Right, I will first explain my second post since that was mis interperited. That was not aimed to be an insult, if aimed as an insult it would have been more direct. I asked for that answer because I did not structure my question correctly. There was no offence intended. Back to the question: I have a SATA RAID setup on my computer, this is a RAID 0 config, so there is no data redundency, just speed. I have setup the arrey with a cluster size of 16K after that being recommended as the better performence setting for my computer. This is all well and nice, however windows when issued with a format command from either the setup utility, windows format or DOS format will format the partition with a an allocution unit of 4K. For best performance the 2 units should match (and I know how 4 goes into 16, 4 times so is shouldnt be a problem), but for the effort of setting it up for performance it may aswel be setup correctly for windows also. So the main part of the question: After you put this nice CD I have made into the drive, it boots, formats (as 4K) and installs windows. BUT can I alters something in the setup files that will force windows to set its default allocation size to 16K. I think that looks a bit better now.