I'm migrating 2 databases from a cluttered hard drive to a new one I purchased specifically to host these two databases. The databases are roughly equal in size and projected to grow equally. Does it make sense to allocate half the hard drive to each (so now the databases might have 40% unused space instead of the usual 5-10% I keep it at)? Will this prevent fragmentation since the MDF file will be on a continuous block? Or is this a bad idea? Should I just keep my usual buffer and let the file grow in time (OS can manage defrag). thoughts?