“Rotating memories (that is, computer memories that use a rotating platen, such as hard drives, CD-ROMs, and DVDs) are on their way out, although rotating magnetic memories are still used in server computers where large amounts of information are stored. [By 2009.]”

Ray KurzweilThought Leader

Inventor, futurist and author of The Age of Spiritual Machines

In 2009 hard drives were still the dominant consumer and enterprise storage medium and optical discs (CD/DVD/Blu-ray) were in mass use; flash-based SSDs were a small, expensive niche. Rotating storage was not 'on its way out' by the target date.