The DVD burner is a LiteON SOHW-1213SX, and on a machine with a MSI 655 Max-L / Intel 1800GHz / 4x256MB RAM new (and previously) burned DVD 4.7GB (4x) discs almost freezes the machine while waits forever trying to read the discs(s); -- on two other machines, both Asus P4S800 / Celeron 2.4GHz / 2x512MB RAM, the discs is readable almost instantly.
The software is Roxio, Easy CD & DVD Creator (version 6) and or Easy Media Creator (version 7); -- depending on the discs, if they're faster than 4x then version 7, because version 6 apparently can't burn whatever discs faster than with 4x; - I tried with 6x and 8x and almost bought a new burner because I thought that was the problem, - but when installed Roxio version 7 this problem was 'solved'.
The problem's the same whether the discs are burned on the MSI or the Asus machines.
If using re-writeable discs with Roxio 'drag-to-disc' there's no problem on any of the machines, those discs are readable right away...