Can newly purchased TNAS be immediately used?

No! Newly purchased TNAS cannot be used prior to the completion of initialization, which include the followings:
1. Install the hard drive (in case that the hard drive is not installed in your purchased TNAS).
2. Download and install TNAS desktop application.
3. Update TOS software.
4. Creat RAID and format it
TNAS is ready to be used after above steps are completed.