Hi. I have the same problem with NAS as people in this posts:
n8800-wd-green-drive-nightmare
n8800-red-light-when-bay-empty
(as a new user i cannot insert links)
but my disks are 8x Samsung HD103UJ (1TB, 32MB cache) - disks are listed in compability list.
I don't test this on the working system but when i start checking badblocks on all disks in the same time - some of them is dropped(red light) and bays are not working without system restart. When i check for badblocks indyvidually - all is ok. Probably it's system overload problem.
Please tell me which disks works without problems in N8800
from your own experience
Capacity is not important but speed.
Sorry for my poor english.