If you are running os 10 Which I would assume you are, you can check by doing a couple of easy steps.
1. Click on the apple logo on the top left of your screen and select about this mac
2. Click on the More info button
3. Locate ATA or disks on the left pane.
You should get a readout similar to the one below
Capacity: 149.05 GB
Serial Number: xxxxxxxxxx
Removable Media: No
Detachable Drive: No
BSD Name: disk1
Unit Number: 0
Socket Type: Serial-ATA
Bay Name: "A (upper)"
OS9 Drivers: No
S.M.A.R.T. status: Verified
were it states model number copy that portion and use google to find information about that drive