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I watched the video in reply 44 above and could not discern whether or not this device creates some kind of "bridged volume" (using all 3 drives at once), is some kind of "RAID", or something else.

The guy talking says the drives can be "hot-swapped", which leads me to think it's just some kind of "JBOD" bunch-of-drives that mount individually via a shared firewire connection. I could be wrong.

If I had this thing in my hands, I'd do this:

1. Take one of the drive cartridges OUT of it.
2. Take the ATA drive OUT OF the cartridge.
3. Put the ATA drive into a USB3/SATA docking station
4. See if it will "mount up" in the finder.

IF the drive "mounts right up", I'd just copy what I needed from it to another drive.
Then I'd repeat with the second of the three drives, etc.

If the drive WILL NOT show up on the desktop, I would proceed no further. I'd put it BACK INTO the Glyph enclosure, and seek to get that thing connected.

But why, why, WHY is this topic dragging on?
All the OP needs to do is get the appropriate cables and try the connection.

OP:
Haven't you got this figured out YET...?
 
But why, why, WHY is this topic dragging on?
All the OP needs to do is get the appropriate cables and try the connection.

OP:
Haven't you got this figured out YET...?

Because OP is a protagonist who is paranoid about his precious data, and we the observers are just plain curious....

According to the sales materials and user manual, GT 103 uses the common SATA II drives in JOBD configuration.
There are no obstructions to transfer the drives to an USB enclosure, which has better speed and connecting options.
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Put the ATA drive into a USB3/SATA docking station
Little nitpick here - since this thread has been dragging on and getting into details more than is reasonable here:
"ATA", used interchangeably with "IDE", often refers to the particular 40-pin connector used on (older) hard drives - which is different from modern "SATA" connectors.

Confusing these two might lead to purchasing a wrong adapter / dock.

USB2 speeds will certainly be sufficient for a one-time transfer of old data to another volume.
If the drive WILL NOT show up on the desktop, I would proceed no further.
It should be noted NOT to "initialise" the drive if/when prompted by the operating system in this case. I have seen such prompts when connecting a drive that couldn't properly be recognised as a Mac volume.
it's just some kind of "JBOD" bunch-of-drives that mount individually via a shared firewire connection
Even if the external enclosure only presents them as a physical JBOD to the system, they could still be formatted as a software "RAID" in Disk Utility.
 
I gotta say, well put. SATA is not IDE/ATA. The point about a software raid makes sense, although, I’ll not sure why you’d buy an enclosure who’s claim to fame was easy hotswapping of drives and then use a software RAID solution. I know in hardware raids, they’re designed to rebuild if you replace a drive, but something like SOFTRAID? With only 3 drives? I suppose it’s possible.
 
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