On Sat, Aug 29, 2009 at 07:36:08PM +0200, Thomas Bächler wrote:
> ERROR: ambivalent result detected (2 filesystems)!
>
> What is the best solution here?
Use the latest version of cryptsetup.
cryptsetup 1.0.7 changelog:
- Wipe start of device (possible fs signature) before LUKS-formatting.
> Is there a tool that wipes out the old magic numbers from ext2/3/4?
(I'd like to add SBMAGIC, SBMAGIC_LEN, SBMAGIC_OFFSET values to
libblkid, then should be pretty simple to wipe all signatures in mkfs
programs or create a new wipefs(8) tool or so.)
Now, if you really hate your data you can try to use with dd(1) ...
extN magic number is \x53\xef at offset 1080:
$ blkid -p ~/ext2.img
/home/kzak/ext2.img: LABEL="COOL" UUID="ed409e8e-44cc-4c2e-a31a-cd98f54eff36" VERSION="1.0" TYPE="ext2" USAGE="filesystem"
$ hexdump -C -s 1080 -n 2 ~/ext2.img
00000438 53 ef |S.|
$ dd if=/dev/zero of=~/ext2.img bs=1 seek=1080 count=2 conv=notrunc
2+0 records in
2+0 records out
2 bytes (2 B) copied, 0.000123413 s, 16.2 kB/s
$ hexdump -C -s 1080 -n 2 ~/ext2.img
00000438 00 00 |..|
0000043a
... but think twice. Really.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
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