"da0: 40.000MB/s transfers" What was rationale behind pegging USB 2.0 at 40MB/s?

Wojciech Puchar wojtek at wojtek.tensor.gdynia.pl
Sun Jul 22 21:32:37 UTC 2012

> 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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