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Date:      Sun, 22 Jul 2012 23:32:32 +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.2.00.1207222331130.4614@wojtek.tensor.gdynia.pl>
In-Reply-To: <1342992043358-5729028.post@n5.nabble.com>
References:  <1342992043358-5729028.post@n5.nabble.com>

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> which actually works with FreeBSD just ripped from
> package! (normal _empty_ FAT filesystem, no
> garbageware added, no need to format).

zero difference. newfs_msdos take a moment.

> It actually bounces from 40MB/s limit when reading
> from it.
>
> Writing is about 18MB/s.
>
> Device is supposed to be "467x" which should
> be about 70MB/s.

don't treat all advertised data seriously

>
> And USB 2.0 hard limit is 60MB/s.
>
> Wouldn't be nice to squeeze few additional
> MB/s?

how did you measured it.

dd if=/dev/da0 of=/dev/null bs=64k
?

dd if=/dev/zero of=/dev/da0 bs=64k

via msdosfs
via mtools

?




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