I’m trying to create a persistent installation of Parrot OS on my 16GB USB flash drive. I made the mistake of making the USB flash drive bootable without partitioning the drive into 2 in the beginning. Now I am unable to revert the USB flash drive back to normal. 

I am using macOS. When I open Disk Utility the USB flash drive is only recognized as 701KB and I am unable to erase it using the `diskutil` in the command line since it gives the error:

> 
> The chosen size is not valid for the chosen file system.
> 
> 
> 

Any help is greatly appreciated, thank you.