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Date:      Mon, 23 Jul 2012 09:41:18 +0200 (CEST)
From:      Wojciech Puchar <>
To:        Jakub Lach <>
Subject:   Re: "da0: 40.000MB/s transfers" What was rationale behind pegging USB 2.0 at 40MB/s?
Message-ID:  <>
In-Reply-To: <>
References:  <>

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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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