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In Android 6 I formatted my 32GB sd card as internal storage. What I now see with GParted on my desktop is this:
GParted

As you see there is still an unencrypted, readable FAT32 partition.
I assume it was created when formatting this sd card, because there I still had some large ZIPs (previously used for flashing) on my sd card.
I am a bit surprised to see that the data is still there - especially as the guide when formatting the sd card clearly states all data will be removed. Possibly the files are also added afterwards as I used TWRP to copy some files to /external_sd even after I did this.

So I deleted the unnecessary ZIPs on my PC and now I obviously have unused space on my sd card. So: How can I expand my sd card?

It is also interesting what Nemo shows me: NemoLinux

The yellow parts are the used space (98,3 kB) and the blue on is empty (31,4 GB). It also claims the file system would be msdos...

Just FYI: Besides my ZIPs there are also empty folders called "Android" and "LOST.DIR".

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    FYI: The LOST.DIR is always created on FAT partitions (by/for chkdsk). And do you really bother for that small amount of storage? Wouldn't make that much difference I'd say. Also not sure if it maybe must be there (the formatting process might have its reasons to leave it). As for reading the partition with the "unknown file system" ("unbekannt") on your PC, you might wish to see Corrupt SD card formatted as internal storage. – Izzy Mar 27 '16 at 13:04
  • Yeah, I am more curios about what caused this than worried about the "lost" space. At least it are 16 MB. Thanks for the FYI BTW. – rugk Mar 27 '16 at 13:37
  • Additionally theoretically another user could have the same "problem" with a larger FAT32 partition. I assume it depends on the files you previously had stored on the sd card or you later stored on the sd card. – rugk Mar 27 '16 at 13:39
  • I thought of that, yes. But it's purely hypotetical. Formatting as internal storage is an automated process, nothing a user does "with accidentally wrong parameters". But sure, the "why" is an interesting point, and may offer additional insight into the process/feature. – Izzy Mar 27 '16 at 13:43
  • You have a 32GB card, and not a 64GB as it feels as per question heading.If you are running gparted in linux you can unmount and delete the little 16mb patrition. – Iftekhar Mar 29 '16 at 18:43
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Not knowing exactly I believe that Android 5.0 and newer has gone and caused protection on orphaned memory space. I would like to know more about situations like this.

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