I use an LG DVD player with similar function, it will not 'see' an external (powered) USB HDD.
Your machine may be more clever - try it - I don't think it will hurt anything.
The following is anecdotal......
I bought another HDD Media Player this week which works well, I can insert a flash card (4 types) and transfer files from the card to the HDD. You can buy such media players (without HDD) for under $50 from China then install a 2.5" HDD costing around $100. A 320GB HDD will hold many DIVX (ETC.) and will also play JPG photos etc. These players also act as a portable HDD for all file types.
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