Disk imaging program?

John Hupp ubuntu at prpcompany.com
Wed Jun 25 21:56:21 UTC 2014

On 6/25/2014 3:36 PM, Niles Rogoff wrote:
> >tar would be unable to correctly save the permissions on those files
> I should clarify that this only applies to NTFS partitions.
> On Wed, Jun 25, 2014 at 3:35 PM, Niles Rogoff <nilesrogoff at gmail.com 
> <mailto:nilesrogoff at gmail.com>> wrote:
>     He's saying if you, instead of copying sector by sector, decided
>     put all the files into a tar file, then tar would be unable to
>     correctly save the permissions on those files.
>     This would be in place of dd, and would not be able to copy the
>     boot sector of a device or partition
>     On Wed, Jun 25, 2014 at 2:04 PM, John Hupp <ubuntu at prpcompany.com
>     <mailto:ubuntu at prpcompany.com>> wrote:
>         On 6/25/2014 1:12 PM, Nils Kassube wrote:
>             John Hupp wrote:
>                 And point well taken: it does seem to me that, as a
>                 refinement of the
>                 initial suggested plan, gzip alone should suffice
>                 since we are dealing
>                 with a single-file output from dd and not a collection
>                 of files.
>             Well, you could use a command chain dd | gzip | tar to
>             split the output
>             for several DVDs including a prompt for the next medium.
>             BTW: If you want to save data only, you shouldn't use tar
>             for ntfs
>             partitions because tar doesn't know about the ntfs
>             permissions which
>             different from the Unix permissions.
>             Nils
>         Tar must do some processing of its source contents then?  The
>         original suggestion for using dd in this thread came from
>         Niles Rogoff, and his prescription was to use usplit.  I don't
>         know that this command is native to Ubuntu, but I believe
>         split is.  And if split merely does that, then it seems like
>         ntfs or unix permissions should be preserved.  Agree?
>         And I think I still have this question lingering: Does dd
>         knows how to prompt for the next DVD (the next split) during a
>         restore operation?
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I am currently thinking this procedure may work:

Wipe Windows partition free space: D/L Sdelete from 
http://technet.microsoft.com/en-us/sysinternals/bb897443.aspx, save to 
c:\windows\system32, and run:
$ sdelete -z c:

Wipe Linux partition free space: Boot *buntu Live disc, install 
zerofree, and run:
$ zerofree -v /dev/sda5

Then for an external hard drive mounted at 

$ cd /media/user/HD-PCTU2/laptop-image
$ sudo -i
# dd if=/dev/sda bs=64K | gzip -c -9 | split -b 4500M - drivebackup.img.gz


After that, I would have to manually burn the the various 
drivebackup.img.gz files to DVD.

Apart from corrections/improvements to the above, I still have two 
1) For restore, if I boot a *buntu Live disc, just before running a dd 
restoration command, can I remove the *buntu disc and insert the first 
image DVD?
2) Does dd knows how to prompt for the next DVD (the next split) during 
a restore operation?
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