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Old 01-21-2010, 03:49 AM   #1
kirukan
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Clean confidential data from harddisk


As i said in title, we need to erase all datas from harddisk before distroy our old servers.

Quote:
dd if=/dev/zero of=/dev/hda bs=1M
Quote:
shred -fzuv -n 100 /dev/hda
1. Which is the best practice to erase data, dd or shred?
2. How can i execute these commands in running server, do i need to re-boot the servers as RESCUE mode using bootable cd?
 
Old 01-21-2010, 04:16 AM   #2
theboogymaster
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Quote:
Originally Posted by kirukan View Post
As i said in title, we need to erase all datas from harddisk before distroy our old servers.

1. Which is the best practice to erase data, dd or shred?
I think the best one is shred cause it will write the Hard Disck a lot of times and the data can't be read anymore.

Quote:
Originally Posted by kirukan View Post
2. How can i execute these commands in running server, do i need to re-boot the servers as RESCUE mode using bootable cd?
Yes you need to mount the Hard Drive separatly.

Last edited by theboogymaster; 01-21-2010 at 04:17 AM.
 
Old 01-21-2010, 04:24 AM   #3
jschiwal
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Using a count of 100 is absurdly high. After 2 writes of random data, I doubt anyone will be able to read them.
I would recommend using DBAN to securely erase the disk drives.

Even better is to use a tool that uses a function in the drives themselves to do the same.
You could also take a drill and drill through the drives. Many modern drives have ceramic platters so a large hammer would word to smash the platters to bits.
 
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Old 01-21-2010, 07:12 AM   #4
kirukan
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1. Can i do this task in RESCUE mode by booting bootable CD?
OR
2. Can i do this in single user mode?
we don't reuse this hardware, just only need to erase the data
 
Old 01-21-2010, 07:24 AM   #5
linus72
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you can use a livecd
do you have one?

there are many apps for this, dd, dban, secure-delete wipe

I have most stuff like that on 503box-Chrome
http://linux.softpedia.com/get/Syste...86-53783.shtml

however, there are many linux livecd's for this
SystemRescueCD
DVL damn vulnerable linux

of course none of them have my eye-candy

google for the specific apps like dban, etc
 
Old 01-21-2010, 08:19 AM   #6
H_TeXMeX_H
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If you have a sledgehammer lying around and some safety goggles that will work fine too and it'll take less time. Thermite is also an option, as are large magnets.
 
Old 01-21-2010, 08:23 AM   #7
kirukan
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Can i use Knoppix for live CD?
 
Old 01-21-2010, 10:18 AM   #8
jschiwal
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Knoppix should be fine. As long as it's kernel has kernel modules for your disk controllers.
 
Old 01-21-2010, 01:14 PM   #9
Quads
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I don't know if you need the hard drives anymore, but if not when you get done erasing just drill holes through them.
 
Old 01-21-2010, 09:49 PM   #10
kirukan
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SunOS 5.8
#df -k ouput
Quote:
/dev/md/dsk/d10 /
/dev/md/dsk/d60 /in
/dev/md/dsk/d50 /indelivery
etc....
Quote:
#format
0. c1t0d0
1. c1t1d0
2. c1t2do
etc...
how can i identify which partition represent /in, /indelivary becasue its confusing me the two ouputs
 
  


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