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I'm trying to backup a copy of leopard I'musing a memorex DVD+R DL but I'm getting disk checksum error on 3 disks in a row.
My experiences with writeable dual-layer DVDs have always been a bit flakey...Success with burning double-layer and dual-layer disks is somewhat random. Some burners don't like certain media. Finding compatible media for your burner will be a matter of trial and error. If DVD+R disks are giving you trouble, try DVD-R disks instead. Also try switching brands. And, as always, burn at slow speeds.
And by the way, it's legal to make as many back up copies as you want as long as they're only installed on the same machine.