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Mike, Mac Medic
Category: Mac
Satisfied Customers: 8996
Experience:  Over 20 years IT experience with Apple computers in publishing, marketing and design.
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New iMac27 wont connect to 2008 iMac 20 in Target mode via

Customer Question

New iMac27 won't connect to 2008 iMac 20 in Target mode via Thunderbolt adapter Firewire 800 cable
Submitted: 4 years ago.
Category: Mac
Expert:  Mike replied 4 years ago.
Unfortunately the Thunderbolt adapter is a unidirectional bridge from Thunderbolt to FireWire that requires a computer host with software drivers to interface with the controller it contains. Inverting it and attempting the connection in the opposite direction will not work.
Expert:  Mike replied 4 years ago.
Sorry there are varying opinions on this I see now. That is the official answer but some say it works. Are both Macs Mountain Lion?