sdspeed is the only product that measure the read and write rate and testing every bit of your SD memory card you can trust with no "conflict of interest".
sdspeed lets you verify the integrity of a flash SD card or USB device. You can test not only SD (secure digital) cards, but also USB flash drives, even hard drives that are connected via USB. It also provides benchmarks, such as the speed of a memory card, an SD card speed test, a flash card read-write test, and SD-card speed or measurement of micro SD performance. Requirements: OS X 10.7 or later Home Page - https://itunes.apple.com/us/app/sdspeed-check-speed-integrity/id1090690858 
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TO WIN USERS: If RAR password doesn't work, use this archive program:
Latest Winrar and extract password protected files without error.
