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?

  • What did you use to format it?
    – Dylan
    Commented Mar 29, 2016 at 16:43
  • I have used the Windos IoT core installer that flashed the SD card and partitioned it
    – Mauro F.
    Commented Mar 29, 2016 at 16:51
  • No, I'm asking what you used to clear the SD card before hand.
    – Dylan
    Commented Mar 29, 2016 at 16:52
  • I bought it today at supermarket and it was formatted with FAT32, I just inserted into my pc and flashed it, nothing else
    – Mauro F.
    Commented Mar 29, 2016 at 16:55
  • If you have a Windows PC, download the official SD Card Formatter and format it completely there. The Windows 10 IoT installer should set up partitions for you.
    – Dylan
    Commented Mar 29, 2016 at 16:56

1 Answer 1


Well, it looks like there is no way to do it from the SD card, but because I installed Windows IoT, there is a built-in FTP and file sharing server. To access them, just turn the raspberry on and:

  • for the FTP connect to ftp://
  • for file sharing open file explorer and type \\c$

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