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Computer Forensics World :: View topic - Volume Boot Record Structure
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Volume Boot Record Structure

 
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stupidgal
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PostPosted: Wed Jun 19, 2013 2:59 pm    Post subject: Volume Boot Record Structure Reply with quote

In VBR, there is 3 main components: volume boot code, disk parameter block and signature value right???

And, is disk parameter block and BIOS parameter block the same?

What is a volume serial number and label? What is the purpose of having it???

Btw, does anyone know how to extract a FAT12 file???

Thanks in advance!

Cheers,
Stupidgal
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athulin
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PostPosted: Fri Jun 21, 2013 5:56 am    Post subject: Re: Volume Boot Record Structure Reply with quote

stupidgal wrote:
In VBR, there is 3 main components: volume boot code, disk parameter block and signature value right???


Depends. VBR (Volume Boot Record?) could easily refer to any type of volume-specific boot (as distinct from disk-specific boot). Some VBR may split up the way you state.

The Microsoft FAT specification uses other terms: 'boot sector', 'BIOS Parameter Block', and treats the initial jump instruction as separate from the boot code, as well as the OEM name that immediately follows it.

Quote:
And, is disk parameter block and BIOS parameter block the same?


BIOS parameter block is a pretty well-defined Microsoft term. 'disk parameter block' is not a term I can identify definitely, but in the context of Windows-related volumes, I would interpret it as synonymous with BIOS parameter block.

Quote:
What is a volume serial number and label? What is the purpose of having it???


Volume label -- typically just a way for a user to name a volume. Could be done to make it easier to identify.

Volume serial number -- it's usually an attempt to make a removable volume unique. Otherwise files could be read/written from/to the wrong source/destination.

These things are covered pretty well in Brian Carrier's book File System Forensic Analysis. I recommend you get a copy.

Quote:
Btw, does anyone know how to extract a FAT12 file???


You need to understand the FAT12 file system pretty well for that -- again, see Carrier's book.
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