WD MyBook won't mount after 10.7.4 installation

I have a Western Digital MyBook 1 TB external USB drive that has worked fine for years. I used it a day and a half ago under 10.7.3 with absolutely no problems. I then upgraded to 10.7.4, and now the drive won't mount. It spins up for a second or two, then powers off. Console shows the following:
5/17/12 11:31:55.000 AM kernel: USBF:
4544.789
[0xffffff800aa42400] The IOUSBFamily is having trouble enumerating a USB device that has been plugged in.  It will keep retrying.  (Port 1 of Hub at 0x4000000)
5/17/12 11:31:58.000 AM kernel: USBF:
4547.797
[0xffffff800aa42400] The IOUSBFamily was not able to enumerate a device.
Do I have a borked installation of 10.7.4? Would a simple re-install fix the problem? It seems highly unlikely to me that the drive just happened to silently die in the interim between its last use and the 10.7.4 install... What's going on?

I tried repairing disk permissions, but no dice. I still get these errors in the console:
5/18/12 12:05:42.000 PM kernel: USBF:
169.760
[0xffffff800aa93600] The IOUSBFamily is having trouble enumerating a USB device that has been plugged in.  It will keep retrying.  (Port 2 of Hub at 0x6000000)
5/18/12 12:05:45.000 PM kernel: USBF:
172.774
[0xffffff800aa93600] The IOUSBFamily was not able to enumerate a device.
I also tried reinstalling 10.7.4 using a different method: the first time around, I copied the InstallESD.dmg file to a hard drive partition and installed from there. The second time, I just ran the installer app from the main HD and let it do its thing. The second method seemed to take longer; I wonder if it was going through the files to see which ones needed to be updated or not. Still no positive result.
I really wish Apple hadn't removed the Archive & Install feature. I really liked that.  : /
As for the combo updater, I can't use the combo updater because my installer is the 10.7.4 installer from the App Store. I don't have access to an earlier version, unless there's some way to get Apple to let me download a previous version from the App Store. (I would think that having a pull-down menu on the page for Lion to select which version to download would be a no-brainer, but I guess not. I just submitted a feature request on the feedback page for OS X, but beyond that, I don't know what else I can do...)

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