This is more like it!
Nice script Rhys!

@Napalm: Yes we should be able to get a hold of some free mp3s and 300-600kb sized free pictures and make a let's say a 1GB folder containing 50% mp3s and 50% pictures.
The iso file should be a DVD sized one IMO. So maybe compiling a some DVD containing any free material and making a +.iso image of it for large file R/W testing purposes

As for DVD shrink I'm not really sure what you mean... doesn't the time measured for DVDshrink completion depends mostly on your CPUs transcoding abilities. I never used/saw that file copy option in it IIRC