Replacement HDD for HP G61 Laptop

I have a HP G61 laptop with WD3200BEVT -6023T0 ATA drive which I need to replace as it’s nearly full.

Which current HDD is compatible please?


What is the compatibility criteria of your Laptop related to supported RPM, physical disk size, cache, Interface, and storage size?

I’ve just ordered a 1TB HGST 7200rpm HDD which is physically the correct size. The original 320GB HDD (SATA) is 5400 rpm. Will this be a problem? (Not sure of Cache size on original.)