Seagate Enterprise NAS HDD +SRS Product Manual, Rev. B
5
1.0
Introduction
This manual describes the functional, mechanical and interface specifications for the following: Seagate
®
Enterprise NAS HDD +SRS
model drives:
These drives provide the following key features:
•
Off-the-shelf compatibility
•
Rated for 1M hours MTBF
•
24x7 capability
•
Performance-tuned for RAID applications
•
Balance technology to support multiple drives in a system
•
Quiet acoustic performance
•
Low activity and idle power
•
Supports ATA8 streaming commands
•
TGMR recording technology provides the drives with increased areal density.
•
State-of-the-art cache and on-the-fly error-correction algorithms
•
Native Command Queuing with command ordering to increase performance in demanding applications
•
Full-track multiple-sector transfer capability without local processor intervention
•
Compliant with RoHS requirements in China and Europe
•
SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
•
Support for S.M.A.R.T. drive monitoring and reporting
•
Supports latching SATA cables and connectors
•
Worldwide Name (WWN) capability uniquely identifies the drive
1.1
About the SATA interface
The Serial ATA (SATA) interface provides several advantages over the traditional (parallel) ATA interface. The primary advantages
include:
•
Easy installation and configuration with true plug-and-play connectivity. It is not necessary to set any jumpers or other configuration
options.
•
Thinner and more flexible cabling for improved enclosure airflow and ease of installation.
•
Scalability to higher performance levels.
In addition, SATA makes the transition from parallel ATA easy by providing legacy software support. SATA was designed to allow users
to install a SATA host adapter and SATA disk drive in the current system and expect all of the existing applications to work as normal.
The SATA interface connects each disk drive in a point-to-point configuration with the SATA host adapter. There is no master/slave
relationship with SATA devices like there is with parallel ATA. If two drives are attached on one SATA host adapter, the host operating
system views the two devices as if they were both “masters” on two separate ports. This essentially means both drives behave as if
they are Device 0 (master) devices.
The SATA host adapter and drive share the function of emulating parallel ATA device behavior to provide backward compatibility with
existing host systems and software. The Command and Control Block registers, PIO and DMA data transfers, resets, and interrupts are
all emulated.
The SATA host adapter contains a set of registers that shadow the contents of the traditional device registers, referred to as the
Shadow Register Block. All SATA devices behave like Device 0 devices. For additional information about how SATA emulates parallel
ATA, refer to the “Serial ATA International Organization: Serial ATA Revision 3.0”. The specification can be downloaded from www.sata-
io.org.
+SRS models
ST6000VN0011
ST5000VN0011
ST4000VN0011
ST3000VN0011
ST2000VN0011
Note
The host adapter may, optionally, emulate a master/slave environment to host software where two
devices on separate SATA ports are represented to host software as a Device 0 (master) and Device 1
(slave) accessed at the same set of host bus addresses. A host adapter that emulates a master/slave
environment manages two sets of shadow registers. This is not a typical SATA environment.
