This came up on several mailing lists a while back. The conclusion was that yes, it is possible, but no, it is not practical. There would have to be a lot of error-correction built in, because DV tape is prone to dropouts or minor errors after repeated use (in most cases not noticible with lossy-compressed video, but it could destroy data). Also, it would be slow, and more expensive media-wise than using a dedicated data tape drive.