My Hitachi GD 7500 does not read my Civilization 4 or Civilization 4 beyond the sword dvds, although every other dvd and all cds I've tried in it work perfectly.
No error messages are displayed with the civ dvds, the drive is simply displayed as empty in my computer.
I was able to use my civ 4 dvd in my old dvd drive, before that broke.
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