Modern HDDs, and particularly SSDs, work very differently here.Įncrypt your storage. The multiple-pattern-overwrite stuff dates back to floppy disks and to 1980s-era hard disk drives, which all had really sloppy head positioning. (HDDs have an earlier form of this, which makes overwriting problematic.) You can’t write to the same physical sector on an SSD, as sectors are remapped on each deletion, and each rewrite. SSD sectors cannot be overwritten, due to wear leveling. This is what TRIM expedites, and macOS supports TRIM. SSD sectors are erased very shortly after the files are deleted, and must be erased before the storage is re-used, and SSDs work hard to make that erasure happen quickly. Are you on an SSD? If so, the basic device I/O operations are wildly different from those of a hard disk drive (HDD), and the traditional assumptions based around how hard disk drive erasures work are utterly inapplicable to SSD storage.
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