You should be able to use any 2.5 inch laptop hard drive. When you remove the existing Dell drive, it may have a proprietary connector on it which has a different pin layout to the one you would normally get with a drive. The new drive wont fit in the laptop without this connector, but you can usually remove the connector from the dell drive and stick it onto the new drive without any problems. Just be sure to align the Dell connector properly when you place it onto the new drive. The Dell hard drives always seem to be in strange locations to me. Rather than behind the battery or behind a hatch, some require you to unscrew the audio panel on the side and slide that out to access the drive caddy.