You can now find "Arc" complete ETOPO2v2g grids in folder:
http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO2/ETOPO2v2-2006/ETOPO2v2g/raw_binary/

(You can easily import these grids into ArcMap):
http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO2/ETOPO2v2-2006/ETOPO2v2g/raw_binary/ETOPO2v2g_f4_LSB.zip 
http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO2/ETOPO2v2-2006/ETOPO2v2g/raw_binary/ETOPO2v2g_f4_MSB.zip