3dchris wrote:. BTW, does the 512/2k jumper need to set so that CD's are read at 512? Maybe this is the problem? Do other DVD drives have this jumper as well, or is it ONLY on this one specific DVD drive model and manufacturer?
PymbleSoftware wrote:My understanding right or wrong is that the SGI (PROM or IRIX) device drivers need 512 byte blocks and it is not specific to that drive, as other drives also have a 512 byte jumper.
PymbleSoftware wrote:I also suspect it is unrelated to media itself.
jan-jaap is the one who clued me into the bootable DVD, but as mentioned you'll need one of the slot-loading Pioneer DVD-ROM drives.The 512byte jumper on the Toshiba drives only works when there's a CD disk in the drive - if you insert a DVD disk in a Toshiba drive the firmware overrides the jumper and switches the drive to 2048 byte mode. The Pioneer drives comply with the 512 byte jumper position regardless of the disk type.jan-jaap wrote:Almost. Apparently this mode setting is different between CD-ROMs and DVD-ROMs. If you make a 1:1 copy of a CD-ROM on a DVD-RW disc and attempt to boot from that, it fails. A drive like the slot-loading Pioneer 16x SCSI DVD-ROM has a jumper to set DVD to 512byte as well, and then you can boot from an IRIX DVD. You can make your own DVDs by merging the contents of a bunch of CD-ROMs and boot from that too. This even works for IRIX versions that know nothing of DVDs, like IRIX 6.2, because it's just another removable, 512byte blocksize medium. As long as the disklabel is similar to an IRIX CDROM and the filesystem is EFS, it works fine.
How long are the cable(s)? The UltraSCSI bus on the Octane has an overall cable length restriction of 1.5 meters.3dchris wrote:I have brand new SCSI cables
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