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I have a SCSI hard disk and IDE/ATA hard disk in the same system, and I want to boot the SCSI one but the IDE one always boots first
Explanation: You have a system with both IDE/ATA and SCSI hard disks installed, but the system insists on booting the IDE hard disk before the SCSI one. Since the SCSI hard disk (usually) has higher performance (often because it uses more advanced technology) it is preferable to boot from the SCSI drive instead of the IDE one.
Diagnosis: Unfortunately, there is no resolution to this problem in many cases. IDE/ATA hard disks are natively supported by the BIOS on most PCs, while SCSI hard disks are not. For this reason, the BIOS is programmed to look first for IDE hard disks and boot them if any are found. The SCSI drives are not looked at until afterward. There are now some newer motherboards (namely the Asus boards) that have a BIOS that will allow you to select booting from SCSI ahead of IDE on a system that has both. Most motherboards do not allow this.