Tutorial[ Seagate Disks ]: Install Seagate OpenSeaChest Utilities

[tuxd3v]

The easiest way would be taking the Seagate disk off, and do what you want in a Sata port, in another computer, them put the disk again in place( the 2 features are persistent between reboots) 
The rest it should work trough SMART..

Unfortunately, I have no way, I only own a notebook.
But I can connect via USB-HDD adapter to another computer. Will that be enough?

It could be an identical situation you have here,
It will depend on the chip that is in the usb/sata controller

But it doesn't hurt trying.. 
At least you have a option on OpenSeaChest for USB 'interfaceUSB':

Code:

openSeaChest_Basics --scan --scanFlags interfaceUSB sd sgtosd ata scsi -V 4

Another option would be instead of using the v19.01.31 stable, using the last development branch, it has several improvements, but I am not sure if you could pass commands trough pcie:
If using this option:

Code:

mkdir /opt/test && cd /opt/test && git clone --recursive --branch develop https://github.com/Seagate/openSeaChest.git && cd openSeaChest/Make/gcc && make release && cd openseachest_exes

then check again:

Code:

./openSeaChest_Basics --scan --scanFlags interfaceSCSI interfaceATA interfaceUSB sd sgtosd ata scsi -V 4

if don't succeed,

Code:

./openSeaChest_Basics --Scan --scanFlags interfaceSCSI interfaceATA interfaceUSB sd sgtosd ata scsi -V 4