true to form emachine don't like to give good info on its products as you can see here under specs
http://www.e4me.com/support/product_...es&model=T3304
The specs mention nothing about if its a ide or sata drive but I downloaded your manual and again no mention but according to the pics in hdd replacement it looks like a sata by the data cable they are showing.
If your data cable is 1/2 inch wide then its a sata if its 2 inchs wide then its a ide.
Assuming its a sata I would get one of these
http://www.newegg.com/Product/Produc...k=&srchInDesc=