A bad sector is an unusable part or subdivision within a track on a magnetic or optical disc located on a computer's hard disk or flash drive. A bad sector is typically formed as a result of physical damage of some sort, or rarely, the operating system's inability to access the information. The physical damage occurs to the disk surface or as a...
A legacy system is not necessarily defined by age. Legacy may refer to lack of vendor support or a system's incapacity to meet organizational requirements. For example, a large mainframe may use a 64-bit Java, while a Linux platform might utilize code from the 1960s. Legacy conditions refer to a system's difficulty (or inability) to be maintained, supported or improved. A legacy system is usually incompatible with newly purchased systems.
Legacy systems are high maintenance and may involve intricate patching and modifications. Porting techniques are often used for software adjustments or adaptation. Older hardware may require added compatibility layers to facilitate device functionality in incompatible environments.
An organization might continue to use legacy systems for a wide range of reasons, such as the following:
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