Cmos setting

[Blastin]

I would like to install eprom for larger GBs, (120 GB), on MDR to HDR, is the correct format, just install eprom and use CMOS update on floppy disk? I believe Mike Rivers states, in his book, this is one method. I also, believe you need to unplug HDR, and let it sit overnight, then install CMOS from Mackie or Mike's, CD. Any help would be appreciated.