Disadvantages of computers:
1. Computer is highly dependent on the quality of input data fed to it. Though computers are very fast in tasks that are pre-programmed, it lake the ability of human brain to detect and correct errors that it is not specifically programmed to do.
2. The task of programming a computer for a computer application is very costly and time consuming. This reduces the utility of computers for applications that are non-repetitive.
3. Computer systems are rather rigid. Once a computers system is designed and programmed, making even minor corrections or improvements can be quite costly and time consuming. For this reason a great care is required in design and development of computer systems.
4. Computers require use of sophisticated equipment and support facilities. For example, a person solving a problem of maths using just a pen and paper can carry these with him or her anywhere with ease. However if the same problem is to be solved using a computer, the person will not only need access to a suitable computer, it will also be necessary to have the required software and suitable electric power to run the computer.
5. The cost of computer and associated equipments is falling steadily. Still these equipments are and continue to be much more costly as compared to manual processing equipments like pen and pencil. Also technological complexity of these equipment makes it more difficult to learn and maintain these equipments as compared to equipments. of manual information processing.
6. Use of computers require additional infrastructure, such as power supply and software back up. This increases the chances of problems due to failure of infrastructure. For example, a computer will not work where there is no electric power supply. Even a laptop with a battery will work without power supply only for a limited period.
7. Failures of computer system can be more serious and difficult to correct. For example, one scratch on a hard disk can make the complete data on the disk inaccessible. In comparison, manual system faults have comparatively limited impact. One page torn from a cabinet full of documents has no impact on other documents.
8. Computers generally reduces the errors of processing. However if there is an error in input data, it can result in major blunders in the processing which the computer system is unable to detect. In manual systems the chances of such blunders passing undetected and corrected is much less.
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