GOOD NEWS
My Adapter setup works with the 128GB mSATA SSD as an external FW400 drive.
- mSATA to 2.5" IDE Adapter (red PCB below)
- 2.5" IDE to 3.5" IDE Adapter (green PCB below)
- IDE to FW400 interface (gutted years ago from an old ext. FW drive, and confirmed working with my spinner IDE drives)
- FW400 to FW800 adapter
- FW800 to ThunderBolt Adapter (Apple branded, and confirmed to work with my modern iMac's Time Machine drive)
All jumpers are removed so the drive operates as MASTER.
I was able to mount the SSD in MacOS Mojave's Disk Utility, connected to my late-2015 27" 5K iMac via FW400 to FW800 Adapter connected to FW800 to ThunderBolt Adapter. I was able to format it MacOS Extended Journaled with Apple Partition Map (GUID is only for Intel Macs). It says 127.67GB available.
(Why did I format it on my modern Intel iMac instead of my G4 Cube? Because it wouldn't mount in OS X Tiger on my G4 Cube. See below.)
MORE GOOD NEWS
If I connect it to my G4 Cube and boot into OS 9, the drive appears on the Desktop. Intech Hard Disk Speed Tools also sees it just fine.
(As you may expect, it plugs directly in with the FW400 cable. No need for FW800 or TB adapters.)
BAD NEWS
If I then boot into OS X Tiger 10.4.11, Disk Utility cannot see it, TechTool Pro 4 cannot see it, Carbon Copy Cloner 3.2 cannot see it, and Finder windows don't show it. If one argues Tiger can't see it because I formatted it on my Intel iMac, how then can OS 9 see it?
After rebooting into OS 9, it threw an unrecognized disk dialog at me, so I allowed OS 9 to initialize the SSD, and then it mounted fine. It was after that I made the screen photo above. But when I then rebooted into Tiger, Tiger still cannot see the drive! Ack!
What must I do so that OS X Tiger can see it?