Welcome to Mint plowran
Please respond with the exact error message. UID=1000 is probably "you"
To mount you (normally) have to be root - i.e. use sudo.
You can bypass that by adding the disk in fstab. To tell you what you should add i need more info, such as file system and number of partitions
Don't fix it if it ain't broken, don't break it if you can't fix it