i have zorin installed and is working fine but i have another hdd trying to use i have it set to auto mount but for some reasons after being mounted for about a minute it unmounts not sure why i can remount after about a minute does the same. thanks
Are you certain this is HDD? Not SSD?
If HHD, a lot of spinning of the hard drive may cause power management to end the process if connected by USB, like an external mounted HDD.
Try using a different port, and possibly another computer to verify if it's an issue with the drive itself.
Also, does this happen even while you're using the drive? For example, while navigating folders located inside the drive, copying files, etc.
It is indeed possible, that the system is putting your HDD to sleep when not in use over USB. Changing your system settings to high performance should prevent this.
Additionally, please make sure your mount drive options are set like this in the checked boxes.
PS: Recommend the use of SSD external drives in modern day. They are far more robust, cause much less issues, and overall, more easier to use.