Hi to all. I am new here. Just recently my brother brought MAC laptop. The installed OS in laptop is Mac OS X Snow Leopard. Till now i am not familiar with MAC OS installation and usage. Of-Course i got info in Google and Apple website about usage and etc. But i have a few questions. 1. Now i am trying to install Mac OS X again. I searched in Apple website for any available updates for Mac OS X Snow Leopard. I saw there is an important update available. But it is available in two variants. One is Mac OS X v10.6.6 Update (Size 143.59 MB) and the other is Mac OS X v10.6.6 Update Combo (Size is 1.06 GB) I gone through detailed description about these two updates. But i am not able to find exact difference between them. Both contains incremental updates and both have nearly same description. But why one in above 1 GB in size and other is only 143 MB. Which one i need to download and what is the exact difference between these two updates? 2. Is there a way to integrate this update to Mac OS X Snow Leopard installation files and create a Mac OS X Snow Leopard installation DVD which contains both OS and update. Just like Windows 7 with Service Pack 1. If so, how the method would be? 3. Is there a tool available to customize the installation of Mac OS X Snow Leopard. Just like RT 7 Lite, which is available to customize Win 7 installation image. Please let me know answers for the above mentioned questions if possible. I already searched in Google but i am not able to find proper information. Thanks Girish G.