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To render to disk, simply change the Display Device to a file type, such as OpenEXR.  Press the Render button. The default RIB type is binary and cannot be hand edited. You can change this in the ROP node Options | RIB

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Driver

 Image Added

• Write RIB - Export a RIB file on rendering
• Binary - By default we write a compact file, but for hand-editing or debugging, uncheck this ti output a larger ASCII file
• As Archive - This output will contain scene entities but not global data like render settings or displays, this file is not renderable on its own but can be referenced later in scenes
• Disk File - The output location of the RIB file, this defaults to your scene file (.hip) location
• VDB Path - export location of VDB data
• Create Intermediate Directories - Create the appropriate file structure automatically
• Initialize Simulation OPs - All POP and DOP will be reset to initial states when rendering
• Show SOHO viewport menu by default