Reading and writing a magnetic disk or optical disc. The most time-consuming part of the operation is moving the read/write head. The access time is the average of the time it takes to position the head over the requested track. See defragment and access time.
It is not cost effective to upgrade older PCs (clock speed and disk access times would still be slow), so a sizeable investment in newer AT or 386 technology, plus the CD product itself must be made whether the application is standalone or networked.