Big HD on LC II and MacOS 7.5

I'm trying to install MacOS 7.5 on a LC II and the disk seems to

be somewhat bigger than the regular Apple disk originally in the

box. Its a Maxtor 7120SR which I think is about 80MB.

When I try to install MacOS 7.5 from the original disks, its unable

to recognise the drive. I know this worked before on a LC II so

I'm guessing there is something I need to do first?

I do have another Mac (Mac Duo) which I could use if necessary

to set the disk up?

Thanks

Ian.