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The command would be similar to this: nvram boot-device ud:3,\\:tbxiNow this looks a tad bit different then what we typed in Open Firmware, but that's because we have to escape the two backslashes, each with a backslash of its own. Something like: boot-device ud:3,\:tbxi hd:,\:tbxi'ДЄnd now some more fun, there is a Unix script that can be written to enable this, because after all we are only changing a nvram variable.

Type printenv boot-device, and you should see the change displayed already.

Type setenv boot-device ud:3,\:tbxi where the number after the colon corresponds to that partition number we found in step two.

Now type printenv boot-device, which will usually get you output of boot-device hd:,\:tbxi.

Again, if you see this, I have not had this fail yet. If found, it will usually have beside it or something similar. In this list, look for ud, usually below where you see hd ( ud is 'USB Disk,' I presume). In Open Firmware, type devalias, and you should get a list as output. If this step does not work, I have had very limited success getting a machine to boot off USB2. Hold Command-Option-F-F right after the machine is turned on.

Start up the machine in Open Firmware (this is the fun part).

There are other ways of finding this out, but in my case, my disk is disk2s3 (the 3 on the end will come into play soon).

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disk3s9 might be a USB disk with OS 9 drivers that is considered the third disk. That is, disk2s3 is usually for a USB disk with no OS 9 drivers installed that is the second disk disk. I usually find this by going to Disk Utility and looking at the info for the partition on the USB disk with OS X. Connect the drive to your machine, and find out which partition the OS X system is installed on.

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As you know, there are many different ways of getting a system on a USB drive contact me if you have any questions on how to do that, or search for that information. You need a USB2 drive with an OS X system installed (I am using 10.4.3, though any I think will work as far as what the machine can boot).

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Note: As with all hints that have to do with Open Firmware, proceed at your own risk! I have not experienced a problem and I don't see how this hint could render your Mac useless, since the default can always be recovered by resetting the SMU. Without further delay, here's the process to follow.

iMac G5 w/iSight (thanks to the eager user who emailed me).

Machines that I have tested this hint on and made it work are: Thankfully, somewhere about the time the iMac G5 with the ambient light sensor (ALS) was released, Apple tweaked their Open Firmware, which allowed us to boot PowerPC Macs from USB2 drives. Please note: Disk Drill does not provide any option to create bootable CD/DVD drives due to them becoming less popular and accessible in modern computers.First off, I have tried and tried again over the years to boot various PowerPC Macs via a USB2 disk. This ensures the maximum amount of data stays intact during the recovery process, and other background processes or the operating system itself do not overwrite any recoverable pieces of information. Connect it to any Mac, run Disk Drill and use the 'Create Boot Drive' option on the main toolbar.Дisk Drill let's you run all its data recovery algorithms via a bootable Mac USB drive. Make sure you have an extra storage device, which is at least 2GB in size.

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Starting with Disk Drill 3, anyone can create a bootable Mac OS X drive in a matter of minutes. It'll make your Mac boot from USB in just a few clicks. Disk Drill is by far the most convenient and up-to-date macOS bootable file rescue solution.

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Set it aside, calm down and download a bootable data recovery app using any other computer. You can turn your computer off, remove the drive in question from the docking station, do whatever may be required to prevent any further utilization of that drive. The initial recommendation given to anyone who lost important data and would like to proceed with the data recovery is always to stop using the drive where the data was stored as soon as possible.