I have two questions:
1- What does stand for UG, BG, SG,GA in the end of ESX Patch file.For example:
ESX/ESXi 4.1.0 GA
2- what is the meaning of part of patch file name? For example: ESX/ESXi <Release>-<Date>-xx ???
UG = Update bundle
BG = Bug Fix bundle
SG = Security Fix bundle
GA = General Fix bundle
These definitions are provided in this patching document - http://www.vmware.com/files/pdf/esx_patching_best_practices.pdf
It does not go over what the last letter stands for "G" or "A"