I write: 
>   The 'exact' limit would be 4294967296 bytes (0x100000000) due to the 32-bit
> byte offset used by the disk driver.  That would be 8388608 (0x08000000) disk
                                                              ^^^^^^^^^^^^
  Ooops - make that (0x00800000).
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Michael L. Hitch                        mhitch@montana.edu
Computer Consultant,  Information Technology Center
Montana State University, Bozeman, MT     USA