G drive mobile SSD 1TB not repairing with Disk Utility or DiskWarrior

My newish 1TB drive had been working fine. Now it wont accept any files. It is showing in Disk utility as 220GB used but these files dont show up in finder. I tried to reformat the disk with disk utiity but this failed. I purchased Disk Warrior as this seemed to be recommended in previous posts and this failed to rebuild the disk. I have a 2TB disk that works perfectly. Not sure how to try and get the disk working again.