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To:	cygwin AT cygwin DOT com
From:	Rob Stevens <robs AT cruzio DOT com>
Subject:	Very slow i/o to external hard drive's HFS+
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Message-ID:	<78677a3e-7f0c-d9e0-8542-6ab44ae5fe75@cruzio.com>
Date:	Wed, 16 Sep 2020 11:16:38 -0400
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Hello

I have a removable hard drive sporting an HFS+ connected to a USB3 port.
The drive is a Seagate Slim Line 2T.
I am using a driver from Paragon Sofware to write/read from this drive.
I am running Windows10 build 19041.508 (ie up to date)

Writing to this file system using the unix cp command is incredibly slow:

cp my_file /cygdrive/h/some_destination
The same write, using copy paste in Windows Explorer is much faster.

I have not precisely timed it, but it is way more than an order of magnitude
faster (a 1G file took approx 10 mins: the graphical display shows just
a few seconds).

(In Windows Device Manager I have the policy for the drive set to be
"Better Performance"  and not "Quick Removal" -- apparently
the latter can lead to dramatic degradation in performance).

Can anyone suggest what might be the cause?

Rob Stevens
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