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Old 03-18-2009, 03:19 AM   #1
your_shadow03
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How to format Linux Box in single command?


I want to submit the rental machines back to Vendor.
So I need to format in no time to 8 machines.
RHEL AS 4 Update 6 is installed on those Boxes.
How can I format them in single shot?
 
Old 03-18-2009, 03:25 AM   #2
your_shadow03
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I heard about shred command but how to use it for completely cleaning the hard disk.
I dont want vendor to recover the essential corporate data.
 
Old 03-18-2009, 04:18 AM   #3
arckane
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Grab UltimateBootCD and then use the Hard Disk tools. Plenty on there including one that'll do a DOD level wipe.
 
Old 03-18-2009, 04:26 AM   #4
syg00
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Quote:
Originally Posted by your_shadow03 View Post
So I need to format in no time to 8 machines.
Ain't gunna happen - will take (quite) a while.
 
Old 03-18-2009, 04:38 AM   #5
your_shadow03
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No issue regarding the time factor..But Server should be completely wipe out.
.Why shred not recommended?
 
Old 03-18-2009, 08:05 AM   #6
farslayer
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I use dban to wipe machines.. depending on the drive size it's not a quick process though.

http://www.dban.org/
 
Old 03-18-2009, 08:15 AM   #7
pixellany
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"shred" operates on files (and--I assume--complete directories) "man shred" for details.

For secure erasing of a disk, you need to wipe everything---not just specific files. If you don't want to use something like DBAN, then you can do it manually with dd**. Regardless of the method, it takes time.....

**"Secure wiping" is nothing more than multiple passes using combination of random data, zeros, etc. I'm no expert, but it's hard to imagine anyone easily recovering data after 2 passes: random, then all zeros.
 
Old 03-18-2009, 08:50 AM   #8
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shred can also do disks or partitions, just do
Code:
shred /dev/sda
It's very slow though! But presumably so is any other method.
 
Old 03-18-2009, 08:58 AM   #9
pixellany
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OK---so I should follow my own advice and actually read the man page? Nah, it's easier to just type a dd command.........
 
Old 03-18-2009, 11:45 AM   #10
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Quote:
Originally Posted by pixellany View Post
I'm no expert
Yes you are.
 
Old 03-18-2009, 11:48 AM   #11
SlowCoder
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Software like DBAN wipes your drive(s) at the bit level. Not just files or directories. It wipes out EVERYTHING. Boot sector. FAT. Etc. If there is a faster way to kill all the bits on your drives, please let us know. Start it on your computers and let it run overnight.
 
Old 03-18-2009, 11:56 PM   #12
your_shadow03
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I appreciate all comments.
LAstly I thing I should try using DBAN.
Just for the knowledge what is the complete to wipe hard disk through dd.
 
Old 03-19-2009, 04:11 AM   #13
openSauce
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Quote:
Originally Posted by your_shadow03 View Post
Just for the knowledge what is the complete to wipe hard disk through dd.
Code:
dd if=/dev/zero of=[device]
Where device can be /dev/sda, /dev/hda, etc. If you think overwriting with random data is more secure than zeroing, you can do

Code:
dd if=/dev/urandom of=[device]
You might be able to speed it up by adding the parameter bs=1G (read/write 1GiB blocks at a time), I'm not sure. The command shred [device] effectively does many of the above random overwrites, followed optionally by an overwrite with zeroes. This may be overkill though from what I've heard elsewhere.

Don't really see the need for DBAN et al when dd is so simple and comes with every linux distro, but maybe the others have some advantages I don't know about.

Last edited by openSauce; 03-19-2009 at 04:13 AM.
 
Old 03-19-2009, 07:28 AM   #14
your_shadow03
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You mean I need to start wiping out with:
Code:
dd if=/dev/zero of=[device]
First of=/dev/hda5
then of=/dev/hda4
then of=/dev/hda3
and so on..
 
Old 03-19-2009, 08:57 AM   #15
openSauce
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That would wipe the partitions individually if you want to do that (not the MBR or partition table though), or you can just do the entire drive with of=/dev/hda (no numerical suffix).
 
  


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