Why Can’t I Format My HDD Partition as CDFS?
Thanks to optical disc imaging software such as PowerISO or the free ISODisk applications, there is no need to format your hard disk partition as CDFS, as the ISO 9660 file format can be saved without this.
You might opt to create a hard disk drive partition for ISO files, however; if you have several of these then keeping them together to be burnt to disc or mounted as and when required might be a good idea.
CDFS can be applied to other storage media, however, most notably certain USB flash sticks or “thumb drives". These disks can then be used as virtual CD ROM drives without having to resort to complicated conversion tools to mount a disc image on them.
USB flash drives of this type have two sections, a boot block where the CD image’s “autorun.inf" file is stored, and then a larger partition in CDFS format where the main CD contents are kept. These drives are available from U3, although their hardware is usually repackaged or incorporated into the drives of bigger names, such as Toshiba. When inserted, a U3 device will display on Windows as a read-only CD-ROM disc as well as a standard flash drive.