Can anyone tell me if the issue with Mavericks destroying external hard drives has been fixed? I have upgraded my old iMac, and Mavericks is running well on that but I haven't tried backing it up with Time Machine because of that issue, and I haven't yet upgraded Macbook Air because of this. I'd like to upgrade the Air. I'm not concerned about other bugs in first version of Mavericks, just this hard drive issue. Forgot to mention what my external drives are: For Imac, a Maxtor. For media for both, Toshiba. For the Air, small size Seagate FreeAgent Goflex partitioned with CC and Time Machine, and a larger Seagate Goflex drive with just Time Machine.