At this time:

There are UHS-1 "SDHC compatible" cards that claim read speeds of 90MB/s
but you need custom hardware to get speeds above normal SDHC.

25MB/s is the max write speed for SDHC.

Class 4 is the max for micro/mini SDHC.

There are some 15MB/s usb sticks
http://usbspeed.nirsoft.net/usb_drive_speed_summary.html?o=11

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https://bugs.launchpad.net/bugs/500069

Title:
  USB file transfer causes system freezes; ops take hours instead of
  minutes

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