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Filesystem missing

Posted: 22 Sep 2025, 13:36
by ricardopt
Hi everyone!

First time on the forum, english is not my native language so i might have some difficulty explaining the situation.

I have a 4TB external drive and this morning it showed an error that it could not open it, here's some screenshots:
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tried using testdisk
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it detects partition table as none and if i select it i cant do anything on the following menus
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if i select intel and i get the following message:
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if i select quick search it goes on the cylinder search mode and i stoped the process not because of the long time it would take but i was afraid that the cilynder search would make the data somewhat disapear.

Can someone give me some advice on what to do?
Thank you

Re: Filesystem missing

Posted: 22 Sep 2025, 18:52
by recuperation
Standard strategy:
Post your SMARTMONTOOLS log file,

How to extract SMART parameters:
viewtopic.php?f=5&t=10910

post your TESTDISK log file here in the forum.

Idea: Getting as much as information from your disk without stressing it, determining further procedure.
The result of the smartmontools log file determines if you should clone your disk to prevent further deterioration.

Your disk should contain a partition table.
Problem: There are two different schemes, MBR and GPT.

MBR can only adress 2 TB, given a sector size of 512 bytes. One should assume that the partition table is GPT (more recent and can address storage beyond 2TB with a sector size of 512 byte) but

manufacturers of external hard disks sometimes install emulating electronics, that show a sector size of 4096 bytes.
If this is the case, 5TB can be addressed even with the MBR scheme.

The TestDisk log file contains information about the sector size that your computer sees.

Other ways to gather that information:
1. Ask your manufacturer!
OR
2. Buy the external disk again, look the information up using TestDisk and resell the external disk afterwards.

Having no partition table is rather the exception than the rule.

You have to select the partition table style in TestDisk that existed before the table disappeared. :?

A question arisen out of my personal interest: The language in your screenshots, is that Spanish or Portuguese?

Re: Filesystem missing

Posted: 22 Sep 2025, 19:20
by ricardopt
Hi

Just tried it but it displays
Smartctl open device: /dev/sdd [SAT] failed: \\.\PhysicalDrive3: Open failed, Error=2

ive tried another free program and upon clicking and get the following info

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