EFS

EFS (Extent File System) was the default file system from GL2-2.x through IRIX 5.3 and for all CD media distributed by SGI.

History

EFS was introduced in March of 1986 with GL2-W2.4 to replace the System III filesystem. It was deprecated in favor of XFS beginning with the introduction of IRIX 5.3 XFS in December of 1994 and later IRIX 6.0 and 6.1 in March of 1995 with all subsequent versions of IRIX 6.x using XFS.

Specifications

• Block size: 512-bytes
  • Block 0: unused or contains a bootstrap program
  • Block 1: superblock, contains file system metadata
• Maximum file system size: 8GB (224 or 16777214 blocks)
• Maximum individual file size: 2GB
• Number of fixed-files created by mkfs: 9