Ubuntu ISOs To Finally Double As USB Images
Written by Michael Larabel in Ubuntu on 15 June 2011 at 09:34 PM EDT. 12 Comments
UBUNTU --
A small but useful feature for the CD ISOs of Fedora, openSUSE, MeeGo, and many other Linux distributions is that they are spun as hybrid ISOs. Hybrid ISOs allow the same CD ISO to be copied directly to a USB storage device (i.e. flash drive) without needing to rely upon any external utilities. Ubuntu ISOs have not supported this feature, but they do have their easy-to-use start-up disk creator to take care of this task. However, the daily ISOs for the Ubuntu Oneiric development cycle and all official Ubuntu CD releases going forward for i386 and x86_64 platforms will be now spun as hybrid ISOs.

Now for those wishing to transfer an Ubuntu ISO to a USB drive don't need to depend upon Ubuntu's USB creator or any third-party program, but can directly copy the ISO contents to a USB device (e.g. by using the dd command). The Ubuntu USB creator can still be useful though for enabling persistent storage support. This hybrid ISO support is supported both for the desktop LiveCD as well as the alternate/server installs, but only for i386 and x86_64 architectures.

Ubuntu and Debian were late in supporting this hybrid ISO functionality as they couldn't use the isohybrid utility as that would break Jigdo downloads, so they ended up switching to the xorriso utility for CD image generation. Debian addressed these hybrid ISO issues and xorriso improvements back in January.

The hybrid ISO change was mentioned today on the ubuntu-devel mailing list.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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