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I bought a new laptop with a SSHD drive. I usually disable write caching on all my HDDs. Will disabling write caching prevent the SSHD from reaching its full potential?

I tried copying some folders with it enabled / disabled and didn't notice and improvement in performance, but then again, these folders where probably not in the SSD part of the SSHD anyway.

Is write caching recommended / necessary to make full use of my SSHD?

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Even though a SSD is faster than a magnetic HD, RAM is faster yet. My inclination would be to allow write caching for two reasons:

  1. It should be faster than actually writing to the SSD.

  2. There should be less wear on the SSD, which has a finite number of writes available. That said, SSD's can write terabytes of data before failure.

One reason to turn off write caching is where frequent crashes are expected, as in a programming environment. In C++ development, I lost changes to programs that caused BSD, until I shut caching.

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