Hi,

Can someone please recommend some (free?) software that would allow me to 
assess read and write speeds for various disks (e.g., hard drives, SSDs, flash 
drives)?

Alternatively, are there some simple commands that I can give in the Terminal 
app?  At one time, I believe someone gave me such a command, but unfortunately 
I have long ago forgotten it.  I think the "write" part of the test involved 
writing a large amount of stuff to /dev/null.

In case anyone is interested in the background, I am hoping to use a pair of 
PCIe cards to upgrade a mid-2012 Mac Pro by adding some external USB-3 ports 
and some internal SATA III ports.  I wanted to assess "before and after" speeds.

Thanks,

Gregg

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