I have and issue with adding the persistence partition to my USB 32 GB. I installed Kali on a USB, and I can boot just fine, but when I try to run gparted, I get: invalid argument during seek for read on /dev/sda, and gparted exits after few more messages.
If I run gparted /dev/sdc, gparted runs, and I can see the USB, but there is no unallocated space shown. Part at the beginning is yellow, and the rest is white, clearly empty, but it is not separated, so I can't use the empty space. I have searched online, and it appears that I need to unmount a partition and try to remount it somehow, but I don't know how.
I have been a Windows user my whole life and just recently started working with Linux, so I am kind of lost. Any help is appreciated, especially if I can understand what is going on. I just installed Kali 1.0.7 x64 today on a USB and I am booting it on my laptop.
Thank you.