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2 Momentus Product Manual, Rev. B
2.0 Introduction
This manual describes the functional, mechanical and interface specifications for the following Seagate
Momentus
®
model drives:
These drives provide the following key features:
• 5400-RPM spindle speed (on ST9750423AS, ST9750423ASG, ST9640424AS, ST9640423AS & ST9640423ASG
models only)
• 7200-RPM spindle speed on all other models.
• 16MB buffer.
• Free Fall Protection (on ST9750423ASG, ST9750420ASG, ST9640423ASG and ST9500423ASG models only)
• Quiet operation. Fluid Dynamic Bearing (FDB) motor.
• High instantaneous (burst) data-transfer rates (up to 3Gb/s).
• Perpendicular recording technology.
• State-of-the-art cache and on-the-fly error-correction algorithms.
• Native Command Queuing (NCQ) with command ordering.
• Full-track multiple-sector transfer capability without local processor intervention.
• 1000 Gs nonoperating shock and 350 Gs of operating shock.
• SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
• The 3D Defense System™, which includes Drive Defense, Data Defense and Diagnostic Defense, offers the
industry’s most comprehensive protection for disc drives.
• Support for S.M.A.R.T. drive monitoring and reporting.
• Support for Read Multiple and Write Multiple commands.
• Worldwide Name (WWN) capability uniquely identifies the drive.
Standard models Free Fall Protection models
ST9750423AS ST9750423ASG
ST9750422AS
ST9750420AS ST9750420ASG
ST9640424AS
ST9640423AS ST9640423ASG
ST9500424AS
ST9500423AS ST9500423ASG