I am working on a site for a company selling hard drives and they would like the customer to be able to search by the type of drive. (check out the site here)I have made a custom product for them that includes a type and capacity. The type of drive and the drive capacity are not shown on the category page so I need to know:

A) how to add that to the category page,

and

B) how to make a drop down that would filter this information

Thanks
Chandra