On Nov 29, 2015, at 12:13 PM, Warner Losh <i...@bsdimp.com> wrote: > A similar thing was implemented on the old DEC Rainbow 100 (though > I'm sure others). To give the software a chance to do some minor things > while processing, it physically laid out the 10 sectors as 0 2 3 4 6 8 1 3 5 > 7 9 > so that when reading sequentially, you had half a disk rotation to get your > act > together to read the next sector. This turned out to be only a small > performance win, and was a pita for interoperability,
….but, at least you had a functionally redundant sector 3! :-)
