External hard disk not recognized - Problem with partition?

[erikernst]

Hi,

I have lost connection to an external hard disk. I think its a problem with the partition but I am uncertain how to deal with the problem.

I have run Testdisk and will paste the log below.

Any help would be much appreciated


TestDisk 6.14-WIP, Data Recovery Utility, May 2012
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org
OS: Darwin, kernel 10.8.0 (Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.1
Compiler: GCC 4.0
Compilation date: 2012-07-05T08:07:45
ext2fs lib: 1.41.8, ntfs lib: libntfs-3g, reiserfs lib: 0.3.1-rc8, ewf lib: 20120504
User is not root!
Hard disk list
Disk /dev/disk1 - 2000 GB / 1863 GiB - CHS 3907050332 1 1, sector size=512
Disk /dev/rdisk1 - 2000 GB / 1863 GiB - CHS 3907050332 1 1, sector size=512

Partition table type default to EFI GPT
Disk /dev/rdisk1 - 2000 GB / 1863 GiB
Partition table type: EFI GPT

Interface Advanced

Analyse Disk /dev/rdisk1 - 2000 GB / 1863 GiB - CHS 3907050332 1 1
Current partition structure:
Bad GPT partition, invalid signature.

search_part()
Disk /dev/rdisk1 - 2000 GB / 1863 GiB - CHS 3907050332 1 1

HFS+ magic value at 262208/0/1
part_size 3906788088
Mac HFS 262208 3907050295 3906788088
HFS+ blocksize=4096, 2000 GB / 1862 GiB

Results
P Mac HFS 262208 3907050295 3906788088
HFS+ blocksize=4096, 2000 GB / 1862 GiB

interface_write()
1 P Mac HFS 262208 3907050295 3906788088
simulate write!

Analyse Disk /dev/rdisk1 - 2000 GB / 1863 GiB - CHS 3907050332 1 1
Current partition structure:
Bad GPT partition, invalid signature.

search_part()
Disk /dev/rdisk1 - 2000 GB / 1863 GiB - CHS 3907050332 1 1
Search for partition aborted

Results

interface_write()

No partition found or selected for recovery

[smith]

Hi
your hard disk may effect with virus so that's why your partition was hidden. you can recover partition from hard drive with the help of a recovery tool. Because i also faced similar problem last time and recovered my partition using that tool. Download the software from the website and install in your system. you can recover with simple steps

[Fiona]

I think ,there is no necessity to download any software!
Currently your GIUD partiton table is empty.
Would it be possible to register that found partition back to your GUID partition table?

Analyse Disk /dev/rdisk1 - 2000 GB / 1863 GiB - CHS 3907050332 1 1
Current partition structure:
Bad GPT partition, invalid signature.
Here is no partition but there should be one, its your current partition table.
search_part()
Disk /dev/rdisk1 - 2000 GB / 1863 GiB - CHS 3907050332 1 1

HFS+ magic value at 262208/0/1
part_size 3906788088
Mac HFS 262208 3907050295 3906788088
HFS+ blocksize=4096, 2000 GB / 1862 GiB

Results
P Mac HFS 262208 3907050295 3906788088
HFS+ blocksize=4096, 2000 GB / 1862 GiB
TestDisk found a GUID partition table as usual for an Intel MAC:
interface_write()
1 P Mac HFS 262208 3907050295 3906788088
simulate write!

Can you mark the menu "Write" and write that partition to your Guid partition table?

Please close TestDisk using Quit and restart.