GPT Protective Partition (inaccessible 3TB external disk, Windows)

How to use TestDisk to recover lost partition
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chrisfox
Posts: 1
Joined: 21 Nov 2018, 07:12

GPT Protective Partition (inaccessible 3TB external disk, Windows)

#1 Post by chrisfox »

Disk is marked GPT Protective (Windows 10)

Need testdisk instructions to recover lost partition... my wife's photography :(

I have 3 physical disks. This is the 1 I need to recover:
Media: /dev/sdc 746 GiB WDS WD30 EZRX-00SPEB0

I've used a few other tools to see the data is there but the partition table is screwed up. I want to be able to recover the data. Looks like testdisk can do it but I need help - any help greatly appreciated.

I've followed earlier instructions in this forum re:
Run TestDisk 7.1-WIP, select the disk, EFI GPT, Analyse, Quick Search, Quit and copy/paste the content of the testdisk.log file:

Wed Nov 21 19:07:27 2018
Command line: TestDisk

TestDisk 7.1-WIP, Data Recovery Utility, September 2018
Christophe GRENIER <grenier@cgsecurity.org>
https://www.cgsecurity.org
OS: Windows 8 (9200)
Compiler: GCC 6.4, Cygwin 2009.0
ext2fs lib: 1.43.1, ntfs lib: 10:0:0, reiserfs lib: none, ewf lib: 20140608, curses lib: ncurses 6.0
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(/dev/sda)=1000204886016
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(/dev/sdb)=250059350016
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(/dev/sdc)=801569726464
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\PhysicalDrive0)=1000204886016
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\PhysicalDrive1)=250059350016
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\PhysicalDrive2)=801569726464
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\C:)=224049579520
disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO(\\.\D:)=1000202043392
filewin32_getfilesize(\\.\E:) GetFileSize err Incorrect function.

filewin32_setfilepointer(\\.\E:) SetFilePointer err Incorrect function.

Warning: can't get size for \\.\E:
Hard disk list
Disk /dev/sda - 1000 GB / 931 GiB - CHS 121601 255 63, sector size=512 - ST31000333AS, S/N:9TE17X0Q, FW:CC1F
Disk /dev/sdb - 250 GB / 232 GiB - CHS 30401 255 63, sector size=512 - Samsung SSD 850 EVO 250GB, S/N:S21MNSAG211773Y, FW:EMT01B6Q
Disk /dev/sdc - 801 GB / 746 GiB - CHS 97451 255 63, sector size=512 - WDC WD30 EZRX-00SPEB0, S/N:DCC4E7149888

Partition table type (auto): Intel
Disk /dev/sdc - 801 GB / 746 GiB - WDC WD30 EZRX-00SPEB0
Partition table type: EFI GPT

Analyse Disk /dev/sdc - 801 GB / 746 GiB - CHS 97451 255 63
hdr_size=92
hdr_lba_self=1
hdr_lba_alt=1565565871 (expected 1565565871)
hdr_lba_start=34
hdr_lba_end=1565565838
hdr_lba_table=2
hdr_entries=128
hdr_entsz=128
Bad GPT partition entries, invalid checksum.
Trying alternate GPT
Bad GPT partition, invalid signature.
Current partition structure:
Bad GPT partition entries, invalid checksum.
Trying alternate GPT
Bad GPT partition, invalid signature.

search_part()
Disk /dev/sdc - 801 GB / 746 GiB - CHS 97451 255 63
file_pread(6,2,buffer,1565566975(97452/9/29)) lseek err Invalid argument
file_pread(6,1,buffer,1565566975(97452/9/29)) lseek err Invalid argument
Search for partition aborted

Results

interface_write()

No partition found or selected for recovery

search_part()
Disk /dev/sdc - 801 GB / 746 GiB - CHS 97451 255 63
file_pread(6,2,buffer,1565566975(97452/9/29)) lseek err Invalid argument
file_pread(6,1,buffer,1565566975(97452/9/29)) lseek err Invalid argument
Search for partition aborted

Results

interface_write()

No partition found or selected for recovery

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cgrenier
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Re: GPT Protective Partition (inaccessible 3TB external disk, Windows)

#2 Post by cgrenier »

Looks like an hardware problem. You wrote it's a 3TB harddisk but the disk is reported as 800GB.
This problem need to be fixed before using a data recovery utility.

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