I took the filled up 32gb card out of my phone put it into the adapter it came with and then put that into the sd card reader thats built into my windows 8 laptop. Copied the entire card to my desktop and it turns out to be 37gb worth of data some how?? The 32gb card is using fat32 and the new 64gb card is using exfat...not sure if that matters in any of this? Then I copied that entire folder to the blank 64gb card and windows is telling me i only have 15gb of free space left on the card. The 64gb card seems to read in windows as only about 60gb btw. Where my extra 4gb? regardless...even 60gb minus the 37gb copied to the card should give me at LEAST 23gb....not 15gb. So not sure whats going on here??
THEN i formatted the 64gb card again using NTFS, added back all the copied files from my 32gb and it said i had about 20gb of space left. I suppose thats better but still not what im looking for and i read that i shouldnt really be using NTFS anyways. So then I tried formatting the card in my phone with TWRP and same thing happened as before, only showing 15gb of free space with the exfat format. I noticed in the windows format utility i can chose an Allocation Unit Size...I had left it at the default...not sure if I should be changing that to one of the larger numbers?
Anyway, I just want to transfer my 32gb card to the new 64 gb card and have about 32gb of free space on there....any help with this would be great, thanks!