After a few tries at manually verifying partial writes and realizing that it's awfully tedious to do any exhaustive testing, I hastily threw together a shell script to help automate the process. Since there are others on this list doing similar things, I figured it might be helpful to throw it up here.

Note: It's unfinished and probably has bugs, but I figure it's at least a start, even if only to kickstart a conversation about how to test partial writes in a standard and useful manner.