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The Buffalo HD-PCFU3-C external HDs are housed in solid aluminum cases and equipped with a high-speed USB 3.0 interface. The latter might be used both for data transfer as well as charge-in purposes; put it otherwise, the user will be saved from the necessity to buy an additional AC adaptor.
Pricewise, the cheapest solutions are 500 GB HD-PCF500U3-BC and HD-PCF500U3-WC with the price tag of $90. The HD-PCF1.0U3-BWC and HD-PCF1.0U3-BBC of 1 TB capacity will cost about $110, whereas their senior companions, the PCF2.0U3-GBC and HD-PCF2.0U3-GWC of 2 TB capacity, will go as high as $165. Shipping is to start in early January 2015.