1) Primary storage typically refers to random access memory (RAM), while secondary storage refers to the computer's internal hard drive. RAM, commonly called "memory," is considered primary storage, since it stores data that is directly accessible by the computer's CPU. Difference between Primary storage and secondary storage. Primary memory is the main memory (Hard disk, RAM) where the operating system resides. Secondary memory can be external devices like CD, floppy magnetic discs etc. secondary storage cannot be directly accessed by the CPU and is also external memory storage.

2) Hard disks is a magnetic disk on which you can store computer data. Areal density is a measurement of the amount of data that can be stored on a given unit of physical space on storage media. It is most frequently measured in gigabits per square inch and used to describe hard disk drive capacity. Some industry professionals argue that areal density steadily increases over time. A cylinder is any set of all of tracks of equal diameter in a hard disk drive (HDD). It can be visualized as a single, imaginary, circle that cuts through all of the platters (and both sides of each platter) in the drive.

3) Optical disk is is any media read using a laser assembly. The most common types of optical media are Blu-ray, CD's, and DVDs. CD's and DVDs store data in lands and pits. The bits are read by the disc drive that uses a laser beam to distinguish between the lands and pits based on the amount of scattering or deflection that occurs when the beam of light hits the surface of the disc.

REFLECTION

this chapter explains briefly about storage disk. From this chapter i learnt that there are two types of storage which is called primary storage and secondary storage. Example of primary storage is Memory, RAM and hard disk. Meanwhile, example pf secondary storage is CD and floppy magnetic disks.