jaclaz, on 09 August 2011 - 06:23 AM, said:
To me in this context of bullding volumes that can be either a volume on Hard disk or represent a "superfloppy", a Head or a Track are exactly the same thing, for which two different names are used, one for floppies and one for Hard Disks.
While I don't disagree with you, after some musing, I think you are insisting in using the most misleading label possible, for an otherwise simple thing.
So let me make some considerations on what CHS is:
is the set of all tracks that are at the same distance from the center. Once you define a value for "Cylinder", the position of the whole head-manifold (which moves all heads solidarily) is fixed. So Cylinder means "distance from the center".
is which of the heads is the head-manifold that is activated. In general, that means just which side of which plater will be used, and in this general sense, head means "side". However, after fixing the cylinder, defining a head defines one side of one platter, and as such, it does define which track inside the cylinder is used. But this is true solely when the cylinder has already been fixed
. And that's why "sectors per track" is unmistakeable and graphic, while "sectors per head" requires contextualizing.
indicates which part of the track selected by the other two coordinates is to be addressed.
Moreover, there's no reason at all for different uses for floppies and hard-disks, unless you go all the way back to single sided floppies, for which cylinder = track and head is irrelevant, because there can be only one (as Connor McCloud used to say