New mac won't allow me to add files to my old external hard drives.

Jeremy Dooley

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Jan 3, 2015
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Hi there,

I've been trying my hardest to figure out how to do this without having to delete all of my files and reformatting my external HD, but I haven't been able to find a solution. Maybe I'm not using the right keywords when I search for solutions?


Anyway...


I recently purchased a new MacBook Pro, and have since been unable to transfer any files (small 1mg files to 3gig files) from this new Mac, to any external HD's (that worked fine on my previous/other Macs'). However, I am able to drag files from the external HD to my mac.

Transferring files to a small USB works without an issue.


How do I fix this, without deleting/wiping the external HD so I can transfer files onto it?


Thanks so much for any help!