Please note that the content of this book primarily consists of articles
available from Wikipedia or other free sources online. Direct-attached
storage refers to a digital storage system directly attached to a server
or workstation, without a storage network in between. It is a retronym,
mainly used to differentiate non-networked storage from SAN and NAS. A
typical DAS system is made of a data storage device connected directly
to a computer through a host bus adapter. Between those two points there
is no network device, and this is the main characteristic of DAS. The
main protocols used for DAS connections are ATA, SATA, eSATA, SCSI, SAS,
and Fibre Channel.
