Chapter 3 Storage Devices and Media

Backing up refers to copying files or data into a different medium in case of damage or loss of original copy.

To safeguard against loss of data.

To safeguard against damages caused by hackers.

In case files need to be sent elsewhere, to protect the original format of files.

Backups can be stored online for easy access.

- Holds data magnetically.

- The surface area of the media is magnetised so that it can hold bits of data.

- The device that reads media can also read the bits held on the surface area

- used in applications where batch processing is used.

- used as a backup media where vast amounts of data need to be stored.

- used in long-term archiving of data, they have huge data storage capacities and are known to be very stable.

They are generally less expensive than hard disk drives.

It is a very robust technology.

They have a huge data storage capacity.

The data transfer rate is fast.

Prolonged data access times (uses serial access).

When updating, another tape is needed to store the final updated version.

They are affected by magnetic fields, a strong field can corrupt data stored on the tape.

To store the OS, systems software and working data/files.

Storing applications files.

Used in real-time systems and in online systems.

Used in file servers for computer networks.

They have a very fast data transfer rate and fast access times to data.

They have a very large memory capacity.

It can be fairly easily damaged.

They have many moving parts which affect overall reliability.

Their read/write operation can be quite noisy when compared to solid-state drives.

Can be used as a backup system to prevent data loss.

It can be used to transfer data/files/software between computers.