mbr
ozus
Trųütmån
>where does mbr really reside ???
I believe it is the first 512 bytes of the disk. I have a disk map around
here somewhere....
--
______________________________
Mike Troutman
http://www.troutman.org
http://www.zen-data.com
michael james obrien
ozus (oz...@ozus.com) wrote:
: where does mbr really reside ???
ozus
and only the primary master mbr is being read at the first boot, is this
correct ???
michael james obrien <mob...@aix07.unm.edu> wrote in message
news:9pttal$lae$2...@lynx.unm.edu...
Nick Battle
You may find the following link helpful:
http://home.att.net/~lilo-boot/howboot.htm
This ~lilo-boot site contains all sorts of interesting information about
how the boot loading sequence works and what magic to put into lilo to
get it to work.
Cheers,
-nick
Lew Pitcher
>so each hard drive has it own mbr ????
>and only the primary master mbr is being read at the first boot, is this
>correct ???
Yes and no.
The MBR is the name for the first 512 (or so) bytes of the 'master
device' on the Primary IDE interface.
>michael james obrien <mob...@aix07.unm.edu> wrote in message
>news:9pttal$lae$2...@lynx.unm.edu...
>> At the beginning of the disk.
>>
>>
>> ozus (oz...@ozus.com) wrote:
>> : where does mbr really reside ???
>>
>>
>>
>
>
Lew Pitcher, Information Technology Consultant, Toronto Dominion Bank Financial Group
(Lew_P...@td.com)
(Opinions expressed are my own, not my employer's.)
ozus
primary master is that it ????
thanks
Lew Pitcher <Lew_P...@td.com> wrote in message
news:3bc2ec08...@news21.on.aibn.com...
Lew Pitcher
>hm.. interesting do in order for a drive to "have" this sctor it must be
>primary master is that it ????
Right. The rest have a sector in the same location, but those sectors
are not MBRs. It's the fact that it's the sector that the BIOS picks
to boot from that makes it an MBR, not the location of the sector on
the disk.
ozus
Lew Pitcher <Lew_P...@td.com> wrote in message
news:3bc3297e...@news21.on.aibn.com...
Howard
Thanks for posting this site. It cleared up some issues that I have been
trying to figure out.
Howard
Juergen Pfann
>
> On Tue, 9 Oct 2001 09:30:30 -0700, "ozus" <oz...@ozus.com> wrote:
>
> >hm.. interesting do in order for a drive to "have" this sctor it must be
> >primary master is that it ????
>
> Right. The rest have a sector in the same location, but those sectors
> are not MBRs. It's the fact that it's the sector that the BIOS picks
> to boot from that makes it an MBR, not the location of the sector on
> the disk.
>
That's *exactly* the reason why I usually call the very first sector
of _every_ HD in a (x86) system "MBR" - because nowadays, most people
can boot from *any* of their IDE-/ATA or even SCSI HDs, by simple
choice in their mainboard and/or SCSI BIOS.
And even in older boxes with -for ex.- two ATA disks on one ATA
"channel", what if you shut down the box and simply swap master/slave
jumpers (and the BIOS entries, too, of course) ?
Now the 1st sector of the formerly primary slave suddenly becomes
MBR, while the 1st sector of the other disk lost that property ?
Thus, the notion of "MBR" is very volatile IMHO - you can change
"on the fly" nowadays the disk you want to boot from, so there's
nothing special about the 1st sector of the "first disk"
(not necessarily the "primary master" - you could have a
SCSI-only system, or SCSI and IDE, but boot from SCSI first, etc.).
BTW : For this considerations, I don't care at all, if a boot
attempt of any "non-first" disk _does_ work or not.
Of course, it would be very simple to arrange valid and working
MBRs on _all_ your disks by tools such as lilo (by subsequent
LILO installations, of course).
Again, IMHO there's no difference whatsoever between the 1st
sector of the "first" vs. "2nd", "3rd" disk, and so on; so why
not call _all_ MBR ?
Juergen