I seem to run into really bad slow down when I am copying (backing up) files that are larger than 2 gigabytes from Harddrive A to Harddrive B in a winxpPRO / P4 machine.

If I copy 20 600meg files (total of 12 gigs) it copies them much faster than if I copy 3 4gig files.

Is there any truth to this? Are there patches or software that aid in copying files across volumes?