Help!  External drive won't connect after Yosemite 10.10.2 update

I ran the Yosemite 10.10.2 update on my 2013 MacBook Air today, and now I cannot connect to my external Western Digital hard drive.  At times, the drive won't connect or show up at all, but at other times, I get a warning that the computer cannot read or repair it.  Help!  It worked this morning and all of my photos are on there.  I know other people have had similar issues, but I haven't found anything resembling a solution.  (And yes, I have restarted everything, tried different cords, etc.)  Does anyone have any suggestions?
Thank you!

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 in OS X 10.9 or earlier, 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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