Tom, You've got me interested now. I MD5SUM'd my three disc2s on 4 systems: Memorex CD/NT4, Sony CD/Windows 2000, Plextor CD/Windows XP Prof &, HP CD/Fedora. They all check out. Disks 1,3,4 are all OK. I used Memorex CD-R 52x disks and burned them using Alcohol 120 on the XP machine. Alcohol 120 has the buffer-under-run switch set by default. I am going to have to research the ATA packet interface thing. Before I just swapped the 3 disc2s round robin, each disk failed on a different file during each install attempt. I made many many single CD attempts and was halfway through a six-pack when I stumbled across the round-robin scheme. CD drives are cheap and I will replace any one of mine tomorrow if I can find any evidence of failure. It just seems, to me, that the checksum tests would be adequate to determine a hardware or media failure. Thanks for your time. Dwaine
