Confusing results with seatools HDD tests, is my HDD healthy?

[Opuslandia]

Hello,
I have several Seagate Hard drives and i decided to check them if ther helath is ok or not.
I used seatolls for windows, HDD tune and crystaldiskinfo.

Then seatools gave smart fail error for 4TB HDD while short drvie test and short generic test seemed OK. HDD tune and crystaldiskinfo gave no error for the disk.

Then i unplugged the disk and plugged it in to another PC, and decided i was going save data in another disk and make zero fill format. But before that i wanted to check disk again with seatools.
But when i checked the disk, this time it did not give any error. Everything seemed totally fine, smart test was OK, this time.

So how is it possible that in one PC seatools gives smart fail error and in another PC does not?

 

[CountMike]

Could be some problems on that first computer. What problems did SMART show ? CRC errors would for instance indicate bad cable/connection.