Filename
filename.RdGet the filename of a Raster* object. You cannot set the filename of an object (except for RasterStack objects); but you can provide a 'filename= ' argument to a function that creates a new RasterLayer or RasterBrick* object.
Examples
r <- raster( system.file("external/test.grd", package="raster") )
filename(r)
#> [1] "/tmp/RtmpefBMx3/temp_libpath6da8028003bc9/raster/external/test.grd"