Can you give some more details? How are you running cfdisk, from the installer, or from an existing system, or inside a virtual machine??
Also, a lot of problems with the *fdisk family arise from the default device *fdisk attempts to partition:
When your CD-ROM is ATA and your HD is SATA, then the kernel calls your CD-ROM /dev/hda and your HD /dev/sda. When you run cfdisk without arguments it will default to /dev/hda and hence attempt to partition your CD-ROM. Which fails, because CD-ROMs are read only
Running `cfdisk /dev/sda` would do the trick (if this was indeed the problem).
Running these commands will tell you more about what is what:
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Can't tell an OS by it's GUI
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