The majority of today's test, measurement, and control systems include at least one hard drive. This hard drive may reside in the desktop or laptop PC that is controlling the system, or, as is the case with modular platforms such as PXI, it may be integrated into an embedded controller. Many stand-alone instruments also include an internal hard drive. Regardless of where the hard drive is located in the system, one must consider a number of factors when selecting it. These factors include the environmental conditions of the system deployment, the planned use of the system, and the requirements for redundancy and spares for the system. Additionally, it is important to have a basic understanding of how a hard drive works.
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