Please check there is not external device plug on the diskstation. Please use latest Synology Assistant to install, you can download it in our Download Center.
It might to be two factor to cause this issue.
1. disk is damaged.
2. disk slot on its main board is damaged.
Please also refer this FAQ to format partition on these new disks.
http://www.synology.com/support/faq_sho ... 6&lang=enu
We recommend you to take out the hard disk(s) and connect it (them) to your PC, then use the official diagnostic tools below to Full / Extended test (not suggest using quick test) and check if the hard disk(s) is fine:
[Seagate HDD: Seatool]
http://www.seagate.com/www/en-us/suppor ... s/seatools
Please install one disk in another slot to see if it is recognized, you can try to swap disk in different slot.
If disks are fine but can't recognized onto diskstation (after done formatting partition and checking), please direct contact local vendor/reseller to RMA it.
Hope this helps.
No harddisk found. Make sure the harddisk is connected to the motherboard.
If your installing via WiFi, switch to ethernet-cable for both your DiskStation and your PC-client and make another try.
An error happened during installation. The Telnet-service is activated to identify the problem. Configure your router to forward port 23 to DiskStation and contact Synology Online Support
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