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where are my partition-tables ?

Posted on 1998-05-19
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Last Modified: 2008-02-01
I would show (edit) my partition-tables with a hex-editor. So I start the hex-editor and go to position 1FEh at the first sektor of the harddisk --> and I see AAh 55h --> fine this must be the MBR.
I know, the first partition-table starts at 1BEh, the second at 1CEh ond so on.

But! At this Positions (1BEh - 1FDh) I found only the text
"Kein System oder Laufwerksfehler. Wechseln und Taste druecken..." -- ore in english "No system disk ore disk error .....".

Wehre are my partition-tables with the 16 byte Info (status, typ, start, end ...)???

Any ideas?

Bye Christian
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Question by:cbo120897
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2 Comments
 
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by:tbaffy
ID: 1016898
Christian,

You have this information correct.  The Master Boot Record is the first physical sector on your hard disk.  The offsets of the important information are:

000h  bootstrap loader code
1BEh  1st partition table entry
1CEh  2nd partition table entry
1DEh  3rd partition table entry
1EEh  4th partition table entry
1FEh  ID code (AA55h)

What it sounds like to me is that you are reading the first sector from a logical drive (partition), not the physical drive.  This would cause you to read the partition boot sector, not the MBR.

Tom
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Accepted Solution

by:
tbaffy earned 100 total points
ID: 1016899
Christian,

Sorry I posted as a comment instead of an answer so I am re-posting.

You have this information correct.  The Master Boot Record is the first physical sector on your hard disk.  The offsets of the important information are:

000h  bootstrap loader code
1BEh  1st partition table entry
1CEh  2nd partition table entry
1DEh  3rd partition table entry
1EEh  4th partition table entry
1FEh  ID code (AA55h)

What it sounds like to me is that you are reading the first sector from a logical drive (partition), not the physical drive.  This would cause you to read the partition boot sector, not the MBR. The best clue to this is how you select the drives.  If it is selecting the drive by letter (C:, D:, etc) the this is a logical drive.  If it refers to the drives with numbers (drive 0, drive 1, etc) then they are physical drives.

Tom
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