15 bay nas nas enclosure max hard drives 15 hard drive form factors 25 35 inch hard drive types hdd ssd hard drive mounting removable drive hard drive access front hard drive locations horizontal vertical internal interfaces sas 20 sata iii target audience business internal file system ext4 external file systems ext3 ext4 ntfs fat32 hfs raid levels 0 1 5 6 10 jbod single disk networking 10 gigabit gigabit 101001000 connections 4x usb 3