External Drive No Longer Accessible after 10.9.5 Update

After upgrading to 10.9.5 from 10.9.4, I have lost access to my external drive (USB connected) used by Time Machine.  The icon on the desktop is amber. Disk Utility can not repair it. I get "Error Some information was unavailable during an internal lookup."  Also.. "Problems were encountered during repair of the partition map." The disk format is Mac OS Extended (Journaled). If I launch Windows 7 (using Fusion 6) on the iMac, it recognizes the drive (I have the HFS+ driver installed.) I can read and write to the drive and see all the time machine backups on the Win 7 virtual machine. I am logged in to my iMac as a Standard User.  Logging in as the Administrator has no effect. The drive can not be repaired or formatted. This is a late 2009 iMac with 12GB ram. Original OS was Snow Leopard. It was upgraded from 10.6.8 to the full Mavericks OS.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

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