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Product Manual
®
Momentus 5400.2 SATA
ST9120821AS
ST9100824AS
ST98823AS
ST96812AS
ST94813AS
ST93811AS
100367122
Rev. C
August 2007
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©2004-2007, Seagate Technology LLC All rights reserved. Publication number: 100367122, Rev. C August 2007 Seagate, Seagate Technology and the Wave logo are registered trademarks of Seagate Technology LLC in the United States and/or other countries. Momentus, Seagate- SeaBOARD, SeaFONE, SeaTDD, and SeaTools are either trademarks or registered trade- marks of Seagate Technology LLC or one of its affiliated companies in the United States and/ or other countries. All other trademarks or registere
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Contents 1.0 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 About the Serial ATA interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.0 Drive specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1 Specification summary table . . . . . . . . . . . . . . . .
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ii Momentus 5400.2 SATA Product Manual, Rev. C
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List of Figures Figure 1. Momentus 5400.2 SATA disc drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 2. Typical +5V only startup and operation current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 3. Serial ATA connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 4. Attaching SATA cabling . . . . . . . . . . . . . . . . . . . . . . .
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1.0 Introduction This manual describes the functional, mechanical and interface specifications for the following Seagate ® Momentus 5400.2 SATA model drives: � ST9120821AS � ST9100824AS � ST98823AS � ST96812AS � ST94813AS � ST93811AS These drives provide the following key features: � 5,400 RPM spindle speed. � 8 Mbyte buffer. � High instantaneous (burst) data-transfer rates (up to 150 Mbytes per second). � Tunneling Magnetoresistive (TMR) recording heads. � State-of-the-art cache and on-the-fly
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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 jump- ers 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 f
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2.0 Drive specifications � Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal power. For convenience, the phrases the drive and this drive are used throughout this manual to indicate the ST9120821AS, ST9100824AS, ST98823AS, ST96812AS, ST94813AS and ST93811AS models. 2.1 Specification summary table The specifications listed in this table are for quick reference. For details on specification measurement or defi- nition, see the appropriate sect
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Table 1: Drive specifications Drive specification ST9120821AS ST9100824AS ST98823AS ST96812AS ST94813AS ST93811AS Startup current, (typical, peak) +5V: 1.1A Track-to-track seek time 1.0 (read), 1.5 (write) (msec typical) Average seek, read (msec typical) 12.5 Average seek, write (msec typical) 14.5 Seek power (typical) 2.20 watts Read/write power (typical) Read: 1.90 watts; Write: 2.30 watts Idle mode, low power (typical) 0.80 watts Standby mode (typical) 0.28 watts** Sleep mode (typical) 0.28
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Table 1: Drive specifications Drive specification ST9120821AS ST9100824AS ST98823AS ST96812AS ST94813AS ST93811AS Load/Unload (U/UL) cycles 25°C, 50% relative humidity 600,000 software-controlled power on/off cycles 20,000 hard power on/off cycles 32°C, 80% relative humidity 5°C, 80% relative humidity 600,000 software-controlled power on/off cycles 5°C, 10% relative humidity 20,000 hard power on/off cycles 55°C, 16% relative humidity Supports Hotplug operation per SATA Yes (requi
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2.4 Physical organization Drive model Read/write heads Number of discs ST9120821AS 4 2 ST9100824AS 4 2 ST98823AS 3 2 ST96812AS 2 1 ST94813AS 2 1 ST93811AS 1 1 2.5 Recording and interface technology Interface Serial ATA (SATA) Recording method 16/17 EPRML Recording density BPI (bits/inch max) 778k Track density TPI (tracks/inch max) 126k 2 Areal density (Mbits/inch max) 98.2 Spindle speed (RPM) (± 0.2%) 5,400 Maximum Internal transfer rate (Mbytes/sec) 42 I/O data-transfer rate (Mbytes/sec max
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2.7 Seek time Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The specifications in the table below are defined as follows: � Track-to-track seek time is an average of all possible single-track seeks in both directions. � Average seek time is a true statistical random average of at least 5,000 measurements of seeks between random tracks, less overhead. Table 2: Typical seek times Typical seek times (msec) Read Write T
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2.9 Power specifications The drive receives DC power (+5V) through a native SATA power connector. 2.9.1 Power consumption Power requirements for the drives are listed in the table on page 8. Typical power measurements are based on an average of drives tested, under nominal conditions, at 25°C ambient temperature, after 25 minutes of oper- ation. • Spinup power Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating speed. � Seek mode During seek m
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Figure 2. Typical +5V only startup and operation current profile 2.9.2 Deferred spinup Momentus 5400.2 SATA drives provide a deferred spinup feature which storage subsystem controllers can use to sequence disc drive initialization. This is beneficial to systems which include multiple Serial ATA hard disc drives because it allows subsystem controllers to stagger the spinup of each drive to accommodate available power supply current. This feature does not impact time-to-ready in typical de
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2.9.3 Conducted noise Input noise ripple is measured at the host system power supply across an equivalent 15-ohm resistive load on the +5 volt line. Using 5-volt power, the drive is expected to operate with a maximum of 100 mV peak-to-peak square-wave injected noise at up to 10 MHz. Note. Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current. 2.9.4 Voltage tolerance Voltage tolerance (including noise): 5V ± 5% 2.9.5 Power-management modes Th
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� Idle and Standby timers Each time the drive performs an Active function (read, write or seek), the standby timer is reinitialized and begins counting down from its specified delay times to zero. If the standby timer reaches zero before any drive activity is required, the drive makes a transition to Standby mode. In both Idle and Standby mode, the drive accepts all commands and returns to Active mode when disc access is necessary. 2.10 Environmental specifications 2.10.1 Ambient temperature
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2.10.5 Shock All shock specifications assume that the drive is mounted securely with the input shock applied at the drive mounting screws. Shock may be applied in the X, Y or Z axis. 2.10.5.1 Operating shock These drives comply with the performance levels specified in this document when subjected to a maximum operating shock of 250 Gs based on half-sine shock pulses of 2 msec. Shocks should not be repeated more than two times per second. 2.10.5.2 Nonoperating shock The nonoperating shock leve
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2.11 Acoustics Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All mea- surements are consistent with ISO document 7779. Sound power measurements are taken under essentially free-field conditions over a reflecting plane. For all tests, the drive is oriented with the cover facing upward. For seek mode tests, the drive is placed in seek mode only. The number of seeks per second is defined by the following equation: (Number of seeks per second =
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2.13 Reliability Measurement type Specification 14 Nonrecoverable read errors 1 per 10 bits read, max. Mean time between failures 330,000 power-on hours At nominal power, 25°C ambient temperature. Max case temperature: 65°C at the case measurement location shown in Figure 5. Load/Unload (U/UL) 25°C, 50% relative humidity 600,000 software-controlled power on/off cycles 20,000 hard power on/off cycles 32°C, 80% relative humidity 600,000 software-controlled power on/off cycles 5°
