Reliability
In the field, the FileWare drives proved to be somewhat unreliable. In early 1984, Apple introduced the Lisa 2, which used a single 3½ inch Sony floppy drive in place of the two FileWare drives of the original Lisa. A free upgrade was offered to Lisa 1 owners. The Macintosh was also introduced using the Sony floppy drive.
Read more about this topic: Apple File Ware