Re: dead disk data recovery

From: Peter D. (psd_at_c17.home.invalid)
Date: 03/23/04

  • Next message: Bill Marcum: "Re: Help! RTL8139" 
    Date: Tue, 23 Mar 2004 10:26:05 +1100

    Henrik Carlqvist wrote in comp.os.linux.hardware:

    [snip]
    > Maybe this is a good time to tell youre freind about some good backup
    > strategies.

    The subject came up almost immediately.

    [snip]
    > No, you should never mount the enitre disk (like hdc) when it has
    > partitions.

    O.K. How about /accessing/ the entire drive with dd in an attempt to
    copy the entire disk - including partition structure?

    > When trying to do a rescue you should probably also not try to
    > mount a partition on a broken disk.

    Well certainly not read_write, but read_only. That is not going to
    do anything bizarre like try to update access times, is it?
    BTW It is a Windows disk, so it won't actually have access times.

    > This depends a bit upon
    > what you are trying to rescue. If you are only trying to rescue a
    > single or a few files you could try to mount the partition read only
    > and then try to save the files.

    Only a few.

    > If you are trying to save the entire contents you should instead doing
    > dd of entire partitions to image files. If you are doing dd you should
    > not mount anything from the broken disk first. Once the copies are
    > done you might be able to mount the images. Something like:
    >
    > dd if=/dev/hdc1 of=/var/tmp/hdc1_rescue.img mount -o loop,ro
    > /var/tmp/hdc1_rescue.img /mnt/hd cd /mnt/hd
    > tar -cf - . | (cd /mnt/partition/on/new/disk ; tar -xvf -)

    There must be some newlines or semi-colons missing from that.

    This is what I think you meant.
            dd if=/dev/hdc1 of=/var/tmp/hdc1_rescue.img
            mount -o loop,ro /var/tmp/hdc1_rescue.img /mnt/hd
            cd /mnt/hd
            tar -cf - . | (cd /mnt/partition/on/new/disk ; tar -xvf -)

    Is it necessary to mount the image read only? I guess it can't hurt.

    Thank you Henrik. 

    -- 
Sig goes here...
Peter D.
  • Next message: Bill Marcum: "Re: Help! RTL8139"

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