Today's fact: When you delete a file, it's usually not gone right away. Your computer just removes its entry and marks that storage space as free, while the actual data stays there until something else overwrites it. That's why deleted files can often be recovered. But if new data gets written over the same spot, the old file is usually gone for good.

This is true for both HDDs and SSDs. However, SSDs have a feature called TRIM that tells the drive which deleted data is no longer needed. This helps keep SSDs fast and means deleted files may become unrecoverable much sooner than they do on an HDD.