1. Dos based Windows. You get only some 32,768 frames in a file. Which works out to a little over 17 minutes.

2. FAT32 file system limit of 4GB per file. DV video capture could fill that in ... 17 minutes.

Sorry, but this forum is rarely visited, but the reasons, while well known can't be shared because you didn't tell what was asked when you posted. But maybe I guessed.