http://www.mm2d.net/linux-workstation/linux-hdd-clear.shtml http://www.hitachi.co.jp/New/cnews/2002/0124/index.html NSA標準、進捗表示 # time shred -n 2 -z -v /dev/hda iostat Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz awa…