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The Series 4 is compact, nearly the same size as an Apple TV.
A newly added SD card slot is a welcome feature for direct sharing of photos from your camera card.
Two USB 3.0 ports grace the back.
Under a snap-off cover, an extra USB 2.0 port and a SATA port for compatible 2.5-inch hard drives await.
A Kingston HyperX USB drive and a Seagate FreeAgent GoFlex hard drive plugged into the top of the Pogoplug simultaneously.
The new Pogoplug is a very functional hard-drive dock, with a small footprint.
Using the iPad Pogoplug app.