[Bglug] Secure erase of an SSD different from HD

andrew at howlett.net andrew at howlett.net
Thu Dec 31 01:14:59 EST 2015

Thanks William. I think you mean the --security-erase and 
--security-erase-enhanced options.

I'm a little bit concerned with the DANGER warnings all over the hdparm 
man page, but will likely become complacent after using it for a while 


On 2015-12-31 00:08, William Park wrote:

> Starting point is
> hdparm -I /dev/sdX
> and check "Security" section at the bottom.
> In particular, check if it's "frozen" or "not frozen", because you have
> to unfreeze it before erasing. If it's frozen, then put the computer to
> sleep and wake it.
> Speed-wise, though, "hdparm" method is about the same as "dd" method.
> --
> William
> On Wed, Dec 30, 2015 at 11:39:31PM -0500, Rashkae wrote:
> On 15-12-30 10:56 PM, Andrew Howlett wrote: i paid $9 for the partition 
> magic iso mentioned in the article. partition magic is a linux distro, 
> fits on a 1G USB stick. For those who would rather use all kind of 
> arcane commands to do it themselves: (Note: risky commands, use at own 
> risk.) hdparm --security-set-pass NULL /dev/sd? hdparm --security-erase 
> NULL /dev/sd? hdparm --security-disable NULL /dev/sd? Some BIOSs will 
> pre-emptively disable the security features. (This prevents malware 
> from locking your drive with an unknown password, bricking it.) The 
> easiest way I found around this is to boot the Linux environment, then 
> hotplug the SDD you want to blank. New versions of linux-util suite 
> include a command to trim the entire device: The command is called 
> *blkdiscard*. This is a good to restore the performance of an SSD when 
> re-using the drive, and should effectively do the same thing. 
> *However.* The standard does not require the drive to return null bytes 
> from those sectors before they are re-used. I think most drives will do 
> so, but blkdiscard should probably not be used instead of a proper 
> secure-erase. _______________________________________________ Group 
> mailing list Group at bglug.ca 
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