Can't find my external USB hard drive

Just downloads OS X Yosemite, and now I can't get my usb external hard drive to show up when i plug it in, can't find it anywhere in finder. anyone know how to fix it?

Right, managed to get my WD Ultra passport working (the external hard drive I'm using) basically if you have a external hard drive in which you need to enter a password, you will have to enter the password before you can access it, the is irrelevant to whether or not you set the settings to automatically unlock the drive when you plug it in which is what i did but i have to now enter my password in every time. also it may take a few tries to get into it, think the new software is a bit glitchy towards the different ports on the mac i.e. usb and stuff. If you don't need a password just keep plugging it again and again, thats what i did to get rid of a error message saying the drive was unreadable.will let you know if i know any other ways to make it work, i didn't try the test disk thing either thought id just try unplugging it again then if that didn't work i'd try it.
hope this helps.
good luck.

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