SanDisk Ultra 4gbSD memory cards
SanDisk's Ultra SDHC Card is a portable Standard Digital memory device available in several different capacities. This model is one step up from the Standard SDHC Card, and the only real difference is that this model is capable of faster sustained writing speeds. It is SD class 4 certified, meaning that write rates are a guaranteed 4 MB/s, but SanDisk claims that it has the capacity to write at 15 MB/s. Ultimately this means that this card is better suited for video or rapid-shooting photography. Accordingly, these have a higher price point. This model comes in 4GB through 32GB. It is compatible with all devices that use SD card interfaces.