11Jan2008 (UTC +8) Just thought I'd share a little tech tip with you, before I go out for my delayed dinner, as I frequently experience the boredom of scrubbing HDDs. Here's something that can cut down the time in half, as compared to using dcfldd or dd.
Tried it on my 128MB USB flash drive, and I haven't listed all the disadvantages / advantages of one tool over the other yet, except that "badblocks" command is faster, & also checks the health of the HDD for re-use. Please feel free to contribute. [EMAIL PROTECTED] ~]# time badblocks -c 512 -s -w -t random -v /dev/sdd Checking for bad blocks in read-write mode >From block 0 to 128000 Testing with random pattern: done Reading and comparing: done Pass completed, 0 bad blocks found. real 0m31.177s user 0m0.434s sys 0m0.032s [EMAIL PROTECTED] ~]# time dcfldd if=/dev/urandom bs=512 of=/dev/sdd 256000 blocks (125Mb) written.dcfldd:: No space left on device real 1m7.754s user 0m0.128s sys 0m25.701s [EMAIL PROTECTED] ~]# time dd if=/dev/urandom bs=512 of=/dev/sdd dd: writing `/dev/sdd': No space left on device 256001+0 records in 256000+0 records out 131072000 bytes (131 MB) copied, 67.507 s, 1.9 MB/s real 1m7.519s user 0m0.131s sys 0m25.428s Drexx Laggui -- CISA, CISSP, CFE Associate, CCSI, CSA http://www.laggui.com ( Singapore / Manila / California ) Computer forensics; Penetration testing; QMS & ISMS developers; K-Transfer PGP fingerprint = 6E62 A089 E3EA 1B93 BFB4 8363 FFEC 3976 FF31 8A4E _________________________________________________ Philippine Linux Users' Group (PLUG) Mailing List [email protected] (#PLUG @ irc.free.net.ph) Read the Guidelines: http://linux.org.ph/lists Searchable Archives: http://archives.free.net.ph
