Replacement hard drive needed for HP ENVY 14 Notebook

Hi

I have an HP ENVY 14-1150ca Notebook PC with a SAMSUNG HM640JJ hard disk, running windows 7 service pack 1.  I ran system diagnostics on start up and got a 'Short DST': FAILED message.  Failure ID: RGDX02-5KC73T-XD6V4J-60RE03. Product ID: XG981UA#ABC.

Can someone suggest a replacement hard drive that I can order, either something similar or a bit bigger is fine.

thanks

Suzanne