Do you have corrupt disk images? Are they in a format that disk copy doesn't recognize? I assume when you say it "doesn't recognize the system tools dsk", you are referring to the disk images. If you want to try some new disk images, start by downloading disk 1 of the System 6.0.8 install: http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English-North_American/Macintosh/System/Older_System/System_6.0.x/SSW_6.0.8-800k_Disk1of4.sea.bin
If you want to download disks 2-4, simply substitute "Disk1of4" for "Disk2of4" etc.
If you want to download disks 2-4, simply substitute "Disk1of4" for "Disk2of4" etc.

