Incessant bad block requests

Addition: today I had to reboot and accidentally ran the new kernel. This time it seemed to boot up okay. But after a while I noticed the external USB drives didn't appear and they weren't around as dev/sdX either.
I turned them off and on. They still wouldn't come on, and one of them was making a scratchy sound. When I checked out dmesg, I saw that the "Bad block number requested" messages kept spewing there, but now for one of those drives!

...
[ 7599.985688] sd 9:0:0:0: [sdd] Bad block number requested
[ 7599.986058] sd 9:0:0:0: [sdd] Bad block number requested
[ 7599.986190] sd 9:0:0:0: [sdd] Bad block number requested
...

etc..

I think this might be relevant...

Thank you for taking the time to report this bug and helping to make Ubuntu better. Now that the 7.10 Gutsy Gibbon release of Ubuntu is out, we were wondering if you can still reproduce this issue. Could you please download and try the new version of Ubuntu from http://www.ubuntu.com/getubuntu/download and report back your results. If the issue is still present in the new release, please attach the following information:
* uname -a > uname-a.log
* cat /proc/version_signature > version.log
* dmesg > dmesg.log
* sudo lspci -vvnn > lspci-vvnn.log
Please be sure to attach each file as a separate attachment. For more information regarding the kernel team bug policy, please refer to https://wiki.ubuntu.com/KernelTeamBugPolicies . Thanks again and we appreciate your help and feedback.

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This one is not fun. It just keeps going like that too.

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Please close this bug. I decided to do a fresh install from the 7.10 CD and everything works now.
Thank you for the attention.

This bug report is being closed due to your last comment regarding this being fixed with a reinstall. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the drop down box. You can learn more about bug statuses at http://wiki.ubuntu.com/Bugs/Status . Thank you again for taking the time to report this bug and helping to make Ubuntu better. Feel free to submit any future bugs you may find.