Add NTFS Data Partition to Startup Disk Creator USB Install

When creating a Live USB using Startup Disk Creator, the program creates an apparent ISO9669 read only partition that spans the entire drive.
This was not too bad back in the days of 2 or 4 GB flash drives. It is a total waste with 16GB and larger drives.

How can I convert this dead space to a useful NTFS partition that can be used for Data storage by both Linux and Windows?

Here is Solutions:

We have many solutions to this problem, But we recommend you to use the first solution because it is tested & true solution that will 100% work for you.

Solution 1

Creating a NTFS Data Partition on a Startup Disk Creator, balenaEtcher or Similar ISO9660 USB

Since 19.10 the process of cloning an OS to USB as done by Startup Disk Creator, creates a casper-rw partition.

This partition can be used for persistence by pressing shift at boot and esc, then F6 and esc again. then typing a space and the word “persistent”.

This must be done every boot where persistence in wanted.

It is possible to modify the ISO file used by SDC to include the word persistence into grub, but it is not easy.

If the Ubuntu install is mainly needed for installing Ubuntu, the casper-rw partition can easily be converted to a NTFS partition, that can be used for Data storage by both Linux and Windows.


  • Run Startup Disk Creator or Etcher to create Live 19.10, (or later), USB
  • Boot new Live USB to activate casper-rw partition, then Power Off.
  • Reboot the Live USB toram. (press shift when booting, hit F6 and type a space and toram).
  • Unmount casper-rw partition using Disks.
  • Open Terminal and run:

    sudo mkfs.ntfs -f -L data /dev/sdx3

were x is the drive number of the new Live USB

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The drive should now have the original data space minus the size of the OS ISO.

Note: Use and implement solution 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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