install boot sector

[JD]

On 09/27/2011 06:45 PM, mickey wrote:
> On 09/27/2011 09:00 PM, JD wrote:
>> On 09/27/2011 05:19 PM, mickey wrote:
>>> F15
>>>
>>> Setup F15 hard drive on a different computer /dev/sda and sent hard
>>> drive to a friend to put in his computer as /dev/sdb , behind WindowsXp
>>> and went into the rescue mode to run grub-install /dev/sda , getting a
>>> error message;
>>>
>>> "sdc2 Does not have any corresponding BIOS drive".
>>>
>>> There is only two hard drives and a DVDrom in this computer,  I can't
>>> understand the sdc2 unless fedora see's this
>>> drive , slave hard drive as sdc2 instead of sdb2 , partition 2 is where
>>> the / partition is for Fedora.
>>> WindowsXP is on Master drive.
>>>
>>>
>>> Hard Drive is recognized by BIOS as a Slave sdb.
>>>
>>> I guess the Device map is different and causing problems, How do I fix
>>> this to get boot sector on /dev/sda
>>>
>>> Can the command  grub-install --recheck /dev/sda fix the problem.
>> I thought you have to edit grub.conf so that
>> boot=/dev/sda<<<<   Point this to correct drive like /dev/sdb
>>
>> splashimage=(hd0,1)/boot/grub/splash.xpm.gz<<<   Change this to correct
>> (hd1,0) as an example
>> hiddenmenu
>> default=0
>>
>> title Fedora (2.6.39.3-1.fc14.i686)
>>            root (hd0,1)<<<<   Change this to (hd1,0)
>>            kernel /boot/vmlinuz-2.6.39.3-1.fc14.i686 ro root=/dev/sdb
>> rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8
>> SYSFONT=latarcyrheb-sun16 KEYTABLE=us LANG=en_US.UTF-8 nomodeset
>>            initrd /boot/initramfs-2.6.39.3-1.fc14.i686.img
>>
>>
>> Then you must fix /etc/fstab so that
>> /dev/sdb1 /     ext3    defaults        0 0
>>
>> ...etc.
>>
> Are you sure the (hd1,0) instead it should be (hd1,1) because linux / is
> at sdb2 .
Well, the default correspondence between bios disks and linux disks
is
hd0  sda
hd1  sdb

I assume your linux is installed on first partition of the disk.
Since the linux disk is the second disk in the machine, per your
message, then the disk is hd1 (i.e. /dev/sdb)
and since linux is on the  first partition, the boot
disk would be
(hd1,0)  which maps onto (/dev/sdb1)

Take a look at the file /boot/grub/device.map

which shows the most basic device mapping, like
(fd0)   /dev/fd0
(hd0)   /dev/sda

Good luck