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Faster and Cheaper SDHC UHS-1 card
on May 15, 2012
This is my second SanDisk Extreme 32GB SDHC UHS-1 card. First card (SDSDXR3-032G-A21) is the 30MB/Sec card that says HD Video on the label. This new card (SDSDX-032G-X46) is the 45MB/Sec product replacement for this class. Using a card reader that is USB 3.0 and UHS-1 capable, CrystalDiskMark was run for 50MB, 100MB, 500MB, 1000MB, 2000MB, and 4000MB loads. The sequential read and write were very consistent for this card, 45MB/sec and 43MB/sec respectively for reading and writing. Retesting the -A21 card showed consistent rate of 45MB/sec and 34MB/sec for reading and writing. It appears the new and improved SanDisk Extreme card writes about 25% faster.
Isn't it all about the writing speed?
Class 10 mandates a minimum sustained rate of 10MB/sec read/write speed. UHS is an enhancement to original SD specification in the SDA 3.0 specification for SDHC and SDXC. UHS-1 is also a 10MB/sec minimum sustained specification. UHS is a faster bus for moving data. There is UHS-50 and UHS-104 for 50MB/sec and 104MB/sec, devices are not there yet. UHS-1 is backward compatible with SDHC. Beware of SDXC, if your device does not explicitly support the extended capacity card, this will not work for you.
If your camera supports UHS-1 and takes advantage of higher write speed, you can take big pictures and be ready to take another - quicker. 25% quicker than the previous version of Extreme UHS-1 SDHC card from SanDisk. 32GB will store over 4300 pictures for me at highest resolution, or at lowest resolution - over 48,000 pictures. Don't forget to backup, that's a lifetime or two worth of images.