File System Space Requirements for R12 Standard Installation

Minimum disk space Requirement for R12 installation

Applications node file system (includes OracleAS 10.1.2 & OracleAS 10.1.3Oracle Home, COMMON_TOP, APPL_TOP, and INST_TOP) : 35 GB (50 GB on HP-UX Itanium)
Database node file system (Fresh install)      : 55 GB (65 GB on HP-UX Itanium)
Database node file system (Vision Demo database) : 208 GB (210 GB on HP-UX Itanium)