Question: 3 identical 5tb hard drives, each having 2 partitions. ntfs formatted..
When running the crystaldiskmark speed tests, partitions on the same drive show significant differences in both read and write tests. Shouldn’t partitions on the same drive produce similar results ?
Anyway to increase the speeds ?

Answer:Partitions on a spinning drive can indeed be slower or faster.
Generally, the partition on the outer portion of the drive will read faster.

At a constant 7200 or 5400 RPM, the outer portion will be going by the drive head faster (more feet per second) than the inner portions of the drive.
This is just the way it works.