Hitachi-LG HD/DVD drive question

A few months ago I took the hard drive out of my dad’s computer and put it into mine to transfer some files onto it. Our computers are using the same os, XP, and theyre the same type of computer. When I did this last time everything worked fine.
Now I’m trying to do it again, and I’m having some technical difficulties I suppose you could say.
The HD is a Hitachi-LG, model # GSA-H21N
its a hard drive/dvd burner combo

I have it hooked up to the slave ide in my computer.
It was hooked up to the same spot last time I did it.
But now, my computer is reading it as the dvd drive, and I can’t access the storage section of it. Can anyone help me out here? I’ve talked with a few people about this and no one seems to have any idea.
Any help would be greatly appreciated.

does anyone have any ideas?
does anyone even get what i mean?

The drive you posted is not a hard drive, nor a combo hard drive/ dvd drive, it has no storage capabilities it is for reading and writing optical discs.