... not sure what make of drives you are using ... but some of them draw lots of power (0.8A) ... which the 7020 may not have enough to operate the drive so controler recognizes it ...
... you want to find a 'low power' drive ... (0.5A or lower)
... one quick test is to get a 2.5" drive and a 2.5 to 3.5 cable converter ...
... the notebook drives run with smaller poer requirement ... if it works with a notebook drive then its most certainly a power issue ...
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