[Info-vax] disk sizes

[Phillip Helbig---undress to reply]

In article
<baecaeaf-14aa-4510-9667-a2863c3c54db at u17g2000yqe.googlegroups.com>,
Hans Vlems <hvlems at freenet.de> writes: 

> > I just want to understand it.  :-|
> 
> One reason for this is the way disks are sectored. On older disks, say
> an RA82, the inner tracks have the same number of sectors (or blocks,
> whatever) as the outer tracks. So bit density is a lot higher on the
> inside tracks.
> So outer tracks go more sectors. At that point there is no direct
> relationship any moer between the tracks and the sectors on a platter.
> It may, perhaps, explain the increase in disksize.

That might be the (historical) origin of the jump from 8.6 to 9.1.

With modern disks, all or part of the sectors, tracks etc might be 
virtual anyway.