If you need to enable ssh access in your nas device is easy.
For example if your nas ip is 192.168.0.24 open a web browser with https://192.168.0.24/supportaccess.html
mark Allow remote access for support (SSH and SFTP)
click apply and iomega ix4-200d will reboot
to access over ssh your need to add soho prefix in your password. For example if your admin password is peter your ssh password will be sohopeter
I use an old computer for testing purposes at home, one problem of grub is when you install a windows system it removes grub and you can’t access to your Centos 7 system.
reinstall grub is really easy.
Boot your computer from a dvd o flash memory with centos 7 install disk
select troubleshooting menu
Select rescue a Centos system
when boot ask you how to mount a system select continue and it gives you access to a shell.
grub2-install –root-directory=/mnt/sysimage/ /dev/sda
a then reboot