John R Pierce wrote:
> On 6/5/2014 10:47 AM, Timothy Murphy wrote:
>> Is this strictly true - that only the MBR is read at boot-time?
>
> the MBR has two elements.
>
> A) the boot code, which is read and executed by the BIOS at boot time,
> only on the boot drive
> and
> B) the master partition table, which is read on any drive when its
> inserted
That doesn't really answer my question;
I know (roughly) what the MBR, ie the first 512 bytes, contains.
But I notice that my laptop, for example, leaves 64 sectors
for something at the start of the disk;
and when I get the first 2048 bytes with
sudo dd if=/dev/sda of=sda.mbr bs=2048 count=1
I see that there is plenty on the disk after the first 512 bytes.
(Admittedly Windows might have written that, as I have a Windows partition.)
But does Linux ever write anything in bytest 513-1024, for example?
Does grub2 write more than CentOS grub?
It seems to me to be difficult to have CentOS and Fedora
as alternative OSs on the same machine?
--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin 2, Ireland
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