BACKGROUND
When you delete information from a hard drive, It's not gone, but, rather, is the index to this information which tells us that the hard drive could overwrite the old data. This is not possible with a SSD where an SSD can only write data to a clean block. It is like building a house where an old house used to stand. Trim is the command from the operating system to the SSD to clean free blocks of an SSD and make them ready for future storage.
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