The 60D unlike it's predecessors uses an SD/SDHC card I'm not familiar with the "Promaster" brand of memory card but what all SD cards has is a little lock on the side it's a little white switch that needs to be slide forward to the top of the card to unlock. Once done the card should perform the same way as a Compact Flash card.
Picture here
If this is not the problem I would suspect a faulty card
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