1. qnap

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qnap faq より

Why the hard drive of NAS does not go to standby mode? 

First of all, make sure you have enabled the "disk standby mode" function in System Tools/ Hardware Settings on the administration page.
If the function does not work according to your settings, you may check if the following services are running. 
There must NOT be any access to these services for the HDD standby mode to work.
  1. UPnP/Twonkymedia function on NAS
  2. NTP server
  3. BT download

  4. Microsoft Networking -> AD service, WINS server, Domain Master

  5. Share folder mapping
  6. Network access to the NAS. If the NAS is connecting to Internet, make sure you don’t enable DMZ or port forwarding on your router/firewall. Hacker may try to connect your NAS and thus prevent HDDs to entering standby.

  7. QNAP Finder, Quick Install Wizard, NetBak Replication, QGet. These programs will keep checking the existence of the NAS and prevent it to entering standby.

  8. If your NAS is shared among multiple PC on the same network, be sure there is no access from the PC to the NAS. You can disconnect the LAN cable to assure this.

  9. If you have installed add-on programs like SlimServer on your NAS, the HDD standby mode of QNAP NAS might not function since these programs might affect the service access status to the NAS.

  1. If you have copy a lot of pictures to the NAS, the NAS will create the thumbnail files for the pictures. This may take a long time (even days if there are many pictures). You can see a running process “/usr/local/sbin/ImR_all -soft /Qmultimedia” after issue ps command. Please wait patiently for this process to complete.