I recently purchased a 2.8 octo Mac Pro that came with a stock 200 Gig HD. I purchased a WD 640 Caviar Blue HD for a boot drive and 3x 1 Tb Samsung Spinpoints for data and backup. When I got the Mac I simply took out the stock drive, put in the WD and did a clean install off the install DVD´s. The machine performs very well when it´s running my apps, like Pro Tools, but it´s sometimes a bit fragile when performing mundane tasks like burning dvd´s while surfing safari f.eks. It tends to freeze up quite a bit. Then I noticed also that the Samsung drives I put in it are a bit unresponsive. i.e. when i move files between folders on the extra Samsungs there is a few seconds of "lag" while before I can open the folders again. I performed permissions repair on the boot drive to see if that helped and there were quite a lot of permissions that needed repairing. The thing is after I restarted the machine and performed the permissions repair again to see if it came up clean the exact same permissions were still un-repaired! All of them came up in the exact same order. Has anyone had this problem as well? I have a MacBook Pro as well with a Seritek card that does to a Firmtek 2 drive case via SATA II and those drives are much much more responsive. I can move folders around and instantly they are accessible, without any lag whatsoever. It also does not freeze up on doing these mundane tasks, and it only has 2G of RAM vs. the 16 I put in the Mac Pro. Any help advice is much appreciated.