level code will address them with logical addresses" or refer me to something?

Richard MacCutchan 1-May-12 12:28pm

A physical disk can be partitioned into multiple sections, so section 1 would start at location 0 and section 2 at location 1,000,000, for example. However at the user level you would address section 2 by logical addresses that start at 0, and the driver would convert that to the physical address of the disk, offset from 1,000,000.

I don't know of any references for this but I'm sure Google could help you.

Ghost_x 1-May-12 12:30pm

A'right thanks. It really helped!