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So I'm getting slow download speeds with nzbget and ninja...I'm running on HDD, but surely it should be capping my bandwidth at around 60/70mb/s, not a measly 20/30mb/s right?? Even if it's HDD, it's still quite slow.
From experience, you can hit 100MB/s on a mechanical drive, but it depends on what else is running and how you're set-up. How large is your queue? Very large queues result in much slower downloads (think trakt). Are have you tried pausing downloads for RAR/PAR repairs? What's the IO Wait looking like?