Bit density is more in which device?
1. DVD
2. Magnetic tape
3. Magnetic disk
4. Compact disk
The correct answer and explanation is:
The correct answer is 3. Magnetic disk.
Explanation:
Bit density refers to the amount of data that can be stored in a given area of storage medium. Higher bit density means more data can be packed into a smaller space. Among the listed options, the magnetic disk typically has the highest bit density, making it the most efficient in terms of storage capacity per unit area.
- DVD (Digital Versatile Disc): A DVD stores more data than a compact disc but has lower bit density than a magnetic disk. DVDs use a laser to read and write data on a surface, with the data encoded in the form of pits and lands. The bit density of DVDs is higher than that of CDs, but it still falls short compared to magnetic disks.
- Magnetic tape: Magnetic tapes are used for sequential access data storage, typically for backup and archival purposes. Though tapes have a higher capacity than DVDs in some cases, they have a lower bit density. The data is stored along the tape’s length, and while high capacity is possible, it does not allow for the same compact storage as magnetic disks, where data can be accessed randomly.
- Magnetic disk: Magnetic disks, like hard drives or floppy disks, store data using magnetic fields. The data is written and read by a read/write head that moves over the spinning disk. Magnetic disks have a very high bit density because they use finely controlled magnetic particles arranged on the disk surface. Modern hard drives can achieve multi-terabyte capacities, packing a tremendous amount of data into relatively small physical spaces.
- Compact disk (CD): A CD has lower bit density compared to the other options. CDs store data using a laser to read microscopic pits in a spiral pattern. While they were revolutionary at the time of their release, their storage capacity is much smaller than that of DVDs and magnetic disks, with the highest bit density being in the magnetic disk category.
Thus, the magnetic disk stands out for its ability to store more data in a smaller physical area compared to the other media listed.