In our description, the speed is just for your reference, speed will be influenced by many factors, such as interface type, computer hardware grade, computer system, and test system.
The actual usable capacity is equal to 90%-93% of the nominal capacity 1. The difference of algorithm difference-there is no unified regulation on the conversion system used by the system quotient and the storage quotient, the system quotient uses the binary system for conversion, and the storage quotient uses the decimal system; Manufacturer calculation capacity method 1GB=1000MB=1000*1000KB=1000*1000*1000B Operating system calculation capacity method 1GB=1024MB=1024*1024KB=1024*1024*1024 For example, the actual capacity of a 16GB flash disk=16000000000/1024/1024/1024=14.9GB=16GB*93% 2. Data block reservation-reserve a part of good data blocks for backup to extend the service life. 3. System occupation-firmware and system file occupation
1). Please use quality USB 3.0 card reader to verify all memory card by H2testw on PC. Real memory card should pass H2testw with no error. 2). Please don’t use cheap card reader to test Micro SD card, speed of Micro SD card will be reduced by low quality card reader. 3). Micro SD memory card speed is greatly affected by card reader and the capacity you choose , USB port ect. Low quality device will 100% slow down card speed,1MB=1000KB.