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Optimize ssd - TRIM or zero fill?


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according to this 



Defraggler will use TRIM by default but use zero fill if TRIM is not available.


I'm using Defraggler 2.19 on Windows 7 64 bit and have verified that my system is using TRIM, but when I run "Optimize" , Defraggler says "Optimize operation will zero-fill your drive.... " 


Seems like a bug, no?

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