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Dude read the release notes:
"mportant Warnings about the Test Release
* The 2.6.21 kernel uses new IDE drivers which use the same
'libata' subsystem as the SATA drivers. As a side-effect, IDE
devices previously named /dev/hdX will now be named /dev/sdX.
This may cause problems with anything that mentions devices by
name instead of by filesystem label. Anaconda should be able to
detect most of these problems and help you fix them. "