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It's infuriating - sometimes OSX decides to mounts external drive as low speed USB and I only find out when it tells me that the copying process will take hours.

Windows always warns if something like that happens. Can I somehow get OSX to tell me if it managed to establish proper high speed USB2 connection?

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migrated from serverfault.com Jan 25 '10 at 18:24

This question came from our site for system and network administrators.

You can see the device speed in the System Profiler. Apple menu -> About This Mac -> More Info... -> USB -> click on your drive in the list. In the lower pane you'll see a bunch of info about your drive, one of which will indicate the speed of the connection to the drive.

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You can also run "system_profiler" on the command line or from a script. – Gerald Combs Jan 25 '10 at 17:04

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