I have a drobo with 16tb available. I'd like to make a sparse disk image on it so I can encrypt everything on the drive. When I make one in disk utility, it takes a LONG time-- as in, it's been going at it for two days now. The file it's creating also seems to be growing (where as sparse image files are only supposed to be as large as the files they contain, and grow to match). Is there an upper limit on sparse image size, and this is never going to complete? Or, something else going on here I'm not understanding? Thanks!