Hello
I'm french and I have the same problem.
I have a Sandisk Cruzer Micro 8go.
When I try to put my iso with Universal Custo, the size of my flash drive was reduce to 3.79 go
If i remove the u3 lauchpad from my key, i have 7.48 go ( Normal)
If I put the original sandisk launchpad Here it will be reinstalled and the capacity of my key is 7,48 go ( Exactly when i have bought )
I m sure it's Universal Customize who reduce the capacity, but what doing for ?
Excuses me for my bad english
Cordially