Defraggler and SSDs

What is the TRIM function?

As with a standard HDD, over time, the performance of an SSD will deteriorate with use. This is due to the method in which the SSD reads and writes data.

For example: When you write a file to a new SSD, it will be written directly to the block at full speed. However if you then delete this file, it is not instantly removed. The space it occupies is instead marked by the operating system as “not in use”. When the space is required by the operating system, it will overwrite this space.

However, unlike a standard HDD, it cannot do this in 1 action. It must first erase all the data before it is able to write the new information to the block. When deleting a file on an SSD, a TRIM command is also sent to wipe the marked block clean. This means that the SSD can now write to a completely blank block.

Defraggler is now able to use this TRIM function to optimize your SSD.


What is Zero Fill?

There are occasions when an SSD is not TRIM-capable. In the event of this, Defraggler is able to use an alternative method to help improve the write speed performance of your SSD. This is known as Zero Filling.

The performance of an SSD is based around the time taken to write to a block. This is at its quickest when the block is blank (zero-filled). If there are no blank blocks left, blocks must be erased to provide space for the new data. This slows down the write process. If there is no TRIM function available, the SSD cannot erase the blocks in advanced.

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