Alright, I formatted both and tried again.
Here's a comparison,
1GB Sandisk -- Full stick vs. Empty stick.
FULL
http://img.photobucket.com/albums/v6...1GBSandisk.png
EMPTY
http://img.photobucket.com/albums/v6...sk1GBCLEAN.png
The 2nd Comparison,
2GB Sony High Speed -- Full stick vs. Empty stick.
FULL
http://img.photobucket.com/albums/v6...BHighSpeed.png
EMPTY
http://img.photobucket.com/albums/v6...SpeedCLEAN.png
It does seem to make a difference if the disks are full/empty.