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Write-Back Cache

Write-back is a cache-writing strategy in which the controller receives the data to be written to disk, stores it in the memory buffer, and immediately sends the host operating environment a signal that the write operation is complete, without waiting until the data is actually written to the disk drive. Write-back caching improves the performance of write operations and the throughput of the controller card. Write-through is a cache-writing strategy in which the controller writes the data to the disk drive before signaling the host operating environment that the process is complete. Write-through has lower write operation and is considered more secure if power failure should occur. Because a battery module is installed, power is supplied to the data cached in memory and the cached writes can be completed when power is restored.

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