Cannot save files on 5T My Passport

Hello I have a 5T Passport and for some reason I can no longer save files to it. I can only view whatever files are on it. I need help. I wish to use it on both MAC and PC Computers. Thanks

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I am also facing a similar issue. I am unable to copy stuff to my 2TB HDD which is only 25% full at the moment. Any pointer would help - thanks TIA.

try chkdsk /f on the usb disks