Introduction; About The Serial Ata Interface - Seagate Video 2.5 HDD Product Manual

1.0

Introduction

This manual describes the functional, mechanical and interface specifications for the following: Seagate® Video 2.5 HDD model drives:
Standard models
ST500VT000 - 1DK142
ST500VT001 - 1K6142
ST320VT000 - 1DK14C
ST250VT000 - 1DK141
These drives provide the following key features:
 1000 Gs nonoperating shock and 400 Gs of operating shock.
 16MB buffer. (ST500VT000, ST320VT000 and ST250VT000 models)
 32MB buffer. (ST500VT001 model)
5400-RPM spindle speed.

Full-track multiple-sector transfer capability without local processor intervention.

 High instantaneous (burst) data-transfer rates (up to 6Gb/s).
 Native Command Queuing (NCQ) with command ordering.
 Perpendicular recording technology.
 Quiet operation. Fluid Dynamic Bearing (FDB) motor.
Reliability for 24x7 video applications.

 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 Read Multiple and Write Multiple commands.
 Support for S.M.A.R.T. drive monitoring and reporting.
The 3D Defense System™, which includes Drive Defense, Data Defense and Diagnostic Defense, offers the industry's most comprehensive

protection for disk drives.
 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 you to
install a Serial ATA host adapter and Serial ATA disk drive in your current system and expect all of your 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 (slave) accessed at the same set of
Note
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
Seagate Video 2.5 HDD Product Manual, Rev. J (Draft 1)
.
www.serialata.org
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