bigj231 wrote:Try unmounting it before running the installer.
I've tried with it mounted / unmounted / with it formated to ext4 / & clearing the partitions and trying with a blank disk.
All with the same result. The disk will not show in the install window
I have another larger 1TB disk, that will show up, but I would really like to install Linux Mint to the 250GB drive, and use the 1TB for storage.
Thank you very much for your reply though, and I look forward to any other suggestions you or anyone else may be able to offer.