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A spin-stand level dynamic read-back microscopy (DRM) technique offers ease of use and full compatibility with standard media parametrics testing. We designed and implemented a DRM tester based on a LeCroy DDA5005 oscilloscope and a Guzik spin-stand. Using a DRM, we investigated the effect of magnetic exchange coupling on side erasure of CoCrPt-SiO PMR media. Exchange was controlled by varying the oxygen partial pressure during deposition. The paper show tracks after a progressive edge-trimming from the both sides using a low DC-negative erase current.