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Please run a test for me if you have Lion running under VMware


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I am running into an artificial ceiling on 10.7.1 Lion running as a guest inside VMware which limits my USB mass storage transfer speeds to ~17MB/s.

 

It should be ~35MB/s and is not hardware related because the same USB mass storage device gets 35MB/s when I bypass Lion and connect directly to Windows 7 using this same hardware.

 

The Lion 10.7.1 Guest running is running inside Vmware Player x64 Windows 7.

 

Please run this test:

 

1) Open a terminal

2) Type the following,note the # of your spare USB disk

 

diskutil list

 

3) Replace N with the # of your spare USB disk for testing and type the following.

 

iostat diskN 1

 

You should see a new line appear every 1 second

 

4) Copy a large file, say 500MB or more onto your USB drive.

 

5) Write down the MB/s number in the first terminal window, which will go from 0MB/s to maybe 17MB/s or maybe up to 35MB/s.

 

thank you

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