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Sorry I was busy last days...

I can't plug the HDD internally (I own only laptops) and can't create image file as I don't have a large enough drive to hold the broken one data.

Thank you very much for your time but I think I'll suggest to my friend to buy a data recovery software and a brand new ...

Here is the result of CrystalDisk, the damaged disk is the Samsung one ----------------------------------------------------------------------------
CrystalDiskInfo 4.1.4 (C) 2008-2011 hiyohiyo
Crystal Dew World : http://crystalmark.info ...

Well, the Quick search is not yet finished and I now have "Read error at XXX" at each sector.

It seems the HDD will end in a garbage

I just need to find a way to retrieve data...

Here is the result of Analyse:
Disk /dev/sdb - 1000 GB / 931 GiB - CHS 15200 255 63
Current partition structure:
Partition Start End Size in sectors

Invalid FAT boot sector
1 P FAT32 LBA 0 32 33 121601 25 24 1953519616
1 P FAT32 LBA 0 32 33 121601 25 24 1953519616
No partition is bootable ...

I relaunched the Rebuild BS on a PC but it's still as much slow. At this rate the command will end in 6 days.

Any clue to speed up the process?

Ok, i'll try to find an Intel PC and I'll keep you informed.

Thank you for the tip

Apparently it will take some times to complete...

I launched it 30 minutes ago and I'm at the step

FAT : 32
Search root cluster 8192/15261422 0%

I'll let you know if it leads somewhere

Yes I choose Intel and yes there is the Rebuild BS option.

Should I choose it?

Here is the result:

Disk /dev/disk1 - 1000 GB / 931 GiB - CHS 244190646 1 1
Partition Start End Size in sectors
1 P FAT32 LBA 2048 1953521663 1953519616

Boot sector
Bad

Backup boot sector
Bad

First sectors (Boot code and partition information) are not identical.
Second sectors ...

Some more informations:

I'm running Quick Search and here is the result so far:
Disk /dev/disk1 - 1000 GB / 931 GiB - CHS 244190646 1 1
Analyse cylinder 2883584/244190645: 01%


check_FAT: Incorrect number of bytes per sector 512 (FAT) != 4096 (HD)
Invalid FAT boot sector
0 D FAT16 LBA ...