Hi, Because I'm very pleases how NAS200 work, I make decision for maximum upgrade and buy two disk Hitachi Ultrastar 2*2TB. In my house network, NAS200 cooperate as backup with main HP meida smart server EX470. Of course I use software attached to NAS200 called NTI shadow for backup family hd moves and photos. On new disks, full backup process should take about 7 days, but after three hours smart report near 58 degrees of Celsius. Hitachi specification inform about 60dC as maximum. This situation force me to improve cooling disks in NAS200 some facts: OEM cooler 12V 3,7 CFM replacement 12V from sunon have 6CFM but it's small improvement I found fans from susnon's 5V 6 CFM but spec allow use 6V and I can expect 6+ CFM I make Decision to use parallel two sunons connected serial do power connector and leave OEM cooler for force flow air on second disk after all typical temperature is about 42-47 Celsius under work in six day of backup (temps can be read by command /usr/sbin/smartctl -A /dev/sda (b) ) for create hole i just use dremel I use option 10mins for disk and fans but this function work life in own world. I can't find how to correct/improve work this function. Some times fans work 30 mins, some times few hours after spin down (EDIT; after replace empty battery clock, spin down and fan off works well ) Some pictures from mod.