Final answer:
The statement is false; other file organization methods like indexed and direct file organization can also be used with tape and disk storage, not just sequential file organization.
Step-by-step explanation:
The assertion that sequential file organization is the exclusive method easily stored on both tape and disk is False. While sequential organization aligns well with these media, particularly with sequential tape reading, it isn't the sole fitting method. Other file organizations, like indexed and direct organization, are viable for tape and disk storage, albeit with distinct performance traits and requisites. These alternatives provide flexibility in structuring data, accommodating diverse storage needs beyond sequential access.
Hence, while sequential organization remains advantageous, it is essential to recognize the adaptability of other file organization methods for effective utilization of tape and disk storage, each offering unique advantages and considerations.