Date: Mon, 2 Apr 2018 04:11:28 +0000 From: "Jean M. Vandette" <jmvandette@securenet.net> To: Erich Dollansky <freebsd.ed.lists@sumeritec.com> Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: gpart recovery FreeBSD 7.4 Message-ID: <D351E5C7-1C39-440B-9794-91D25FDAFDF3@securenet.net> In-Reply-To: <20180402115102.08679f26.freebsd.ed.lists@sumeritec.com> References: <6b89534c97b14e51b67581e34efac71c@securenet.net> <20180330221523.0b5f8fdd.freebsd.ed.lists@sumeritec.com> <a1ad4c0f59e240e4a87d5feb0dcc9344@securenet.net> <20180331070140.00a1b6fa.freebsd.ed.lists@sumeritec.com> <aab034b9617b42dcb4cf74dc6811dec3@securenet.net> <20180331204056.619965d1.freebsd.ed.lists@sumeritec.com> <3856200b233947ca939e1c5ffa152661@securenet.net>, <20180402115102.08679f26.freebsd.ed.lists@sumeritec.com>
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Erich 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@sumeritec.= com> wrote: > > Hi, > > On Sat, 31 Mar 2018 18:43:06 +0000 > "Jean M. Vandette" <jmvandette@securenet.net> wrote: > >> I used the recoverdisk >> root@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 ------------------------------- Checked by AVG. Version: 16.0.8039 / Virus Database: 4793/15532 - Release D= ate: Sun Apr 01 09:04:00 2018. The message does not contain any threats. -------------------------------
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