The RX02 has afair 77 tracks, 26 sectors at 256 bytes
giving 512512 bytes.
In RSX11M sources at some places an RX03 is mentioned at double RX02
capacity. This was never sold by DEC. But an 1 Mb 8" floppy is very much
possible.
Also, remember that a 720K 3.5" drive (and, consequently,
a DSQD 5.25" drive) is 1MB unformatted. How much you can
actually get from the drive depends on the format you use.
--
Roger Ivie
rivie(a)teraglobal.com
Not speaking for TeraGlobal Communications Corporation