External WD HD stopped working properly after routine software update

Hello
I have WD my studio external HD connected to my iMac 24" early 2009 with OS 10.6.8. This morning everything was working fine, but then I updated the software after I was prompted. I had not updated the software since last july.
After the update, I got a message saying that the external HD could not be repaired. Very strange, as it was working perfectly before the update. I tried to restart the computer, but i got the same message.
I tried the few usual things (unmounting, disconnetting, repairing with disk utility etc,) with no success. Everything behaves funny, in the sense that sometimes the HD does not mount, sometimes it mounts, but it has a different icon (I used it to back up with time machine), sometimes it is greyish in the list of HD in finder, and I can't change permissions on it (i have write and read permissions, but they're greyish and there's nothing i can do).
Any suggestions?
thanks

I tested it on another computer and it works perfectly.
On my regular computer, when I start it, i get this message "Mac OS can't repair the disk "My Book". You can still open or copy files on the disk, but you can't save changes to the files on the disk. Back up the disk and reformat if as soon as you can".
As I said earlier, the problem occurred after I updated the software (the software updates that Mac OS always suggests). I worked perfectly before the update, and I got the error message when the Imac restarted after the update.
Suggestions?

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