liveusb-creator error

[Steven Stern]

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What does this error mean?  The files seem to be happily copied onto my
USB key, but....

f12.iso selected
Verifying filesystem...
Verifying ISO MD5 checksum
ISO MD5 checksum passed
Extracting live image to USB device...
Wrote to device at 9 MB/sec
Creating 471MB persistent overlay
Setting up OLPC boot file...
Installing bootloader...
Assertion (head_size <= 63) at dos.c:639 in function
probe_partition_for_geom() failed.
LiveUSB creation failed!
Assertion (head_size <= 63) at dos.c:639 in function
probe_partition_for_geom() failed.
- -- 

  Steve
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