However for all Advanced Archival Products Inc’s claims, San Diego, California-based Andataco Inc is less than enamoured of Amass and has cancelled its contract with Advanced Archival for the software for use on its Ensemble storage line because, it says, Amass is a proprietary optical file system supported on a limited number of Unix systems: Network File System must be used on top of Amass file system to make the optical storage system available to the network. Instead, Andataco is offering its own optical file server, Ensemble/OFS, which it claims does not require software drivers and is compatible with any system using Network File System or Novell Inc NetWare. It comes with an Ethernet controller with embedded Network File System and NetWare protocols and doesn’t use cycles on the host system. Ensemble/OFS libraries go from $13,000 for a 20Gb system to $80,000 for a 187Gb unit.