Have you verified that the CD can be read by any system? I do not think it is a 100% check, as it is not booting, but can a PC read the CD?
Seems very strange that three systems cannot read the disk.
And, also, I would recommend verifying the firmware levels of the systems and the devices. The easiest way is to probably download the .iso image and burn that to a CD - except you cannot read the CD - chicken/egg problem. So, burn the CD and then ftp the files to an AIX system. There is also a README file to explain how you can run the commands and queries from a command line.
Quicklink via vgBookmarks vgBookmarks->Downloads->Maintenance
Microcode update files on CD-ROMp.s. There seems to be two .iso images. Probably you need the:
io_image.iso: Created May 07, 2008
I/O Microcode Update Files and Discovery Tool CD-ROM image