But if I fill a drive with nonsense data, whether SSD or HDD, shouldn’t it be forced to write such data to all possible locations, thus overwriting the original data? Is am I misunderstanding something more fundamental about how this type of storage works?
@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.
See what I’m still not getting though, is how there can still be unmapped or retired areas, if the drive has been filled with (meaningless) data? Let’s say it isn’t all zeros, but random data instead. Are there more physical blocks than is represented logically by the adress space exposed to the OS?
@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.
But if I fill a drive with nonsense data, whether SSD or HDD, shouldn’t it be forced to write such data to all possible locations, thus overwriting the original data? Is am I misunderstanding something more fundamental about how this type of storage works?
@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.
See what I’m still not getting though, is how there can still be unmapped or retired areas, if the drive has been filled with (meaningless) data? Let’s say it isn’t all zeros, but random data instead. Are there more physical blocks than is represented logically by the adress space exposed to the OS?