4 January 2012
When booting a regular Linux system, it just mounts some partition with a nice file system (such as ext4) on your HDD on / read/write and there you go.
When booting from a CD-ROM, it’s not that simple. The CD-ROM file system, ISO 9660, does not support the file names and attributes that a Linux system normally needs. And the CD-ROM is read only.
There are ways to work around these issues.