SATA2 HDD are great! They are fast, cheap and reliable. SATA really is a great technology! Well done HDD standards people whoever you are. SATA has been a great replacement for IDE. (It is a pity the internal connector cables are often so easily disconnected.) Firewire 400 and 800 just cannot keep up with modern fast SATA2 HDD. Apple really should use SATA2 on board ALL Macs as soon as practicable to reduce HDD performance bottlenecks and ALL Macs need external SATA2 connectors NOW so that the SATA2 HDD we are installing into external HDD caddies aren’t slowed down to a crawl (even a fast crawl) by obsolete connections such as USB2 and FireWire (as good as they are). Apple Engineers, please, please, please add external SATA2 connectors to all Macs. PeterSW