On Wed, Sep 2, 2009 at 5:32 PM, Dean S. Messing <[email protected]> wrote:
> I have a terebyte sata drive that I need to securely wipe clean. It > originally had 2 partitions. I deleted them using `fdisk', rebooted, > and then as root ran > > shred -vz /dev/sdd > > The drive is capable of about 60MB/sec, but shred is only "shredding" > about 25MB every 5 seconds according to its output. Since the default > number of passes is 25, this works out to about 5 days. > > The `shred' process is running at 100% CPU, presumably computing > the special random patterns for erasure. Since I have 4 CPUs > would creating 4 unformatted partions on the drive and then running > something like: > > shred -vz /dev/sdd1 > shred -vz /dev/sdd2 > shred -vz /dev/sdd3 > shred -vz /dev/sdd4 > > in parallel cut my time? Would be just as secure? > > Thanks > Dean > Since when is formatting a CPU-intensive task?. Think about this... the heads ALL move in parallel on the same platter. There aren´t 4 individual head actuator arms moving heads independently. If the ´arm´ goes to track 255, all heads go to track 255... Here, news for you: http://www.dansdata.com/images/io012/heads1280.jpg FC PS: this is also interesting reading.... Dual actuator HDs.... http://www.tomshardware.com/news/seagate-hdd-harddrive,8279.html
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