Table of Contents
Advertisement
1.
Introduction
This manual describes the functional, mechanical and interface specifications for the following: Seagate® BarraCuda® model drives:
Standard models
ST5000LM000-
ST4000LM024-
2U8170
These drives provide the following key features:
128MB buffer.
•
5400-RPM spindle speed.
•
650 Gs non-operating shock and 300 Gs of operating shock.
•
Full-track multiple-sector transfer capability without local processor intervention.
•
High instantaneous (burst) data-transfer rates (up to 6Gb/s).
•
TM
MTC Technology
, proprietary data flow management.
•
Native Command Queuing (NCQ) with command ordering.
•
Quiet operation with Fluid Dynamic Bearing (FDB) motor.
•
TM
SeaTools
diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
•
Shingled magnetic recording with perpendicular magnetic recording heads/media.
•
State-of-the-art cache and on-the-fly error-correction algorithms.
•
Support for Read Multiple and Write Multiple commands.
•
Support for S.M.A.R.T. drive monitoring and reporting.
•
Worldwide Name (WWN) capability uniquely identifies the drive.
•
1.1
About the Serial ATA Interface
The Serial ATA 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, Serial ATA makes the transition from parallel ATA easy by providing legacy software support. Serial ATA was designed to allow users to
install a Serial ATA host adapter and Serial ATA disk drive in the current system and expect all of the existing applications to work as normal.
The Serial ATA interface connects each disk drive in a point-to-point configuration with the Serial ATA host adapter. There is no master/slave
relationship with Serial ATA devices like there is with parallel ATA. If two drives are attached on one Serial ATA 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 host adapter may, optionally, emulate a master/slave environment to host software where two
devices on separate Serial ATA ports are represented to host software as a Device 0 (master) and Device 1
Note
(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 Serial ATA environment.
The Serial ATA 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 Serial ATA host adapter contains a set of registers that shadow the contents of the traditional device registers, referred to as the Shadow
Register Block. All Serial ATA devices behave like Device 0 devices. For additional information about how Serial ATA emulates parallel ATA, refer to
the Serial ATA International Organization: Serial ATA (Revision 2.6). The specification can be downloaded from www.serialata.org.
Seagate BarraCuda Product Manual, Rev. J
2U817V
6
Advertisement
Table of Contents
