The raster package in R has the possibility to write a specific format using the function [writeRaster][1]writeRaster. You can use for example GTiff. Here the short list of supported data formats. I assume you need a multiband format.
Type Provider extension Multiband support
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raster Native .grd Yes
ascii ESRI Ascii .asc No
SAGA SAGA GIS .sdat No
IDRISI IDRISI .rst No
CDF netCDF .nc Yes
GTiff GeoTiff .tif Yes
ENVI ENVI .envi Yes
EHdr ESRI .bil Yes
HFA Erdas .img Yes
Huck [1]: http://www.inside-r.org/packages/cran/raster/docs/writeRaster
