internal hddssd 35rdquo or 25rdquo sataii x 5 hard drives not included expansion port x 1 hot swappable hdd yes volume type synology hybrid raid basic jbod raid 0 raid 1 raid 10 raid 5 raid 5spare raid 6 size hxwxd 157mm x 248mm x 233mm weight 391kg system fan 80x80mm x 2 noise level 1 30dba power recovery sync with the connected diskstation default mode ac input power voltage 100v to 240v power frequency 50hz to 60hz single phase op