External Hard Disk - Partition damaged or deleted after power failure

Message

tops · #1 Post by **tops** » Yesterday, 22:19

Starting a new topic from this => viewtopic.php?t=13154

In this topic, I will try to put as much information as I can about my problem, to see if you can help me.
Thank you anyway so far.
-------
I have an external hard disk, Seagate Expansion Desktop Drive, with a Seagate Barracuda 3000 GB hard disk, model ST300DM001, with a single partition, formatted in ext4 (it has been formatted in NTFS before).

This hard disk had a problem with the power supply (the power supply burned out) during a power surge caused by the local provider where I live.

Ok, I bought a new power supply, with the same voltage and current specifications to replace the burned-out power supply and I made the change, where I could see the disk spinning again, but to my despair, there are no partitions on it...

Here at home, I have computers with Windows and Linux and I'm using Linux to try to recover my ext4 partition with testdisk...

When I run the command "sudo fdisk -l", I have the following information:

Code: Select all

Disk /dev/sdb: 2.73 TiB, 3000592977920 bytes, 73256645 sectors
Disk model: Expansion Desk
Units: sectors of 1 * 4096 = 4096 bytes
Sector Size:(logical / physical): 4096 bytes / 4096 bytes
I/O Size: (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel typ: dos
Disk Identifier: 0x6645f9080

Ok, running testdisk with the command "sudo testdisk # start testedisk", I asked it to create a new log and I'll share it with you in the next post...

Next, I can identify my disk in the list shown as:

Code: Select all

"Disk /dev/sdb - 3000 GB / 2794 GiB - ASMedia Expansion Desk"

Next, testdisk asks me to select the partition table type. Here by default, it detects it as "EFI GPT", however, I don't believe that's true. Could you explain this to me better? I believe that here, it should be Intel... I ask him to continue with Intel and I start the analysis with the quick analysis...

Testdisk shows me 2 options in the list that I put below, but a message worries me:

Code: Select all

TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <grenier@cgsecurity.org>
https://www.cgsecurity.org

Disk /dev/sdb - 3000 GB / 2794 GiB - CHS 357698 64 32

The harddisk (3000 GB / 2794 GiB) seems too small! (< 6001 GB / 5589 GiB)
Check the harddisk size: HD jumper settings, BIOS detection...

The following partitions can't be recovered:
     Partition               Start        End    Size in sectors
>  HPFS - NTFS          357698  19 21 715396  37 10  732566070
   HPFS - NTFS          357698  31 32 715396  55 31  732566272









[ Continue ]
NTFS, blocksize=4096, 3000 GB / 2794 GiB

So, from here on, whichever of the two options I choose, it doesn't return anything, but before continuing, I think it's important to share this information:

Code: Select all

TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <grenier@cgsecurity.org>
https://www.cgsecurity.org

Disk /dev/sdb - 3000 GB / 2794 GiB - CHS 357698 64 32

Warning: the current number of heads per cylinder is 64
but the correct value may be 255.
You can use the Geometry menu to change this value.
It's something to try if
- some partitions are not found by TestDisk
- or the partition table can not be written because partitions overlap.










[ Continue ]

I'd like some suggestions on whether I'm on the right track or not. Of course, I'd like to ask about recovery, which is something we probably don't have the answer to at this point.

The important thing is that, at least since the power supply burned out, I've only replaced it with a similar one and haven't burned anything to the hard drive—I think that's important.