This is known as program/erase or P/E cycle. Once you fill the available memory of an SSD, it can only store new information by erasing older data (by overwriting). Unlike mechanical hard drives, SSDs use flash memory cells to store data.

Therefore, it is not easy for data recovery software to recover data from an SSD, if the file is overwritten/erased, instead of deleted.Ĭlick on this link to read more about HDD and SSD Comparison. This TRIM command overwrites that file instead of simply marking the file location as 'unused' (as in mechanical hard drives). Moreover, when you delete a file on the SSD, a TRIM command is issued. With every write process, the memory of the SSD wears out. A file that you write on an SSD isn't copied on a physical disk. A data recovery software can easily recover that file from the unused space before a new file overwrites the unused space. Space where the file was previously located is marked 'unused,' and a new file can occupy that space. When you deleted a file in the traditional mechanical hard drives, it isn't removed from the operating system.

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