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Hello,
I have really bad situation here :(
I've tried to access my drive one day, the explorer hanged, crashed, so I restarted the PC.
Windows 10 tried to chkdsk for me, but it took so long and I did what most people do - pushed the restart button hoping that nothing will happen as always.
How wrong I was :(
Now, my disk (which had 1, I believe exFAT, partition) in widnows is 0B, when I double click it - it opens, but shows nothing (it is also visible in bios).
Now, the strange things happens.
I can clearly see the disk under My Computer and disk management (on disk management it also has the proper number, size and shows that my partition is raw). When I try to checkdisk it from my computer, I got info that checkdisk can't access it.
Ok, let's go somewhere further.
I open cmd and diskpart, I list disk and... there is no my disk. I list volumes and I can see my volume with proper size. BUT! Disk Management shows me, the disk is Disk0, and when I type 'select disk 0' in diskpart, it selects! And I can list the partition also and select it.
I open EaseUe Partition Master - I can't see my disk, and also can't see the partition.
I open Gparted on livecd - Gparted is endlessly scanning. When I run from the terminal fdisk, I can see my disk with the partition, but I can't mount it (invalid argument) - also, when booting from livecd i got some I/O errors on that disk (see attachement).
I open it with m3datarecovery - the disk is visible, however it has 0 bytes and it doesn't see any partitions.

I have some valuable data there, like... really valuable. How should I handle that matter so I don't loss it?

Thanks for help,
Mateusz
 

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Most likely a corrupt partition table... While this is not required, I'd always recommend it.. Use any utility and do a Hard Disk raw image backup, (lot of tools available) it will capture the entire disk as an image and store this as a single file elsewhere... Ensure you have enough space..

Then follow the instructions here https://www.cgsecurity.org/wiki/TestDisk_Step_By_Step to restore/recover the partition table, you should be able to get your data back.

Once this is done, backup all your data, do a Full format of the Disk and then start using it..
 

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i got some I/O errors on that disk
How are you connecting the disk to the computer? Is it plugged directly into the Motherboard? Or is it connected via a USB Adapter, Dock or Enclosure?
If the drive is not USB and plugging directly into Motherboard, then replace the data cable, try replacing the Power Plug, try a different port on the motherboard, try the disk in another computer.
If USB remove it from the enclosure and plug it directly into the desktop computer.
 

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I would start by examining the drive's SMART report with a tool such as CrystalDiskInfo:

https://crystalmark.info/en/software/crystaldiskinfo/

Look for reallocated, pending or uncorrectable sectors.

Then I would clone the drive with a tool such as ddrescue or HDDSuperClone. Both tools understand how to work with drives that have bad heads or degraded media.

http://www.sdcomputingservice.com/hddsuperclone‎

Next I would examine the clone with a disc editor, eg DMDE:

DMDE (DM Disk Editor and Data Recovery Software):
https://dmde.com/
 
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