I am clearly being dumb with this I think, I have been transfering a lot of files from my local Windows machine to my Unraid tower and it has only copied around 500gb, the remaining 500gb was returning the error that it cannot find the location specified in Teracopy, I then tried manually moving some files in windows explorer to the share and it told me there was not enough free space to complete.

I have anywhere from 1.4TB to 1.84TB free on my 6 disks (total of 8, the other 2 are parity drives)

I wanted to get the task complete so I turned on disk sharing and shared disk 4, entered that in windows and can copy all my required files to that disk without any issues or warnings.

Do you guys have any thoughts on this?

All shares have a minimum space set of 1.8TB on them with the high water setting, this was automatically set by Unraid, I changed the specific share I was trying to copy to down to 1TB to test a transfer and it still failed when trying to write to the share so I am not sure if the minimum free space is the issue here.

Please post the diagnostics and the share name you are writing to.