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A Replace Member operation can occur when there is a SMART predictive failure reporting on a drive in a virtual disk. The automatic Replace Member is initiated when the first SMART error occurs on a physical disk that is part of a virtual disk.
Windows copy (pre Vista) takes a straightforward approach of opening both the source and destination files in cached mode and marching sequentially through the source file reading 64KB at a time (60KB for network copies because of an SMB1.