Bill Pasternak wrote:

At low speed a C-120 (2 hr) cassette will store 4 hours of voice quality
sound. Another reason that the cassette is so popular with the RSS.

But this capacity pales in comparison to digital devices. I was amazed
to discover that some of those little hand-held digital recorders store
144 hours of "extra high-quality" sound. That technology sure has
changed since I last looked at it.

73, Steve KB9X