Linux - Embedded & Single-board computerThis forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.
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You're right - usb2 is slower. But implementations vary greatly and some chipsets have unseen bottlenecks. If you have a Pi, you should try a hdparm and a dd test and take the slower result.
But as long as it's faster than your network, does it matter? USB2 did at least 12MB/S on anything I have tried (Massive copies of files from disk A to disk B on various motherboards back some years for a job I had). That would handle a 100Mb/S network connection.
If storage performance is of concern, go for one of the boards with SATA connector, like the Cubietech Cubietruck or the Olimex OlinuXino Micro A20.
But of course you should consider the advice from business_kid and determine where your bottlenecks are.
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