@Logical @shadowtofu
The SSD controller does not overwrite the old physical location (unlike HDD).
It writes the new data to a different physical block.
The old block becomes “stale” but still contains your original data until the SSD decides to erase it later.
@Logical Filling an SSD with zeros only affects the logical address space visible to your OS—it doesn't force the controller to erase every physical block. The old data remains in unmapped or retired areas until (or unless) the controller decides to erase it later, potentially allowing recovery with specialized tools. Some SSDs might even optimize by not physically writing zeros if they detect a full block of them, simply marking the space as erased without touching the hardware.