You could start by showing the output of the commands in my previous posts. And checking you have exfat-fuse and exfat-utils installed.
I think we could quite easily get to the bottom of this if you would follow instructions.

Per the poster above's comment I have never seen a 1tb SD card. If the card came from wish.com/chinese seller on ebay, and/or didn't cost a fortune then it's not really a 1tb card. It's fake. IF something like that existed it would be hundreds of dollars. Likely it's a micro SD card if it's the same a mobile phone card. Sandisk only list a 512mb micro sd card on its site. Cost approx 300 dollars on amazon. If your 1tb was not something in the region of a grand it's fake.

If it really was a 1tb card and you are very rich and very lucky it still wont work properly unless you have got exfat installed on your system.

As the other poster said it's a read only file system, which means even root can't do anything so unless you want to get to the bottom of why that is you are wasting your time. But if the card is a fake you are super wasting your time anyway.

UK
eBay item number:
173605107188
£15.85

I did see another card at £30 by Hitachi when I first bought this one but that listing has now disappeared.

Amazon does not have them.

No not from the phone just laptops with Gparted and EEase partitioning tool neither worked to make two partitions as I want them.

Yes, it was formatted but I have tried partitioning and this failed on this USB/card refuses to make 2 partitions except for 30GB and 950GB but refuses to do it the other way round 950Gb and 30GB which is what I really want. So I gave up trying to partition this one.

All the smaller cards work perfectly.

Another weird thing is even though the usb/card is read only Using an iPhone it will write to the card. It seems the application on the phone iusb pro overcomes the read only protection.

ok this card is 100% a fake. That's not to say it can't be used at all but the card is most definitely not 1tb. A decent 64gb micro SD will be around £12 to £15.

I'm afraid I would throw it in the bin as you are likely to spend a lot of time trying to make something work that is dodgy. Even if you get it working it will probably have low capacity and also slow read time.

If you bought it recently raise a case with ebay and get a refund, because you have been conned. Sorry to be blunt but your best course of action is to try for a refund and chalk it down to experience.

Even slightly cheap micro SD cards are to be avoided. I rejected something like 3 or 4 micro SD cards from ebay that weren't even super cheap because I could not get them to work in my raspberry pi. I wasted a lot of time thinking i was doing something wrong. And those weren't even ones that were fake per se. In the end I got genuine sandisk ones from Amazon and they are good. I'm not a brand advocate in life generally but with SD cards I honestly think you are better off sticking to the known brands from trusted sources.

Unfortunately ebay and amazon to a lesser extend allow a lot of dodgy stuff to be sold. There's no such thing as super cheap memory, that actually works.

I agree using these cards is a waste of time. Go back and use a known reputable SD card.