On 07/06/15, g wrote: you might try verifying that system you are getting error message on has a good cd/dvd drive. burn another dvd at at least 4 speeds slower. if runs ok, bad drive. if still fails, bad drive. another way you can check is to pull iso on system you are having problem with and burn dvd. if you get error, get a new drive. -------- Above quoted -------- When I md5sum the DVD on the system I burned it on, it matches. When I md5sum it on another system, it matches. When I md5sum it on the system I am trying to install, it comes up with a different answer. I'm getting a new DVD drive.