Hello, Vista X64 here. Setup: Main C: partition 45GB on physical drive for Vista, separate physical 500GB drive for applications/games. Right now all is at default 4KB cluster size. For the sake of preserving more VSS copies and system restore points i want to convert to 16k cluster size. For my "data" drive this doesnt seem to be a problem. Now i read its kind of tricky to get Vista to boot from a 16k cluster NTFS OS drive (tho i found an excellent posting here covering this subject). IE: Its impossible, you have to add another small 4kb "boot partition" for the BCD first. But my question is whether its actually feasable to have a 16KB cluster size Vista/OS drive. I heard people saying that the 4KB is actually recommended since the Vista memory manager uses 4kb pages....so 16kb would be a disadvantage? (At least for the drive with the pagefile). Or should i just not bother conveting the OS drive to 16kb? My setup is that on the 45GB drive is the OS, paging file (4GB)..the works. My data drive doesnt have a pagefile. G.