When I'm booted in OS X I hardly ever hear the hard drive clicking or reading information off the disk directly after booting. But when booting into Windows 7 the hard drive clicks and reads and makes noise a lot more often. Is this something to do with the design of Windows? Like... the way data is organised on an NTFS disk/fragmentation etc? I run Defraggler pretty often, although often in Quick Defrag mode. Anyway, it was just a question, and probably a matter of operating system resource efficiency right? I.e. OS X is somehow more 'efficient' or loads crucial system files into RAM somehow better? I'm not sure, just speculating What do you guys think/know/speculate?