3b2 software distribution format standards

[Keith Rich]

Can anyone help me to understand what standards exist with respect
to 3b2 software distribution.  In particular, I'd like to know
about tape formats.  If I create a QIC-24 format cartridge tape
containing cpio data, what percentage of 3b2 sites could read it?
If this is not suitable, what is?

Thanks for any help you can give me,
	Keith Rich - keith at imagen.com