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Question: Write speed is VERY low for a new SSD

I have a very slow write speed, and a reasonable read speed on my Mac.


I have a MacBook Pro 13 Inch, Late 2011 that supports SATA 3

I upgraded the RAM to 8Gb (2 x 4Gb)and updated the hard drive to WD SSD Drive 240 GB

I have installed a fresh High Sierra version.

I disabled the FileVault while installing, and I enabled TRIM to the new SSD after that


However, i used BlackMagic speed test, and i got a read speed from 450 to 520Mb/s BUT the write speed ranges from 90 till 150 Mb/s..... I do not believe that this is normal.. i left it for while but still the speed is shocking me


any ideas please?


Thank You


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MacBook Pro, macOS High Sierra (10.13.3), Late 2011

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User profile for user: MagdyAbdullah

Question: Write speed is VERY low for a new SSD