Wow, Win98 goes back some time.  There are so many ways to do what you
asked.  Probably the simplest is to have 98 installed on your C drive (or
partition).  Install the new drive (most likely you will need to format
over your existing Win2000) and then (with your Win98 drive in place)
install Win2000.  You will be asked where you want to install the new
software (probably the D drive).  The install process will create a
multi-boot loader.  When starting the computer, you will be asked which you
want to use.  This process works with most Microsoft operating systems but
they have to be installed in the order released (98, 2000, xp, etc).  Good
luck.

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