Sandisk Micro SD card  TF   memory stick  A1 64gb 128gb 100Mb/s   SDHC/SDXC 16gb 32gb  retail package

Sandisk Micro SD card TF memory stick A1 64gb 128gb 100Mb/s SDHC/SDXC 16gb 32gb retail package

$15.37
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 A1 means that The installer for the phone is downloaded directly to the memory cardAbout Speed:16GB/32GB-Class 10 SDHC  64GB/128GB-Class 10 SDXC    Read speed around 45-50MB/S ,Write speed around 15-20MB/S   About capacity:16GB=approximately 14GB-15GB32GB=approximately 28GB-30GB64GB=approximately 58GB-59GB128GB=approximately 119GB-120GB This is calculation difference between manufacturer and our PC, please Google 'Memory card capacity' to get more information.Understanding speed classesThe 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, us

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