>No Not tested With SSD yet because my HDD performance is still untilised. As I told HDD is just showing 20% -40%, Means there is ample room (60 %) in performance of my HDD itself.
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>I am just converting file Type A to B using some Third party DLL.(PS2PDF.DLL) The Third Party DLL supports up to 23 Threads.
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unscientific and probably false argument.
as you don't describe the measurement dimension, first guess is saturation bandwidth - not too bad if it is based real disc data, lousy if based on interface. Even with disc based data read for each disc from disc, HDD might block due to head movement where SSD will deliver and saturate CPU.

>I a Cursor I take one file a Input file and other as Output and just convert using the DLL and Scan Endscan code. Nothing complicated.

but stupid if done on the same disc and aiming for performance - buffering helps a lot, but is only band-aid for design not thought through.