wrong signature?

Not to re-install Windows, I abandoned data in D and E drive of Windows. Using install CD of Fedora Core1, I install FC1 and now from Mozilla on FC1.
While installing Linux, I got error messages from installer, as " Invalid partition table on /tmp/hda - wrong signature 0 " What happened?
I suspect installer of Mandrake9.2, which might rewrite something at BIOS level. It must be. I type "df" at console then I got /dev/hda1, /dev/hda5. This is typical on Mandrake9.2
Now I will check if I can boot Win2k or not. From KNOPPIX I could not see fat32 partitions except hda1, by the way.