13 Dec
2022
13 Dec
'22
3:41 a.m.
On Mon, Dec 12, 2022, 8:32 PM Rudi Blom <rudi.j.blom(a)gmail.com> wrote:
I vaguely remember having read here about 'clever code' which took into
account the time a magnetic drum needed to rotate in order to optimise
access.
Yes. Many ways this was done. Biggest ones were interleaving and striding.
Interleaving allowed one a little processing time for each sector while the
disk fpu. So the next logical sector isn't the next physical... and the
sectors are numbered in adjacent tracks to take into account rotation and
seek times.... there is a lot of research here...
Warner
Similarly I can imagine that with resource restraints you sometimes need to
be clever in order to get your program to fit. Of
course, any such
cleverness needs extra documentation.
I only ever programmed in user space but even then without lots of comment
in my code I may already start wondering what I did after only a few months
past.
Cheers,
uncle rubl
--
The more I learn the better I understand I know nothing.