Todd Denniston wrote:
Andrea Mastellone wrote, On 09/24/2008 11:12 AM:
Hi,
I have a broken solid state disk, in facts badblocks has found about a
hundred of damaged blocks. The most shortcoming is that I have lost
the partition table too, and I suspect that some bad blocks are in
relation with the partition table data since testdisk can not write
the recovered partition table to the disk. Now, I need to rescue a 10
GB ext3 partition (that is the last one on device).
So, I would like to use dd (or dd_rescue) to physically transfer the
partition in a file on an ext3 USB disk, and then mount the file as an
ext3 partition (like an iso file by means of loopback device, is it
possible ? how ?).
Since I am poor experienced with the CHS and LBA notations, someone
can me confirm this: testdisk signals that the partition begins at
6403, 1 ,1 and ends at 7798, 254, 63 in CHS notation. Since the disk
has 255 heads and 63 sectors, the corrispective LBA addresses would be
102864258 and 125290810, isn't it ?
if I had less space (and no time to buy an extra USB hard drive) and
could translate the CHS to bytes/blocks of disk space, I would do
something like:
assume 512 blocks, and HeadSector size of 7697074bytes
bc of 7697074*6402/512 yields 96243491 which is probably completely wrong.
(is this roughly a 55GB device?)
dd if=/dev/whole_solid_state_disk \
of=/path/to/spare11GB/SSD.image \
seek=96243491 conv=noerror bs=512
And remember, the device is already failing... you MIGHT only get one
more read, so take that into consideration when choosing the method for
getting the image.
Successful ! I just issued
dd if=/dev/hda of=/mnt/usb/partition skip=102864258 count=22426552
and then
mount -o loop /mnt/usb/partition targetdir/
and all important data have been fully recovered !!
Andrea
--
fedora-list mailing list
fedora-list@xxxxxxxxxx
To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
