SanDisk Micro SD Memory Card
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SanDisk 48mb/s New Version 64gb 32gb 16gb 8gb Ultra SDHC SDXC UHS-I Class10 memory TF micro SD Card
Original sandisk Card *1
8GB/16GB/32GB-Class 10 SDHC
64GB-Class 10 SDXC
This is calculation difference between manufacturer and our PC, please Google 'Memory card capacity' to get more information.
Understanding speed classes
The SD card association defines card speeds using two terms: Speed Class and UHS Speed Class.
Speed class is the original rating used and the number defines the card speed; 4 for 4MB/s, 6 for 6MB/s. 10 for 10MB/s etc.
UHS (Ultra High Speed) uses minimum write speeds to differentiate the cards; UHS-I Speed Class 1 has a minimum write speed of 10MB/s while UHS-I Speed Class 3 has a minimum write speed of 30MB/s.
Speed based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors. 1MB=1,000,000 byte
Please don't use cheap card reader to test Micro SD card, speed of Micro SD card will be affected by low quality card reader.
The most reliable software to verify memory card is H2testw
Speed Test of 32GB Class 10 card on a Win7 i7 laptop:
USB2.0 card reader and USB2.0 interface:
USB3.0 card reader and USB3.0 interface: