Secure Digital memory cards.What´s the difference between High speed, Ultra II etc.?

I mean technical data of read %26amp; write speed. Which to choose for digital camera use ( 5 Mpixel CCD)

Secure Digital memory cards.What´s the difference between High speed, Ultra II etc.?
Faster cards will shorten the time needed to write the image file onto the card. However, the card is not the only factor. The speed at which the camera can process the images that you take, and the speed that it can write to the card are also factors. For most point-n-shoot digital cameras, the speed of the card is not the limited factor because the camera is slowed down by the image processing or is already writing as fast as it can, so a faster card won't help. You should either try it out at a store to see which is faster or read reviews.





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Reply:Faster cards are not so much faster in writing, this speed is mainly decided by your camera. The difference between the cards is made, when you transfer data (pictures) from your camera to your computer.
Reply:For digital camera I would say the faster the better. It is especially important if you use large size format. e.g. RAW and TIFF. For the High Speed, Ultra 2. Those are only some fancy name for SD card manufacturers to distinguish the product lines between normal speed and high speed. Just a reminder, when u need high speed both of your card and camera have to support the speed. The reason I am saying this because some OLD camera can't support the high speed of high speed card. Hopefully that answer your question.