Until then it's an unproven claim.

Martin think of it like this. If your at your office and have a ton of orders or paperwork strewn all over it. How much time do you waste trying to find something vs if it was organized? Same thing applies to hard drives. If your programs are tossed all over the place the hard drive has to spend more time and effort getting everything together. The less time it spends doing this the better your performance is going to be.

Martin think of it like this. If your at your office and have a ton of orders or paperwork strewn all over it. How much time do you waste trying to find something vs if it was organized? Same thing applies to hard drives. If your programs are tossed all over the place the hard drive has to spend more time and effort getting everything together. The less time it spends doing this the better your performance is going to be.

Paul, your just Feeding the Troll (sigh)Really not worth the time. ArjenFSX, who started this post with a quite reasonable question and concern, is probably now totally confused. Unfortunatly, that is only the start of his problems. If he lost that much disk space when he defragged, then there is something seriously wrong going on on his hard drive.It is probably that loss of space that needs to be addressed first, for the sake of the health of his whole computer, and the software on it, before worrying about PMDG's 737NGX's performance in FSX. I hope he has backups of any important files !! Good luck ArjenFSX ....

Possible solutions;I'm thinking post #5 in the 3rd link should fix you up... http://www.sevenforums.com/performance-maintenance/120782-lost-space-hard-after-defrag.htmlhttp://forum.piriform.com/index.php?showtopic=24716http://www.vistaheads.com/forums/microsoft-public-windows-vista-general/212325-reduced-disk-free-space-after-defrag-vista-sp1.html

I found the solution to the problem. It's got something to do with "shadow copies". I cleaned my hard drive and removed the shadow copies, and now I have 382 GB of free disk space instead of 269GB.

I found the solution to the problem. It's got something to do with "shadow copies". I cleaned my hard drive and removed the shadow copies, and now I have 382 GB of free disk space instead of 269GB.

Glad you got that issue sorted mate.