UBCD, Spinrite and other tools utilizing FreeDOS fail to boot on Dell OptiPlex 980 PC with the following error message:

 IntiDisk Invalid Opcode

Invalid Opcode at 03A0 0000 0F03 0D44 7C44 0B63 6218 8F15 6C6D 0D44 001E 0000 0000


The issue was resolved by changing SATA Operation in DELL BIOS from RAID to Legacy.

DELL BIOS - SATA Operation

Dell OptiPlex 980
FreeDOS 1.1.32s


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