Want to install different operating systems on two hard drives, so that WindowXP is installed on the first hard disk, Linux (redhat) is installed on the second hard disk. Since NTLOADER cannot boot the operating system on other hard drives, then start the computer with the second hard disk, then set the start hard disk to the second hard disk on the BIOS. Since the front is installed, GRUB is installed on the MBR, so After starting, I entered the GRUB interface, so I could press C to GRUB command line GRUB>, using root noverify (hd0, 0), because my XP is installed in the first primary partition of the first hard disk, then Turn the first sector of the partition with CHAINLOADER 1 settings, then Boot. But the result is really guided fail, why? Later, I thought that Window can only boot from the startup hard drive, because I use the second hard drive to boot, there will be problems. So I entered GRUB>, after rootnoverify (HD0, 0), mapping these two hard drives with MAP (HD0, HD1) and MAP (HD1, HD0), when Boot, I can guide XP, this prove The previous judgment. Then enter Redhat and then modify grub.conf in the last plus title = "WinXP" rootnoverify (hd0, 0) Map (HD0) MAP (HD0, HD1) MAP (HD1, HD0) CHAINLOADER 1 will be found in the GRUB menu after restarting WinXP options, here, the multi-system boot under the multi-hard drive is completed, the grub is still quite convenient to use it. Another point is that no matter whether the IDE is represented by HDX, the number of the general IDE is before, while the number of the SCSI is numbered before.
