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How to mount an IRIX efs filesystem CD-ROM

I have an old Silicon Graphics (SGI) Workstations and a vast number of IRIX CDs which I would like to back up to a hard disk (IRIX was SGI's proprietary OS based on UNIX). IRIX CD-ROM disks use the EFS filesystem using 512 Byte blocks. I am unable to read these CD-ROMS using my Mac and would like to do so.


For your information, I am using a MacBook Pro 13inch Mid 2012 machine, with 16GB RAM, 2.5GHz Intel Core i5 under OS X 10.10.


I have tried the following without success:


  1. Simply inserting the disc in the CD-ROM drive displays the message "Unknown File System".
  2. Using the Terminal application I have tried mount -r -t efs /dev/cdrom /mnt/irix as suggested by the SGI specialist page nekochan.net http://www.nekochan.net/wiki/Mounting_IRIX_CDs_on_Non-IRIX_Systems without success.
  3. The same page also suggests that the following may work: sudo mount -t efs -r /dev/scd0 /media/cdrom but I then seem to be missing a large number of files as the following message suggests:

root# sudo mount -t efs -r /dev/scd0 /

mount: exec /Library/Filesystems/efs.fs/Contents/Resources/mount_efs for /: No such file or directory



This error message would seem to suggest that the efs filesystem has existed. I am missing something? Does anyone know where I might get these relevant files?


Many thanks for any help or suggestions you may have.

MacBook Pro (13-inch Mid 2012), OS X Yosemite (10.10), 2.5 GHz, 8GB DDR3 1600

Posted on Aug 3, 2015 10:48 AM

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How to mount an IRIX efs filesystem CD-ROM

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