Hello all... I have a 2007 version mac mini: Model Name: Mac mini Model Identifier: Macmini2,1 Processor Name: Intel Core 2 Duo Processor Speed: 2 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 4 MB Memory: 1 GB Bus Speed: 667 MHz Boot ROM Version: MM21.009A.B00 SMC Version (system): 1.19f2 Serial Number (system): YM8052EPYL2 Hardware UUID: 00000000-0000-1000-8000-0016CBAEAB84 I am planning on upgrading to 4gb ram and am considering upgrading the internal Harddrive. I am currently using a seagate 1.5tb external to run osx leopard, am planning on upgrading to snow leopard and want to free up space on my external and start using a larger internal. My question: I don't understand the difference of Sata speeds and am wondering if there is a limitation to what this system is compatible with. I understand this system will work with a Sata or Sata 2, but everything i see lists as Sata with GB/s and i am ignorant as to what this speed refers to and if certain speeds are not compatible with my processor. if someone could help it would be much appreciated.