@alan-ezust,

It is important that gparted can read the typical file systems of
[hybrid] iso files *cloned* to USB drives and memory card. One reason is
that otherwise people will think that the file system is damaged, when
it is actually exactly what it is supposed to be. The *Ubuntu Startup
Disk Creator* (alias usb-creator-gtk) in 16.04 LTS and newer versions is
a cloning tool. *Disks* (alias gnome-disks) and *mkusb* (when making
live-only boot drives are also cloning tools.

But it will not be possible to edit the partition table and create a new
partition after the partition(s) with iso 9660, because this whole
partition table is read-only by its nature. It was designed for optical
media (CD and DVD disks).

So if you wish to use the extra space, you can should use a tool that
*extracts* the content of the iso file to an already created file
system. One alternative is a *persistent live drive with mkusb*, which
uses a partition with the label 'casper-rw' and an ext file system for
persistence and another partition with the label 'usbdata' and an NTFS
file system for general storage and communication with computers running
Windows.

*Unetbootin* and *Rufus* are extracting tools also when creating live-
only USB boot drives.

Finally, mkusb can *restore* a cloned USB boot drive to a standard
storage drive with an MSDOS partition table and a partition with a FAT32
file system. There has been problems (bugs) in Disks, but now I think it
can also restore a cloned USB boot drive to a standard storage drive.

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https://bugs.launchpad.net/bugs/1622313

Title:
  gparted does not recognize the iso9660 file system in cloned Ubuntu
  USB boot drives

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