Nightwalkers - S6-E5
Corrected entry: At about 8 minutes and 30 seconds into the episode, Carter, Quinn and Teal'c are investigating the dead Dr. Richard Fleming's house. It shows a computer screen with the Disk Information open. It shows that not a single byte has been used on the disk (C: drive, so it's very unlikely a secondary drive). If not a byte has been used, why is an operating system running? (00:08:25)
Correction: The Operating System (OS) could have been placed on another partition (in order to stop the good Dr. from playing around with it -I've had to do this in order to stop small children from doing it in my families homes-) or he could have the the secondary drive actually designated as C: drive & have the computer set up so it checks the secondary drive first for the OS.