Re: 003 with new iMac connection
USB to Firewire? You cannot go from USB to Firewire, no way possible. But you can go from Thunderbolt to Firewire.
And a Quad interface drive does not provide protocol conversions between any of the IO ports, it's just a dumb drive.
This has been discussed here many times (you should search before posting) ....
Use an Apple Thunderbolt 3 to Thunderbolt 2 adapter and then an Apple Thunderbolt to Firewire 800 adapter, and then a third party Firewire 800 to 400 adapter or cable.
Older OWC Thunderbolt 3 docks also have a Firewire 800 port.
And while at it take all your old HDD drives, and ideally copy them to the internal iMac SSD. Or if there is not space then the external USB 3.1 SSD drives (like a Samsung T5) or NVMe drive (Samsung X5 or Sonnet Fusion SSD) and throw those old quad interface HDD in the trash.
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