How to check storage size

For android phone, you can find storage size from Settings > Storage

But for developer, this information (16G) is not enough.

Just like we right-click the removable disk and then select "Properties". We can also check the total byte information of android phone storage.

First, enable USB debugging and use adb tool to check emmc size.
$ cd sys/block/mmcblk0
$ cat size
cat size
30785536

The number 30785536 is block number.
Total size is 30785536*512 =  15762194432 bytes