[OpenIndiana-discuss] USB 3 port with USB 3 memory stick copying 4.1MB/s

[Peter Tribble]

On Thu, Apr 23, 2026 at 10:21 AM russell via openindiana-discuss <
openindiana-discuss at openindiana.org> wrote:

> Hi
>
> I plugged a Sandisk USB3.0 memory stick into one of my USB 3.0
> interfaces and started to copy some files but am only getting 4.1MB/s.
>

How is the memory stick formatted? If it's PCFS (aka FAT). which is the most
likely option, then you're going to get awful performance, because our PCFS
implementation is pretty poor.


> When I copy the same files over the network I am getting over 100MB/s so
> I do not think this is a disk i/o issue.
> Checking the performance of the USB 3.0 memory stick indicates that I
> should be getting 10-15MB/s
> Any suggestions.
>
> Kind Regards
>
> Russell
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-- 
-Peter Tribble
https://www.petertribble.co.uk/ - https://ptribble.blogspot.com/