Hmmm.... sector still had random data after rm tmpfile and sync;From: Steve Clark <sclark@netwolves.com>Unfortunately when I try it on SL 6.0 hdparm gets a segmentviolation on the --read-sector command. The fedora one is 9.36 And the one we used on CentOS 5.6 was 9.37 (compiled it). Maybe try a more recent version...