3TB disc used as 2,2TB + 3TBunlocker - partition lost

[melvin]

The owner of this 3TB Seagate was using it as 2,2TB plus was using a program called 3TB+unlocker and had important data on this 0,7GB partition. One repair shop streched the main partition to full 3TB and now data is lost. I found the partition but can't fix original names. RAW recovery found Master boot record structures and other but i didn't find them useful.
Raw results are not good enough. The owner found only one file useful for him.
Any hints how, if possible, to get original names and structures?

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[fzabkar]

ISTR there was a thread on Seagate's old forum (now defunct) which showed the FS structures in detail. IIRC, the drive appeared to the OS as two physical drives. The first was a real 2TiB physical drive while the second drive was a "virtual" physical drive.

That is, the "virtual" drive had an MBR and partition table as its first sector (at the 2TiB boundary of the 3TB drive), just as a real physical drive does. Therefore ISTM that you could clone the user area between 2TiB and 3TB to a separate disc image and work on it in the same way as for an 800TB physical drive.

Edit: Would it make sense to treat the 800TB virtual drive as a RAID1 with an offset of 2TiB?

[melvin]

I have a full copy of this disk. The first partition is all good. The second starts at 4 294 969 360 but i can't see a way to reconstruct the file structures. Can't find any info about what kind of partition does the 3TB+unlocker does and use.

[fzabkar]

ICBW, but ISTR that the 800TB "drive" is just a normal NTFS volume. Could we see the MBRs and boot sectors?