Hi all: Sorry for the belated posting -- a few months ago I asked for and received advice from you all on HD upgrades for my TiPBG4-800 (it came with a IBM Travelstar 40GB that had crashed hard...) I purchased a 60GB Toshiba MK6022GAX (5400RPM, 16MB cache) from a vendor on eBay and I'm very pleased with the results. Although I could not run empirical back-to-back tests between the Toshiba and the Travelstar, the Toshiba seems to be as quiet. When running OS 10.2.x, the Toshiba seemed to provide faster system performance. It was a painless installation. YMMV Jim