Seagate BarraCuda Product Manual, Rev. D
5
1.0 Introduction
This manual describes the functional, mechanical and interface specifications for the following
Seagate® BarraCuda® model drives:
These drives provide the following key features:
•
Compliant with RoHS requirements in China and Europe.
•
High instantaneous (burst) data-transfer rates (up to 600MB per second).
•
Native Command Queuing with command ordering to increase performance in demanding applications.
•
Quiet operation.
•
SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
•
State-of-the-art cache and on-the-fly error-correction algorithms.
•
Support for S.M.A.R.T. drive monitoring and reporting.
•
Supports latching SATA cables and connectors.
•
TGMR recording technology provides the drives with increased areal density.
•
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
.
ST8000DM004
ST6000DM003
ST4000DM004
ST3000DM007
ST2000DM005
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.
