Originally Posted by Brian-bmw

The other reason is that this is not that reliable. The MKIV does not work well with copied map disks. I used to try that with my map disks, but I gave up-- my MKIV frequently crashed and rebooted with copied DVDs. I tried all kinds of media and copy programs with no success. Then, I saw many similar posts here-- that the MKIV is unstable with copies. Some folks have success, but I believe that is more the exception than the rule.