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...
Fault tolerance is the way in which an operating system (OS) responds to a hardware or software failure. The term essentially refers to a system’s ability to allow for failures or malfunctions, and this ability may be provided by software, hardware or a combination of both. To handle faults gracefully, some computer systems have two or more duplicate systems.
Fault tolerance software may be part of the OS interface, allowing the programmer to check critical data at specific points during a transaction.
Fault tolerance can include:
In general, 100% fault tolerance can never be achieved due to cost constraints.
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