http://bugs.winehq.org/show_bug.cgi?id=17618
--- Comment #12 from Ben Klein shacklein@gmail.com 2009-12-11 07:05:27 --- I believe these are two separate problems. The one indicated here was that setting "Local hard disk" in winecfg did not cause the matching registry entry to be inserted, so the next time you opened winecfg it reverted to "Autodetect". This problem was fixed when my patch was committed in ca. 1.1.22.
Bug 20974 seems to indicate that the API for reporting drive type back to applications is faulty. I didn't have any applications suitable for testing this behaviour.
It appears that 20974 is not actually a regession as was implied from reopening this bug. They are clearly very closely related and I have no objection to the Duplicate status.