I'm looking to upgrade the hard drive on a 12" alum Powerbook G4 I have. I'm looking at a 100gb Seagate ST910021A 7200rpm drive vs a Western Digital Scorpio 250gb 5400rpm drive. Both have a 8mb buffer but the 5400rpm WD has faster read seek times and average latency compared to the Seagate (12 vs 10.5) and (5.5 vs 4.2). Am I missing something here? The 5400rpm drive is faster than a 7200rpm drive? Please fill me in. Thanks.