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As it was described already above Photorec doesn't see my 1T HDD on my iMac 2017 and shows only MacOs SSD partition. Really hoping on your help guys, thank in advance.
I have installed the brew and the program itself through it as well as I have the admin rights, but maybe I have done something wrong idk.

PhotoRec 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <grenier@cgsecurity.org>
https://www.cgsecurity.org

PhotoRec is free software, and
comes with ABSOLUTELY NO WARRANTY.

Select a media (use Arrow keys, then press Enter):
>Disk /dev/disk0 - 28 GB / 26 GiB (RO)
Disk /dev/rdisk0 - 28 GB / 26 GiB (RO)

>[Proceed ] [ Quit ]

Note:
Disk capacity must be correctly detected for a successful recovery.
If a disk listed above has an incorrect size, check HD jumper settings and BIOS
detection, and install the latest OS patches and disk drivers.

Does your Mac see the hard disk drive as a device at least?

yes it does

How does Testdisk and Photorec react when connecting your drive to a Windows machine?
Any results?

I don't have any idea actually, because this actual hdd is embedded in the computer itself and I can't remove it without taking off the screen, there is an option to emulate this drive in so called "target disk mode" which actually just gonna convert a hdd to the basic storage drive, accessible through the thunderbolt cable which connected to another computer.

fast666 wrote: 29 Mar 2022, 09:54 As it was described already above Photorec doesn't see my 1T HDD on my iMac 2017 and shows only MacOs SSD partition. Really hoping on your help guys, thank in advance.
I have installed the brew and the program itself through it as well as I have the admin rights, but maybe I have done something wrong idk.

PhotoRec 7.1, Data Recovery Utility, July 2019
Christophe GRENIER <grenier@cgsecurity.org>
https://www.cgsecurity.org

PhotoRec is free software, and
comes with ABSOLUTELY NO WARRANTY.

Select a media (use Arrow keys, then press Enter):
>Disk /dev/disk0 - 28 GB / 26 GiB (RO)
Disk /dev/rdisk0 - 28 GB / 26 GiB (RO)

>[Proceed ] [ Quit ]

Note:
Disk capacity must be correctly detected for a successful recovery.
If a disk listed above has an incorrect size, check HD jumper settings and BIOS
detection, and install the latest OS patches and disk drivers.

I dont know what "idk" means.
I don't know why your disk size is not recognized properly and have no idea what to do know.