Vista - Event ID 57 on nonexistant volumes

I'm getting a strange error, and figured that it'd fit into Administration.

Every five seconds, I'm getting two errors, 46,554 total (Event ID 57's).
Event ID 57. The error is "The system failed to flush data to the
transaction log. Corruption may occur." Under details, it gives me the HDD
volume that the error is on. This is where it becomes especially strange.
This is a laptop and I use two HDD's. One internal, one external on USB.
The internal is two partitions, the external has one.
But, under details, I'm getting this error on volumes 3-6. Currently, it's
5 and 6.

Anyone have any ideas?