Mount partiton as ext3

Roman78

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Hello to all, i'm new here. Just started with Linux (Mint) some month ago. Now i have a question about data rescue.

Let me start by the beginning. A college of mine has a drown NAS, a WD My Cloud. The NAS-Controller seems to be broken, but the harddisk is still working. Now i connected the harddisk to one of my Linux computers, first via USB, but that didn't worked. The Harddisk is to big (4Tb) for the controller, so i connected it directly to the mainboard. And here it went a little wrong, somehow the bootsector got rewritten and the partition shows up as MS-Data instead of ext3.

This is how it looks like:

Code:
Festplatte /dev/sda: 3,65 TiB, 4000787030016 Bytes, 7814037168 Sektoren
Festplattenmodell: WDC WD40EFRX-68W
Einheiten: Sektoren von 1 * 512 = 512 Bytes
Sektorgröße (logisch/physikalisch): 512 Bytes / 4096 Bytes
E/A-Größe (minimal/optimal): 4096 Bytes / 4096 Bytes
Festplattenbezeichnungstyp: gpt
Festplattenbezeichner: AA57E45C-3311-41A5-A289-5E56129BCE23

Gerät       Anfang       Ende   Sektoren Größe Typ
/dev/sda1  1032192    5031935    3999744  1,9G Linux RAID
/dev/sda2  5031936    9031679    3999744  1,9G Linux RAID
/dev/sda3    30720    1032191    1001472  489M Microsoft Basisdaten
/dev/sda4  9428992 7814035455 7804606464  3,6T Microsoft Basisdaten
/dev/sda5  9031680    9226239     194560   95M Microsoft Basisdaten
/dev/sda6  9226240    9422847     196608   96M Microsoft Basisdaten
/dev/sda7  9422848    9424895       2048    1M Microsoft Basisdaten
/dev/sda8  9424896    9428991       4096    2M Microsoft Basisdaten

Using testdisk i was able to see the data after i changed the type from MS-Data to ext3. Also copied lots of data from it using testdisk. But somehow it makes a read-error in a folder called "fotos/2019" and begins over and over.

Testdisk before change:
Code:
TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <[email protected]>
https://www.cgsecurity.org

Disk /dev/sda - 4000 GB / 3726 GiB - CHS 486401 255 63

     Partition                  Start        End    Size in sectors
> 3 P MS Data                    30720    1032191    1001472 [primary]
  1 P Linux Raid               1032192    5031935    3999744 [primary] [md1]
  2 P Linux Raid               5031936    9031679    3999744 [primary] [md1]
  5 P MS Data                  9031680    9226239     194560 [primary]
  6 P MS Data                  9226240    9422847     196608 [primary]
  7 P MS Data                  9422848    9424895       2048 [primary]
  8 P MS Data                  9424896    9428991       4096 [primary]
  4 P MS Data                  9428992 7814035455 7804606464 [primary]

Testdisk after change.
Code:
TestDisk 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <[email protected]>
https://www.cgsecurity.org

Disk /dev/sda - 4000 GB / 3726 GiB - CHS 486401 255 63

     Partition                  Start        End    Size in sectors
  3 P MS Data                    30720    1032191    1001472 [primary]
  1 P Linux Raid               1032192    5031935    3999744 [primary] [md1]
  2 P Linux Raid               5031936    9031679    3999744 [primary] [md1]
  5 P MS Data                  9031680    9226239     194560 [primary]
  6 P MS Data                  9226240    9422847     196608 [primary]
  7 P MS Data                  9422848    9424895       2048 [primary]
  8 P MS Data                  9424896    9428991       4096 [primary]
> 4 P Linux filesys. data      9428992 7814035455 7804606464 [primary]

But it won't write the change to the disk, it just use it for recovery.

Code:
>[  Type  ]  [Superblock]  [  List  ]  [Image Creation]  [  Quit  ]
              Change type, this setting will not be saved on disk

So i thought i just could mount the partition and use a tool like rsync to copy the rest. But how can i mount a partition containing a different file system? I tried this, but that tells me the Superblock is corrupt.

Code:
roman@roman-PH67A-D3-B3:~$ sudo mount -t ext3 /dev/sda4 /mnt/dump
mount: /mnt/dump: Falscher Dateisystemtyp, ungültige Optionen, der Superblock von /dev/sda4 ist beschädigt, fehlende Kodierungsseite oder ein anderer Fehler.
 

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