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bug#15633: dd and host protected area
From: |
Peter D. |
Subject: |
bug#15633: dd and host protected area |
Date: |
Wed, 16 Oct 2013 18:19:54 +1100 |
Hi,
Is it deliberate that dd can not read from, or write to the host protected
area? Or is it a bug?
It is sensible the the OS does not normally access the HPA, but dd is not
a normal tool.
Personally I would expect it to be able to read from the HPA and to write
to it with a suitable flag like, "--yes-I-am-reckless".
Some jurisdictions require that hard drives be blanked before disposal. Dd
is the obvious tool for that.
I have two 80GB drives in this machine one with HPA, the other without.
Hear is a cut'n'paste from my console...
address@hidden:~$
address@hidden:~$
address@hidden:~$
address@hidden:~$ sudo hdparm -N /dev/sdb
/dev/sdb:
max sectors = 156299375/156301488, HPA is enabled
address@hidden:~$ sudo dd count=1 if=/dev/sdb of=junk
skip=156299376
dd: `/dev/sdb': cannot skip: Invalid argument
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.000515987 s, 0.0 kB/s
address@hidden:~$ sudo dd count=1 if=/dev/sdb of=junk
skip=156299375
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.000105041 s, 0.0 kB/s
address@hidden:~$ sudo hdparm -N /dev/sda
/dev/sda:
max sectors = 156301488/156301488, HPA is disabled
address@hidden:~$ sudo dd count=1 if=/dev/sda of=junk
skip=156299376
1+0 records in
1+0 records out
512 bytes (512 B) copied, 0.0182093 s, 28.1 kB/s
address@hidden:~$
address@hidden:~$ dd --version
dd (coreutils) 8.13
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Paul Rubin, David MacKenzie and Stuart Kemp.
address@hidden:~$
Thank you.
--
Peter D.
Sig goes here...
- bug#15633: dd and host protected area,
Peter D. <=