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http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.1_Technical_Notes/anaconda.html Anaconda incorrectly failed with a traceback when an attempt to unpack a driver disk to a pre-existing root partition. (BZ#640260) Anaconda incorrectly failed with a traceback when an attempt to unpack a driver disk to a pre-existing root partition did not succeed. (BZ#640260)
Fixed: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.1_Technical_Notes/anaconda.html#RHBA-2011-0530 Thanks for reporting, Martin