Re: ext4 superblock overwritten

From	"Thomas Schmitt" <scdbackup@gmx.net>
Newsgroups	linux.debian.user
Subject	Re: ext4 superblock overwritten
Date	2016-12-09 16:10 +0100
Message-ID	<sMuY9-4Pn-1@gated-at.bofh.it> (permalink)
References	<sMozn-T1-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi,

Heinz Nimmervoll wrote:
> https://i.stack.imgur.com/ciaLG.png

Hard to say from what the right side data might stem.
Left side indeed beared the ext4 magic number at bytes 0x38 and 0x39.

> How is it possible, that even the magic number (and everything else) got
> overwritten?

Most natural explanation would be direct writing to the partition device
or its overall storage device rather than via the filesystem driver:

  dd of=/dev/sda if=/file/with/right/side/data

Of course it could also have been a mad filesystem driver, a mislead
partition editor and/or filesystem formatter, a hardware error, ...

Have a nice day :)

Thomas

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Re: ext4 superblock overwritten "Thomas Schmitt" <scdbackup@gmx.net> - 2016-12-09 16:10 +0100

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