Date: Mon, 23 Jul 2012 09:41:18 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Jakub Lach <jakub_lach@mailplus.pl> Cc: freebsd-questions@freebsd.org Subject: Re: "da0: 40.000MB/s transfers" What was rationale behind pegging USB 2.0 at 40MB/s? Message-ID: <alpine.BSF.2.00.1207230940390.7616@wojtek.tensor.gdynia.pl> In-Reply-To: <1342992043358-5729028.post@n5.nabble.com> References: <1342992043358-5729028.post@n5.nabble.com>
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> And USB 2.0 hard limit is 60MB/s. i have never seen USB 2.0 exceeding 35MB/s write and 40MB/s read. even when connecting SATA disk over USB-SATA bridge. 60MB/s is wire speed. USB have enormous protocol overhead.
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