Comment 28 for bug 8978

This error is not isolated to installs on hard drives with Windows installed, nor does it have anything to do with the drive being an external drive. I received Error 21 on an empty disk installed in my computer. It failed on an Asus P5B systemboard running a Core2 Duo E-6600 processor. I also attempted to install Ubuntu on another clone Asus P5LD2-Deluxe and I couldn't even boot to the cd. Ubuntu installed fine on my Dell GX110 that is 8 years old.