I doubt you will find a module to allow you access to the correct api's to read disks in their raw format. I haven't looked, so I may be wrong on that.
As you already have a utility to do it, I would suggest the easiest way is to persue your notion of forking dd and reading it that way. Instead of trying to read the whole thing into memory as a line, use the method of setting $/=\nn, to control the amount you read from the pipe to dd.
See perlman:perlvar, search for $INPUT_RECORD_SEPARATOR, and read the second piece of sample code and its surrounding paragraph for a full explaination.
Out of interest, is 'dd' the MKSToolkit version?
Well It's better than the Abottoire, but Yorkshire!
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