As a matter of coincidence, I migrated to Linux on my work notebook something like 2..2,5 months ago.
...and used Unetbootin to create a bootable flash drive for installation.
While installing Linux I realized we would desperately need such a tool on eCS, so I created a support ticket (0002754) for this.
This would also be especially useful for testing all the beta and RC versions of eCS that might (and will) come out in the near future.
So take it as "already requested"
