A week or two back I mentioned that I routinely replace my laptop HDDs with 7,200 rpm models and I was asked if it made much of a difference. Alas, t'was a huge post and I checked it when I didn't have time to write an extensive reply and now it's lost to me... Yes, I find it makes a big difference. The machine is far more responsive and startup /shutdown times are quicker. I've been working with T60 ThinkPads recently, most of which come standard with an Hitachi 5,400 rpm drive. My replacement drive of preference is a Seagate Momentus 7200.4 320GB. This T60 is running XP Pro and actually came with a 100GB Hitachi 7,200 rpm drive. It's a high-spec T60. However swapping to a 7200.4 still made a noticable difference. Perhaps the 16MB buffer is part of that? I've also noticed that the HDD temps are about on par with each other. Anyway, I just swapped another T60 5,400 rpm Hitachi HDD for a Seagate 7200.4 and, as it's running Windows 7 Ultimate I now have some 'hard data' in the form of Microsoft's 'Windows Experience Index' benchmarks that I can post. With the 60GB (in this case) faultless (according to Hard Disk Sentinel) Hitachi 5,400 rpm HDD fitted and a new install of 7 Ult. the WEI HDD score was 4.3. I cloned the install onto a 50GB partition on a new 320GB Seagate Momentus 7200.4 and re-ran the WEI. This time the HDD score was 5.9. So, up from 4.3 to 5.9, quite a big jump, which bears out my experience of the improved usability and responsiveness of going to a (Seagate 7200.4 in particular) 7,200 rpm HDD. The latest gen SSDs are even better (but not as much when it comes to using them as the raw data would indicate according to what I've been hearing) but at the prices and capacities currently available not a realistic option (at least for me). When I can get a nice 15" T60 with a C2D and FlexView IPS screen for less than twice what a 128GB SSD would cost me I'd rather buy another T60 for spares (as they were the zenith of laptop design and functionality IMO) or whatever than buy an SSD. Maybe next year, or the year after, when I'm sure my T60s will still be running fine and doing all that I ask of them. For now going from a 5,400 rpm HDD to a 7,200 rpm [mechanical] HDD remains the most cost-effective and noticably faster upgrade for a laptop IMO. The 'old' 5,400 rpm units get put into external enclosures here (or UltraBay adapters) to be used as data drives where their relative slowness isn't such an issue. HTH, -- Shaun. "When we dream.... that's just our brains defragmenting" G Jackson.