Sanlitun

macrumors 6502
Original poster
Sep 19, 2014
497
443
127.0.0.1
Anyone else experiencing very slow performance from external USB 3 storage? I know the release notes specify issues with USB 2 but say nothing about this.

I have a SSD in an external USB 3 enclosure that I get 400 MB/s on my Macbook Pro but now on my nMP
I am lucky to get 40 MB/s.

Anyone else seeing this?
 

leventozler

macrumors 6502
Feb 18, 2009
319
117
I get ~140MB write 360MB read (couple years old SSD)

Checked another external SSD drive connected to a Trust USB 3.0 Hub and got ~36MB read/write. Check System Information > USB and make sure it's listed as USB 3.0 device.
 
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SG-

macrumors regular
Jun 8, 2015
107
65
the release notes mention there's USB issues for last two builds.
 
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MikhailT

macrumors 601
Nov 12, 2007
4,535
1,219
No problems here with USB3 dual-bay chassis (Oyen Digital RAID v2), 350MB+ on both read/write.
 
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