Date: Mon, 11 Nov 2013 08:19:57 -0700 (MST) From: Warren Block <wblock@wonkity.com> To: Erich Dollansky <erich@alogt.com> Cc: freebsd-geom@freebsd.org Subject: Re: documentation of GEOM data structures needed Message-ID: <alpine.BSF.2.00.1311110812470.99300@wonkity.com> In-Reply-To: <20131111162400.0bc7dfef@X220.ovitrap.com> References: <20131111162400.0bc7dfef@X220.ovitrap.com>
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On Mon, 11 Nov 2013, Erich Dollansky wrote: > I would need a documentation of the GEOM data structure. A disk got > damages in a strange way during the process of backing up data. It was > partitioned with gpart as all my disks using the MBR schema. When > creating the backup, the system crashed. The disk was not usable > anymore. I found out that the MBR was overwritten before the backup was > started while the beginning of the first partition seems to be ok. MBR does not have any specific GEOM structure. It's just a standard MBR: http://en.wikipedia.org/wiki/Master_boot_record See the end of the mdconfig(8) man page for an example of using it and gnop(8) to skip over an arbitrary length of data at the start of a disk. With that and file -s, you can attempt to find mountable filesystems on the whole disk. A script would be the fastest way. The first one should be relatively easy. After that, guessing approximate locations would speed it up a lot.
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