gpart recovery FreeBSD 7.4

Jean M. Vandette jmvandette at
Mon Apr 2 04:11:38 UTC 2018


When you say dd the first sector of the disk
are you referring to mfid0 itself or the / partition mfid0p3 ?

I have all the dd of /

Let me know

Jean M Vandette

Sent from my iPhone

> On Apr 1, 2018, at 11:52 PM, Erich Dollansky <freebsd.ed.lists at> wrote:
> Hi,
> On Sat, 31 Mar 2018 18:43:06 +0000
> "Jean M. Vandette" <jmvandette at> wrote:
>> I used the recoverdisk
>> root at central:/ # recoverdisk /dev/gpt/root /mnt2/root.img
> I never used this program.
>> I did newfs on the boot then it mounted seems it does not recognize
> That was dangerous. When I have had the problem I really went down to
> read the partition information from the disk into a file and tried to
> understand it.
> This method helped recently when a disk has had developed so many bad
> sectors that it shrank its size during a boot. So, I did the same with
> its GPT information, mounted it, made a backup of the last hours of
> work and returned it to the manufacturer.
>> I don't have other mount points ie disks to make copy.
> This is a real problem at this stage.
>> the recoverydisk with state 0 says it encountered no errors so it is
>> seeing the data (I presume) just it is a binary file it seems.  Now
>> is the data usable is another question.  Using more or less I see a
>> lot of binary gibberish so far.
> Yes, the data is all binary. The key to any disk is its first sector.
>> I don't know if there is a way to write the superblock information
>> without losing all the data if you or anyone knows I would appreciate
>> the procedure. Did it once before or should say my mentor did it back
>> on 3.1 and then was able to fsck and mount the data.
> This is all not a problem but it come much, much later. There is
> something wrong with your partitioning tables. I would try to find this
> out.
> Get a hex editor of your choice. dd the first sector of the disk, open
> it in the editor. I used Wikipedia to provide me with the structure
> information of the disk. This all depends how it was partitioned and
> later formatted. MBR, GPT ...
> I know that this is hard work and will take time.
> Erich


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