Given,
- Number of surfaces = 24
- Number of cylinders = 14,000 ( think it like total number of tracks )
- sectors per track = 400
- Data density or Each sector contains data = 512 Bytes
Total capacity of the disk = Total number of tracks * Number of sectors per track * data in each sector * Number of surface
= 14000 * 400 * 512 * 24
= 68.80 * 109 Bytes
Then maximum number of bytes that can be stored on this disk is = 68.80 * 109 Bytes.
Which match with option C .