brent It's not recognizing your disk because its not formatted correctly or https://getsol.us/articles/installation/disks/en/ (regarding efi or legacy partition creation) and https://getsol.us/articles/troubleshooting/installation-issues/en/ ---both short reads and the issue is likely in there or W10, if you have it, is being being a pill or there's probably more reasons than this why solus won't recognize your hdd at install but not at top of head.
avinav If you are willing to erase your disk, you can use gnome-disk to format the hard-disk. You'll probably have to format it as ext4.
