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[xpmps]

You have this option turned on?
What advantages / disadvantages are there? .. apart from saving energy and extending the life of the disc?

What conditions must be met to go into hibernation?

[JavaLawyer]

Enabling hibernation permits you to specify how long a HDD sits idle (not accessed) before spinning down.

There are many competing theories on this subject. The answer depends on which school of thought you follow. Spinning-up a hard drive creates stress on the spindle motors, which over time could shorten life expectancy. That said, keeping a drive in a constant spin-state will increases heat generation and creates other forms of stress that may impact life expectancy. Meanwhile, there's another school of thought that says that hard drives are designed to spin up/down, and are rated for x number of spin up/down cycles, so using these cycles is considered normal use.

I would think that spinning up/down every 10-15 minutes 24x7 is worse for your HDDs than keeping them in a constant spin state.

[JavaLawyer]

Expanding on my last post, the first time a hibernating HDD is accessed, there will be a 8 to 10 second delay while the HDD spins-up. After this initial delay, the HDD will access normally until the next hibernation.

Depending on your DNS-325 usage patterns and hibernation settings, hibernation may impact productivity.

For example, if you access the DNS-325 three times per hour, with a hibernation time of 10 minutes, then there is a strong likelihood that the HDD will be spun-down before each access attempt, causing a 10 second delay 100% of the time. If the hibernation time is increased from 10 minutes to 45 minutes, then the HDD will be spun-up most (if not all) of the time, eliminating the delay.  Alternatively, a 10 minute hibernation may be appropriate if you access the DNS-325 only once per hour.

If you chose to use hibernation, you should adjust the timing to meet your usage habits. Selecting the correct balance will minimize disruption to productivity, maximize energy savings, and minimize HDD wear and tear.

[xpmps]

It is difficult to see which option is most appropriate.
Using the NAS.
1. usually entered in the afternoon to do some management.
2. I have it set to backup the information night.
3. Bittorrent client running 24 hours.
4. Occasional access see 1 or 2 days a week from the TV.

[JavaLawyer]

Some users leave the HDD spinning 24x7, others do the complete opposite. I don't know if there is a true right and wrong way of doing things. I would just avoid setting the hibernation delay so low that the HDD is constantly spinning up and down.

The only unknown I see with the information in your last post is how frequently the Bittorrent client is polled, which would cause the HDD to spin up.

When all is said and done, I wouldn't stress over this.