It will be used for temporary storage when blocks need to be erased. If You decide to Span two SSDs You should have some Unallocated space set for each drive FWIW.įor example using a SSD made by Intel, you can decrease performance degradation by leaving some space unallocated at the end of the drive. Leaving space unallocated is called Over provisioning and I use a 10% setting for that on my 1Tb Samsung EVO SSDs. It is possible that Your speed is being impacted by the drive always doing garbage collection due to a low amount of free space. Unallocated space you left will be treated as spare area. Your speed may be impacted if the drive has little space for the garbage collection process to run. A hard drives speed will depend on where the data is written and a SSD should stay the same speed no matter how full it is. The biggest problem with filling a SSD if You do not leave unallocated space is that it may shorten drive life as the unallocated space is used as a part of the garbage collection process and as as spare space if a location should go bad.
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