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Richard Bown wanted us to know:

>How many blocks of data are allocated to the mbr ?

The very first sector, 512 bytes.

>is it the same for all OS's ?

It's not a function of the OS, it's a function of the architecture.

>what would happen if one OS used a very slightly different size mbr ?

It can use less than 512, but if it needs more than 512, then it has to
do it in stages.  This is exactly the way that lilo does it (and
probably grub too) and DOS as well.  Look up what the letters L I L O
mean during bootup (use google) to the point where it allows you to
choose which image you want to boot.

- -- 
Blue skies...   Todd      Public key: http://www.mrball.net/todd.asc
       I go online sometimes, but everyone's spelling is 
       really bad, and it's depressing."    --Tara, BtVS
Linux kernel 2.4.22-10mm.2mdk   1 user,  load average: 0.01, 0.01, 0.04
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