SanDisk has been a leader in storage cards for years, providing fast and expansive memory in several formats. Two of their most popular card lines include the Ultra and Ultra II.
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SanDisk Ultra cards--particularly those with the newer 3.0 specification--can read data up to 15 megabytes per second. The writing speed is somewhat slower at an average write speed of 10 megabytes per second.
SanDisk Ultra II
Ultra II cards are approximately double the speed of Ultras, with read speeds of up to 30 megabytes per second and write speeds up to 15 megabytes per second.
If you need the card for an older device--for example DLSR cameras--the Ultra is sufficient speed for most storage and download needs. Devices that are used for recording or playing back streaming video would benefit from the faster read/record time of Ultra II cards.
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