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When an update to a previously written location is received, the write follows the same data path as a new write into the system. The data is saved in write cache and the host is acknowledged to complete the I/O operation. The new data that is received eventually passes through the deduplication and compression algorithms. If needed, the data is written to the back-end drives as part of the normal cache-cleaning operation to a new location within the storage, and the location previously used is invalidated.