I am going on a trip to see several National Parks in September.
My Camera is a Canon PowerShot A710 6x optical zoom and has 7.1 Megapixels.
I have two questions:
Currently, I have three 2 GB cards and I wonder how many photos I will be able to store on them?
I noticed that two cards are marked Hi Speed, the other doesn't have this marking. What difference does this make?

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