Does OS HDD affect Stoarge HDD speed *test*

I will be setting up 4 drives in RAID 5 and I want to run some tests.

Will the OS HDD (60gb SSD) affect the time and speeds from the testing program, to the storage drives?
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More about does affect stoarge speed test
  1. in some cases, yes.

    The Windows Experience Index ONLY tests the C drive.
  2. So will running HDTune from the OS slow the it down? The SSD is about three years old and isn't as fast as it used to be.
  3. I have heard SSDs degrade with age. Another big factor is the filesystem becomes fragmented and chaotic slowing access down.
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