However, hard drive overwrites may decrease its performance. Therefore, we suggest users overwrite the disk not just delete all data before they sell or borrow your disk to someone else. This means if someone takes some actions, like making use of some data recovery tool, the deleted files or data will be tracked back. However, the data only is DELETED on the hard drive, not ERASED from the hard drive. Some users delete old files or format partitions to get more black space to store new data because they think the new data will overwrite hard drive, and the old data cannot be retrieved. In general, hard drive overwrite is to record or copy new data over existing data, as in when a file or directory is updated, and data that is overwritten cannot be retrieved.
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