New user - need help installing OS3.9 on large harddrive

[Framiga]

well .... the hardware you are using, can't be "evolved" by itself, beeing 10-15 years old (well amigas are "special" but not at that point)

the main problem (no offence) is the crossposting thing. It turns things in a mess.

Now is up to you where to continue this help request, because in this way, is very hard to help you further.

[Framiga]

your fault .... to ask help for installing an operating system (3.9) and then install another one (4.0), it doesn't help you nor us trying to help.

Anyway, give the whole thing a rest for a bit and try again tomorrow :-)