When I put my disgo pro into my computer it read it as an “A” Drive and will only alot 144MB. I am running VISTA. Why is this happening?

The device you have contains KeySafe software. KeySafe allows you to create a Privacy Zone on your disgo device..In order to access the Privacy Zone on Windows Vista, you will need to download the necessary KeySafe update. This can be downloaded from the following link:
http://www.mydisgo.info/archives/477
This download will need to be saved to the disgo and run from the disgo device.
You should then be able to see the full capacity of your disgo device.