Mountain Lion Quicktime AVCHD

When I copy the entire unmodified contents of an SD card containing AVCHD files to my external HDD I can't open the AVCHD movie file using Mountain  Lion and Quicktime.
The open clip window opens and just stays blank. Meanwhile in the background I see a Quicktime error message dialog box saying "The Operation Could Not be Completed"
The files can be seen when using the Show Package Contents option and the files work in other avchd apps like VLC.
I do not experience this problem when I follow the same process but use the Internal solid state drive.
The files on the external hard drive CAN BE opened from an app like Adobe Premier Pro so the actual mts files seem to be in tact and working on the external HDD.
I have tested this on two different external HDD's. Same error on both. 
Thanks in advance for any help or assistance you can provide.
My main concern is that I want to make sure my entire SD card is being properly copied when put on an external HDD so that I know I have a fully working backup of my movie files.

Such = SDHC
Sorry, Apple thought it knew better than I what I wanted to type.

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