Hi folks. Late 08 MBP(Yosemite) to new 16 iMac(Sierra) Trying to manually transfer files with Apple support on screen share didn't work out after hang up. -I first bought Thunderbolt cable(2m) in the attempt to target disc mode. MacBook only showed "Y" shaped symbol(2 = 1 box with circle in middle). Plus, no disc showed up on iMac. -Then, we skipped the migration assistant and shot for sharing "Back to My Mac" procedure. We got that to work until iTunes music folder(near 300 songs), got about 25% transferred***Hung up with Apple care here*** 10mins later, transfer then failed. Which it showed it was estimating 1hr 30mins to finish. -My question is: does anyone know the compatibility on Thunderbolt between these two on why the target disc mode has that symbol and not the lightning bolt symbol? Or, is there another way I could use the thunderbolt cable in another fashion to help with the unsure Back to my Mac finish? Thanks, everyone in advance. PS: Migration assistant was only bypassed at first due to not wanting entire MacBook to transfer to iMac.