Is this a new disk? Or has it been re-formatted? If you want Windows 98 to utilise as much of the disk as possible you should use Fdisk to delete any existing partitions and create a new one. When you start Fdisk you will be asked if you want to enable large disk support - answer yes.
Note that deleting a partition erases all data from it.
Or, you can create several partitions. This is the better solution as you can install Windows 98 on the first active partition and then install your programs on a second partition and your data on a third.
If Windows crashes, corruption will only occur on the partition on which it is installed. Your data, if stored on a separate partition will be intact!
Another advantage to having more than one partition is that you can store just your page file on one partition. This will stop the pagefile (AKA swap file), from fragmenting, enhancing performance.
This is a new disk that has been formatted, with data on it,used as a secondary HD, but it appears that the primary drive (8 gigs) is now causing problems, and I want to take it off and put the larger drive on as a primary. The system is a Pentium III 450.