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Try the Copy Raster tool. It's converted things to GRID for me in the past quite reliably. http://resources.arcgis.com/en/help/main/10.1/index.html#//001700000094000000
Check out Earth Explorer. You can search many different datasets depending on avaliablity for certian locations.
Here's a fuller answer about the synthetic aperture radar (SAR) data available from the Alaska Satellite Facility at no cost to users. The datasets include Seasat (1978 data newly processed in 2013), InSAR, PALSAR (including radiometrically terrain-corrected products), RADARSAT-1, ERS-1, ERS-2, JERS-1, UAVSAR, AirMOSS, AirSAR, and more. SMAP data will ...
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