The text-mode installer crashed trying to mount a DOS-formatted disk under
/mnt/dos. The error was 'path not found;' a second install attempt
succeeded after I specified /dos as the mount path in disk druid.
Appears to be a dupe of bug 17707.
Assigning to a developer to reproduce and evaluate.
This problem should be fixed by the updates disk available on the 7.0 errata.