About SSDs and LBA
An SSD writes small bits data to “pages,” and multiple pages make up blocks. The SSD uses something called Logical Block Addressing (LBA) to keep track of which pages and blocks have information on them. This is a kind of map that details which pages and blocks are and aren’t occupied with “good” data. When you delete information from an SSD, that information isn’t really deleted. Rather, a reference to it is removed from the LBA and it’s marked as invalid data. When the drive can’t find any remaining open pages, it looks for the pages that contain invalid data to erase to make room for the fresh stuff.
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