I had to wait about 5 years before hard drives (HDs) became affordable enough to begin moving off of floppies. During this time, I remember my desire for an HD being based on convenience. All the software I used was designed to run fine from floppies, but an HD offered much faster loading plus access to all those applications without swapping floppy disks and (sometimes) rebooting. The combined speed and ready access translated to the convenience that made an HD highly desirable for me.
But many mainstream computer users weren't focused on running lots of different application like I was. They just needed one or two applications that were critical. The implication being that unless those applications required an HD, the HD would not be worth the significant added expense. I'd like to know what early, popular PC applications fell into the category of requiring an HD, based on the sheer size of the code and/or data they needed? Also is there evidence of any application being a "market driver" in the adoption of HDs?
Out of the triad of word processing, spreadsheet, and database as the early "sweet-spot" for serious PC applications, it seems obvious that a database would be the most likely to require and benefit from an HD. So, I'd ideally like an answer that challenges or confirms that assumption by citing specific popular applications of the time.