Comment 7 for bug 467223

It also happens with Maverick final. I only tried with a Kingston DataTraveler G2 16GB USB memory stick.

Here's what the dialog window shows:

Unable to stop drive

Error detaching: helper exited with exit code 1: Detaching device /dev/sdb
USB device: /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-4)
SYNCHRONIZE CACHE: synchronize cache(10): Fixed format, current; Sense key: Key=9
 Additional sense: Logical unit not ready, cause not reportable
  Info fld=0x0 [0]
FAILED: No such file or directory
(Continuing despite SYNCHRONIZE CACHE failure.)
STOP UNIT: start stop unit: transport: Host_status=0x07 [DID_ERROR]
Driver_status=0x00 [DRIVER_OK, SUGGEST_OK]

FAILED: No such file or directory