Boot Knoppix 5.3.1 failed!

[kobeljf]

I try to boot Knoppix 5.3.1 from a sata cdrom.If I set the sata mode to "Enhanced IDE" in BIOS,everytime i receive the same error:

Can't find KNOPPIX filesystem, sorry!

but if SATA mode set to "AHCI" or "Compatible IDE",it boots successfully!

I need to set SATA mode to "Enhanced IDE" to boot knoppix,how can I do ?

anyone have any ideas that might help me out?

Thanks a lot!