** Fixed at ArcGIS 8.2 **
ArcToolbox or ArcCatalog was used to load a raster dataset into a geodatabase. All the default parameters were used, which should apply an LZ77 compression to the raster as it is loaded; however, the Properties dialog box doesn't show that compression has been set.
This is a known issue with ArcGIS 8.1.
There is no workaround for this issue.