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

 A1 means that The installer for the phone is downloaded directly to the memory card

About 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-15GB

32GB=approximately 28GB-30GB

64GB=approximately 58GB-59GB

128GB=approximately 119GB-120GB

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.

About Package:

Original sandisk Card *1