raw devices

hi, anyone knows what major products uses the raw device to store their
data?

for a filter driver below the file system, does it attach to the raw devices
or the floppy/disk devices?

Ho Mun Chuen
xxxxx@pmail.ntu.edu.sg
@@ “Not everything that counts can be counted;
<” )~ and not everything that can be counted counts"
//\ … Albert Einstein