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In the MacOS open Disk Utility and repair permissions. I had similar USB problems with 3188 after the Mac Upgrade to 10.4.9. Repairing...
Using either 3186 or 3188 I had similar recurring problems with USB connected drives and printers (not being released by the MacOS to the...
Ditto on no recognition of external drive with 3120 I've experienced the same problem - upon updated to 3120 external USB drive doesn't show...