The DVM7400 has been tested with Compact Flash cards up to 8GB. This is approximately 2 hours of video. (About 15 minutes per GB at 8Mbps).
Sandisk Ultra II cards are recommended.
The maximum supported video file size is 2GB. If you have a longer video, it has to be separated into 2 or more clips and played seamlessly.
The largest compact flash card that has been tested is a 32GB comact flash card by Transcend. It can be found on Amazon.com here:
http://www.amazon.com/Transcend-TS32GCF133-133x-Compact-Flash/dp/B0012Q2PD6/
We also recommend using Sandisk brand cards.