How to make hdiutil create segmented images?

The problem: I need to make an image of my data on a UFS formatted drive. The folder is 16 Gb. The image file size is limited to 4Gb. I need to make hdiutil make an image segmented into parts less than 4 Gb, but when I give option -segmentSize 4Gb I get an error: -segmentSize ignored since -srcdevice not specified. Well, formally it's a warning, because hdiutil proceeds to create an unsegmented image and cr@ps out at 4 Gb.
I can't image the whole device - I don't have enough space. What can I do?
Vladimir

Hi Vladimir,
   You can extract the tarball pieces by putting them together with the "cat" command and using "tar" to unpack that. The inverse of Andy's command is:
cat image-tgz* | tar -zxf - <dir>
The "-z" option of "tar" does the same thing as using gzip in the middle of the pipe and can be used in creating the pieces as well. A word of warning: I used GNU's textutils in testing this. I believe that Apple BSD versions of split and cat are the same and they should certainly work together similarly but I haven't tested that yet.
   I don't believe that hdiutil reads and writes to STDIN the way UNIX tools do. You might be able to use named pipes to "fool" hdiutil into "believing" that it's working with files.
Gary
~~~~
   In matters of principle, stand like a rock;
   in matters of taste, swim with the current.
         -- Thomas Jefferson

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