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AIX
How to use dd command to erase the data in disk
Post 302475152 by Corona688 on Friday 26th of November 2010 05:47:37 PM
11-26-2010
Shredding perfectly good disks is a waste of hardware and probably a warranty violation. 
I vaguely remember a warranty disagreement between Dell and the US military... They could hardly return the machines intact after they'd used them. They came to a rather Pyrrhic compromise: Dell got the drives back, but didn't get their platters!
It of course depends on your security standards but a simple dd if=/dev/zero of=/dev/disk will wreck the data badly enough that you'd need to hire cleanroom spacesuit people and their special machine to have any hope of retrieving it. With 7 overwrites, not even that.
The shred utility I mentioned earlier does that kind of destructive overwrite at the file level, on filesystems that support it, letting you securely delete a file without needing to reformat. Of course that's no guarantee there's nothing unwanted in unlinked sectors somewhere.
I vaguely remember a warranty disagreement between Dell and the US military... They could hardly return the machines intact after they'd used them. They came to a rather Pyrrhic compromise: Dell got the drives back, but didn't get their platters!It of course depends on your security standards but a simple dd if=/dev/zero of=/dev/disk will wreck the data badly enough that you'd need to hire cleanroom spacesuit people and their special machine to have any hope of retrieving it. With 7 overwrites, not even that.
The shred utility I mentioned earlier does that kind of destructive overwrite at the file level, on filesystems that support it, letting you securely delete a file without needing to reformat. Of course that's no guarantee there's nothing unwanted in unlinked sectors somewhere.
Last edited by Corona688; 11-27-2010 at 02:09 AM.. Reason: /dev/zero, not /dev/null
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LEARN ABOUT NETBSD
mfi
MFI(4) BSD Kernel Interfaces Manual MFI(4) NAME
mfi -- LSI Logic & Dell MegaRAID SAS RAID controller SYNOPSIS
mfi* at pci? dev ? function ? DESCRIPTION
The mfi driver provides support for the MegaRAID SAS family of RAID controllers, including: - Dell PERC 5/e, PERC 5/i, PERC 6/e, PERC 6/i - Intel RAID Controller SRCSAS18E, SRCSAS144E - LSI Logic MegaRAID SAS 8208ELP, MegaRAID SAS 8208XLP, MegaRAID SAS 8300XLP, MegaRAID SAS 8308ELP, MegaRAID SAS 8344ELP, MegaRAID SAS 8408E, MegaRAID SAS 8480E, MegaRAID SAS 8708ELP, MegaRAID SAS 8888ELP, MegaRAID SAS 8880EM2, MegaRAID SAS 9260-8i - IBM ServeRAID M1015, ServeRAID M5014 These controllers support RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 50 and RAID 60 using either SAS or SATA II drives. Although the controllers are actual RAID controllers, the driver makes them look just like SCSI controllers. All RAID configuration is done through the controllers' BIOSes. mfi supports monitoring of the logical disks in the controller through the bioctl(8) and envstat(8) commands. EVENTS
The mfi driver is able to send events to powerd(8) if a logical drive in the controller is not online. The state-changed event will be sent to the /etc/powerd/scripts/sensor_drive script when such condition happens. SEE ALSO
intro(4), pci(4), scsi(4), sd(4), bioctl(8), envstat(8), powerd(8) HISTORY
The mfi driver first appeared in NetBSD 4.0. BSD
March 22, 2012 BSD