External disk not recognized after lateset mavericks update

Just updated my MacBook pro Retina to 10.9.5
since then, my external hd WD My passport Ultra does not mount on the finder. It is visible in Disk Utilty, but is greyed.
ANy suggestions?
Thanks

the WD ext disk has just appeared on desktop and did the usual back-up process...
Yesterday I checked it several times and disk utility even told me that the ext disk should be repaired, which it failed to do...
now it is working again. (must have just needed a good night's sleep...)
Should I still be worried? Any comments, please?

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Dear,
Yesterday i bought my first macbook pro. Before i bought that macbook i saved all my data from my windows laptop on my external USB HDD.
Today i connected the external hdd trough USB. the macbook recognized it immediatly but i accidentally removed the usb cable from the disk, so it dissappered.
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Welcome to Mac-land.
This wouldn't happen to be a WD external drive, would it?
Is there some utility on your Windows laptop that you can use to repair the external drive? Something equivalent to Disk Utility on a Mac? I'm not a Windows guy so I don't know.
If the data is still on your Windows laptop, then maybe your Windows machine can erase the drive enough for you to get it to mount on your Mac.
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"Try Disk Utility
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http://docs.info.apple.com/article.html?artnum=106214
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Some people get away without Repairing Permissions for years, some for only days.
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If many Permission are repaired, or any Directory errors are found, you may need to re-apply some the latest/biggest updates.
May even need to do an Archive and Install if you have room on the HD...
http://docs.info.apple.com/article.html?artnum=107120
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http://www.apple.com/support/downloads/
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http://www.apple.com/support/downloads/macosx10411comboupdateintel.html
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here is the screen shot

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External disk not recognized after lateset mavericks update

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