@ keropi
I just read this from a link to another thread posted by Hans in another thread :crazy:
I used a HDD that was already partitioned with several working DOS/3 partitions and OS3.9 installed. I decided to install OS4.0 on a spare partition and selected long file names which seems to produce a DOS/7 partition. You also need to edit the DOS Type from 444f5303 by changing the last number from 3 to 7 to give 444f5307.
Obviously you must make the drive bootable and save the changes back to the drive. (I may have missed this step?) The boot priority must be higher than the OS3.9 boot partition. Once the partition has been formatted (using QUICK) I was able to install OS4.0 and it worked fine on the reboot. I've also noticed that if I want to boot from the OS3.9 partition rather than OS4.0 you have to change the boot priority of the partition for this to work (rather than selecting the partition in the Amiga early startup sequence).
Hope it could be of some help :pint:
