Disks are just sectors.  I think that's true generally; if SIMH supported any 
systems with variable length disk blocks something else would be needed, but 
the only system I can think of that does so is the IBM 360.  (Actually, that 
one is much stranger, with its keyed sector feature.)

Note that sector sizes may be 512, as for RK05, or something else.  RC11 has 64 
byte sectors, RF11 is word addressable.  And IBM 1620 has 200 digit sectors if 
I remember right.

        paul


> On Sep 25, 2018, at 9:38 AM, Folkert van Heusden <m...@vanheusden.com> wrote:
> 
> Hi,
> 
> Quick question: what is the file format (on the host system) of a PDP-11 RK05 
> disk? Just disk-sectors as-they-are? Or do they have headers like the magtap 
> file format? ( http://simh.trailing-edge.com/docs/simh_magtape.pdf )
> 
> 
> regards
> 
> -- 
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