Given what we know, we can confirm that after completing the successful upgrade of the computer hard drives, in order to repurpose the old drives to be reused we must first perform a drive wipe on each of them.
Therefore, given that the hard drives were in use, we can expect them to contain information and data pertaining to the previous user and their work. In order to prepare the drives to be reused, we perform a drive wipe, which formats them back to their original state and allows access to the full memory amount.
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