Using ontape to disk when archive is >2GB

In one of the discussions recently someone mentioned there was an issue with setting TAPEDEV to greater than 2000000 (to allow for the backup of a greater than 2GB archive) and for that reason they needed to use a public domain utility called "expect" to return confirmation when ontape prompts for a new tape. Is this just an issue when archiving to disk or is it the case with TAPEDEV in general. I have mentioned this to Informix who seem to think TAPEDEV >2gb is okay but also came up with the standard line on not supporting ontape to disk. I believe Art mentioned last week something to quote to Informix support to say that it is supported. Unfortunately I didn't have that information to hand so if anyone can supply this as well I'd be most grateful Paul Matthews