16GB Industrial MicroSD UHS-1 C0/C1 Linux

Manufacturer Part Number : Sandisk SDSDQAF3-008G-I
Interface : UHS-1 SDR104
More reliable MLC NAND memory inside

Sequential Write speed : 31.2MB/sec
Sequential Read speed : 75.5MB/sec
OS preinstalled
Ready to run out of the box

Insert the SD Card in this way

Storage I/O comparison 

To obtain the results in the storage I/O comparison graph, type the following lines at a command prompt. The first command tests the write speed, and the second command tests the read speed:

$ dd if=/dev/zero of=test.tmp oflag=direct bs=500K count=1024 

$ dd if=test.tmp of=/dev/null iflag=direct bs=500K count=1024

If you use the eMMC storage, you can get about two to three times faster storage I/O read performance. However, an affordable microSD UHS-1 card can still achieve reasonably fast speeds thanks to the advanced SD 3.01 host controller in the S805 processor.