64gb Micro SD that only works 3gb, help!

[kharl]

Hi, this is a 64GB micro sd card that i used for installing Android 7 in a Nook HD, i used win32diskimager-1.0.0 to install those files in the card and to make it bootable...

but today i went to use the card and it looks like a 3gb card, what did that program do to my card?

 

[file3456]

It just partitioned the space needed for the installation files. If you're done with it just right click the F partition and delete. Then right click and format.