I got a 16Gb micro SD to use in a raspberry pi 3, and today I installed the OS with the program downloaded from microsoft website. However I noticed that the SD card was formatted in a strange way: a main 64Mb FAT partition, a 600Mb,a 4.2Gb and another 2,5Gb all unkown and not recognized by windows. Also 8Gb of unallocated space. I know this is normal, but how can I access the data partition? What if I want to deploy a large file inside my card?