How to Prevent Chrome OS From Mounting Other OS Partitions

[gladams]

I'm running Brunch with a dual boot Linux Mint setup on my old Dell Inspiron Core i7 laptop. CPU runs at max and hot unless I "eject" the other partitions from the Files app, then it's smooth as butter and low CPU usage. Can anyone tell me how to prevent Chrome OS from mounting my other hard drive partitions, so I don't have to "eject" it every time I log in? I've read some things about modifying fstab, but also some stuff that Chrome OS doesn't use fstab much. Any help would be great.