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USB-C to FireWire 800 adapter doesn't exist, make our voices heard for one. - Gearspace.com
Connect old Firewire hard drive to modern USB-C Mac
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Amazon.com: 4 Pieces Firewire IEEE 1394 6 Pin USB Adapter Female F to USB M Male Cable Converter Firewire 6 Pin to Male USB 2.0 Adapter for Printer, Digital Camera, Scanner, Hard Disk : Electronics