>So if the drive is 5400 rpm, 227 is much more than 5400/60=90 and even if >it's 7200 (manufacturers sometimes upgrade drives inside portable hd >without >prior notice), it's still twice as much as 7200/60=120.
5400/60, 7200/60 ... those values rely on the assumption that successive LBAs are mapped to successive physical sectors (512 or 4K, whatever) on the same face of the same plater. Is it obvious that all today's typical stock drives actually implement only that simple old scheme and not an untold mix of various interleaving techniques? Yet that wouldn't explain a two- or threefold difference between internal SATA and USB. That sounds surprising. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
