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At the time of the delete, the SSD can read the block into memory, erase the block, and write back only pages with data in them, as illustrated here. When the OS deletes a file on an SSD, it updates the file system but also tells the SSD via the TRIM command which pages should be deleted.

Windows 7 and Windows Server 2008 R2 support the TRIM function, which OS use this function when they detect that a file is being deleted from an SSD. This is where the TRIM function comes in.

In the other hand, unlike with traditional hard disks, it would be advantageous to tell the SSD when you delete files so that the SSD could delete the pages at the time of the delete instead of performing the entire block erase procedure when you want to write data. TRIM enables the SSD to handle garbage collection overhead, that would otherwise significantly slow down future write operations to the involved blocks. In computing, a TRIM command allows an operating system to inform a solid state drive (SSD) which data blocks, such as those belonging to a deleted file or affected by a format command, are no longer considered in use and can be wiped internally.

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