I purchased this HD, thinking it was compatible with the early 2008 iMac, but opening it up, it seems very small and thin, maybe too small. I'm wondering if it is the right one. It's this one- Amazon.com: Seagate Momentus 320 GB SATA 7200 RPM 2.5-Inch Internal Hard Drive ST903203N3A1AS-RK: Electronics
Is this compatible?
Is this compatible?