Yes, up to that point. I don't know what type of server you're running but with MCS-7835 server, the hard drives are configured for mirroring RAID 1. Basically the same data is written on both hard drives, you can always pull one out to keep for back up in case of disaster.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.