Yeah I had same issue. I’ve tried Armbian and there was no additional discs visible, but I’ve tried RedxaOS and all SSDs + HDD is visible for me ( Rock 5C - PentaHat and EMMC - #5 by tom.i )
I’m actually on this:
radxa@rock-5c:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookwormradxa@rock-5c:~$ uname -a
Linux rock-5c 6.1.43-15-rk2312 #3176a44da SMP Wed Jul 31 04:27:40 UTC 2024 aarch64 GNU/Linux