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Question about MBR

B

beyonddc

Senior member
Hi, my operating system is Windows XP Professional.

If you've 3 hard drives, 2 hard drives are for data storage only, and 1 hard drive is where the OS sits. How many MBR you should have?

Does MBR exist one per HD or one per OS?

Thanks!
 
The MBR is the code that sits in about the first 3/4 of sector zero on each hard drive. There is a bit of buffer space after that (in case you need larger mbr code), then the partition table, then an end of sector marker.

The MBR is enough code to look at the partition table, find which one is active (by the 80h marker), jump to the first sector in that partition and load the boot sector code and transfer execution to it.
 
Short answer: On MBR per disk. Which MBR code gets executed is determined by the boot disk you set in bios.
 
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