I purchased a new hard drive and put it on SATA 0 (unformatted). At the same time I replaced two internal CD/DVD devices from my one IDE ribbon with one new HP DVD burner (set to master). Threw out floppy and associated ribbon (FDD).
The goal is to boot from DVD and install OS.
But if I activate AHCI in BIOS, the BIOS finds the hard drive but loses the DVD and I get ugly message BOOT DISK FAILURE. If I enable IDE mode (disable AHCI) everything works fine.
How can I take advantage of AHCI and keep my DVD burner?
There should be an option "Combined"....then you`ll be able to use both IDE and SATA.... Google is your friend
www.google.com
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If that doesn't help and you are using an Intel chipset I've read that Intel likes RAID setting enabled. You won't be actually installing any RAID but that helps the BIOS configure the drive.
And put the floppy drive back in. Why would you toss it?