Here's another old comp.sys.cbm post on adding additional drives to the LTK on the Commodores , again for the benefit of new readers of the group and the increased prevalence of HDs.
I don't own a LTK for my C64 or 128 so again, this is all the info I have.
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Here are some notes on modifying a Lt. Kernal 7.1 SYSGEN disk to acommodate additional SCSI hard drives. I have only tested SEAGATE SCSI mechanisms. You will need to low level format these drives on an IBM or AMIGA. I used the SUPRA WordSync (Amiga) to low level format the SEAGATE SCSI drives.
The following GRID is from a 40/80/80 SYSGEN configured for a friend.
Using a disk/sector editor on the SYSGEN disk. Starting at Position the numbers are: