I've change the default 1024kb, but only for large volumes use do record MP2. The max is 4096kb yes I know that. But the default can be changed in NTFS. I do this for newer drives. Again only on media servers that record video media when the file size is larger. Thus helps waste less space. Now if you have smaller files than 512kb would be enough. I have no problems using 1024kb on my HTPC box. Again now on the OS/Program HDD, just on secondary master this would be changed.