All the changes in Vista SP1 are behind the scenes. It was meant for improving the performance and no change in the interface but there are indeed some changes in Windows Vista SP1 that you can actually see:

In the RTM version of Disk Defragmenter, the only control you have is over the schedule.

In the SP1 version of Disk Defragmenter, you can choose which hard disk you want to defragment during a manual operation.

In the RTM version, you can

As stated, there are no big changes.

THanks for article