bad relative sector or partition not found in 64gb usb3 thum

How to use TestDisk to recover lost partition
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recoverme
Posts: 3
Joined: 25 Jul 2013, 00:20

bad relative sector or partition not found in 64gb usb3 thum

#1 Post by recoverme »

Hi guys,

I was using a 64gb Uniserb USB3.0 thumbdrive for storing my RAW canon images (.cr2) while travelling in Tokyo. everything worked perfectly fine during the trip, as I transferred the images from sd card to usb drive.

when i came home, it popped up the dreaded message:

"do you want to format the drive in H: before you use it?"

since it cannot be accessed in windows explorer, i tried using testdisk to recover the files.

See attached log for more info - there are a couple of scenarios happening.

1. Testdisk would say 'Bad relative sector' and not be able to detect the partition
2. Testdisk would detect the partition, but upon doing 'Deeper Search' - the drive disconnects by itself, leading to read errors.

Image
Image
Image
Image

I also tried using PhotoRec to recover my 2,500++ images, but it ALWAYS stops at 41 images before the drive disconnects by itself and becomes undetectable in disk management. another bad part about PhotoRec is that my filenames and metadata are stripped away in the process, so i'd prefer not to do that.

as a last resort, of course, i'd rather get back all my files first, then decide what to do with it later on.

please help me! i'm really at a loss now. :(

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recoverme
Posts: 3
Joined: 25 Jul 2013, 00:20

Re: bad relative sector or partition not found in 64gb usb3

#2 Post by recoverme »

can anyone help, please?

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cgrenier
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Re: bad relative sector or partition not found in 64gb usb3

#3 Post by cgrenier »

I think there are bad sectors.
Clone the disk using ddrescue http://www.cgsecurity.org/wiki/Damaged_Hard_Disk and next use PhotoRec on the clone.
Good luck

recoverme
Posts: 3
Joined: 25 Jul 2013, 00:20

Re: bad relative sector or partition not found in 64gb usb3

#4 Post by recoverme »

Hi there,

thank u so much for your help.

i'm not a very it-savvy person and would need some guidance :

do i have to first install Knoppix (linux) on VMware first, then put the following code into the terminal in order to clone the disk? the more i read the ddrescue manual, the more confusing it got to me. would appreciate some help!

Code: Select all

# download ddrescue
wget http://download.savannah.gnu.org/releases/ddrescue/ddrescue-1.8.tar.bz2
# extract the source code
tar xjf ddrescue-1.8.tar.bz2
# compile ddrescue
cd ddrescue-1.8
./configure && make
# first, grab most of the error-free areas in a hurry:
./ddrescue -n /dev/old_disk /dev/new_disk rescued.log
# then try to recover as much of the dicy areas as possible:
./ddrescue -r 1 /dev/old_disk /dev/new_disk rescued.log

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