The difference between NAS and DAS is as follows: NAS DAS NAS stand for Network Attached Storage  DAS stands for Direct Attached Storage Storage capacity of NAS is between 109 to 1012 in byte. Storage capacity of DAS is 109 in byte. In NAS, Storage is distributed over distinct servers on a network In DAS, storage is attached to the node where computation process is taking place. It has moderate storage management cost It has high storage management cost Data transmission takes place using Ethernet or TCP/IP. Data transmission takes place using IDE/ SCSI