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** Fixed at ArcGIS 8.2 **
Images imported into an ArcSDE Geodatabase using the sderaster command or the ArcGIS GUI tool display as not being compressed in ArcGIS Desktop.
This is a known issue. The ArcGIS GUI does not list ArcSDE raster images as compressed if images are compressed using the LZ77 compression format.
Use the 'sderaster -o list' command at the sde command prompt to verify whether or not the raster data is compressed.