Publication number: 100544218, Rev. A November 2008
Seagate, Seagate Technology and the Wave logo are registered trademarks of Seagate Technology LLC
in the United States and/or other countries. DiamondMax, MaxBlast, Maxtor and the Maxtor logo are either
trademarks or registered trademarks of Seagate Technology LLC or one of its affiliated companies in the
United States and/or other countries. All other trademarks or registered trademarks are the property of
their respective owners.
When referring to hard drive capacity, one gigabyte, or GB, equals one billion bytes and one terabyte, or
TB, equals one trillion bytes. Your computer's operating system may use a different standard of measure
ment and report a lower capacity. In addition, some of the listed capacity is used for formatting and other
functions, and thus will not be available for data storage. Seagate reserves the right to change, without
notice, product offerings or specifications.
DiamondMax 22 Serial ATA Product Manual, Rev. Aiii
1.0Introduction
This manual describes the functional, mechanical and interface specifications for the following Seagate
DiamondMax
STM31000334AS
STM3320614AS
STM3160813AS
These drives provide the following key features:
• 7,200 RPM spindle speed.
• High instantaneous (burst) data-transfer rates (up to 300 Mbytes per second).
• Perpendicular recording, Tunneling Magnetoresistive (TMR) recording heads and EPRML technology, for
increased areal density.
• State-of-the-art cache and on-the-fly error-correction algorithms.
• Native Command Queueing with command ordering to increase performance in demanding applications.
• Full-track multiple-sector transfer capability without local processor intervention.
• Quiet operation.
• SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
• Support for S.M.A.R.T. drive monitoring and reporting.
• Supports latching SATA cables and connectors.
• Worldwide Name (WWN) capability uniquely identifies the drive.
®
22 Serial ATA model drives:
DiamondMax 22 Serial ATA Product Manual, Rev. A1
1.1About 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 disc drive in your current
system and expect all of your existing applications to work as normal.
The Serial ATA interface connects each disc 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.
Note.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 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.sata-io.org.
2DiamondMax 22 Serial ATA Product Manual, Rev. A
2.0Drive 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
following drive models:
STM31000334AS
STM3320614AS
STM3160813AS
Specification summary tables
The specifications listed in the following tables are for quick reference. For details on specification measurement or definition, see the appropriate section of this manual.
DiamondMax 22 Serial ATA Product Manual, Rev. A3
Table 1: Drive specifications summary for 1000 Gbyte models
Drive specificationSTM31000334AS
Formatted capacity (512 bytes/sector)*1000 Gbytes
Guaranteed sectors1,953,525,168
Heads6
Discs3
Bytes per sector512
Default sectors per track63
Default read/write heads16
Default cylinders16,383
Recording density1300kbits/in max
Track density182 ktracks/in avg
Areal density228 Gbits/in2 avg
Spindle speed7,200 RPM
Internal data transfer rate1520 Mbits/sec max
Sustained data transfer rate OD120 Mbytes/sec max
I/O data-transfer rate300 Mbytes/sec max
ATA data-transfer modes supportedPIO modes 0–4
Cache buffer32 Mbytes
Height (max)26.1 mm (1.028 inches)
Width (max)101.6 mm (4.000 inches) +/- 0.010 inches
Length (max)146.99 mm (5.787 inches)
Weight (typical)630 grams (1.389 lb.)
Average latency4.16 msec
Power-on to ready20 sec max
Standby to ready15 sec max
Track-to-track seek time<0.8 msec typical read;
Average seek, read<8.5 msec typical
Average seek, write<10.0 msec typical
Startup current (typical) 12V (peak)2.8 amps
Voltage tolerance (including noise)5V +10% / -7.5%
Ambient temperature0° to 60°C per hour max (operating)
Temperature gradient20°C per hour max (operating)
Relative humidity5% to 95% (operating)
Relative humidity gradient30% per hour max
Wet bulb temperature37.7°C max (operating)
Altitude, operating–60.96 m to 3,048 m
Altitude, nonoperating
(below mean sea level, max)
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
Formatted
capacity*
Guaranteed
sectors
Bytes per sector
2.1.1LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,
where n is the number of guaranteed sectors as defined above.
See Section 4.3.1, "Identify Device command" (words 60-61 and 100-103) for additional information about 48bit addressing support of drives with capacities over 137 Gbytes.
2.2Default logical geometry
CylindersRead/write headsSectors per track
16,3831663
LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,
where n is the number of guaranteed sectors as defined above.
2.3Recording and interface technology
1000 GB Model320 and 160 GB Models
InterfaceSerial ATA (SATA)
Recording methodPerpendicular
Recording density (kbits/inch max)13001250
Track density (ktracks/inch avg)182182
Areal density (Gbits/inch2 avg)228219
Spindle speed (RPM)7,200 ± 0.2%
Internal data transfer rate (Mbits/sec max)15201460
Sustained data transfer rate (Mbytes/sec max)120115
I/O data-transfer rate (Mbytes/sec max)300
8DiamondMax 22 Serial ATA Product Manual, Rev. A
2.4Physical characteristics
Maximum height (1000 GB models)26.1 mm (1.028 inches)
Maximum height (320-160 GB models)20.17 mm (0.794 inches)
Maximum width101.6 mm (4.000 +/- 0.010 inches)
Maximum length146.99 mm (5.787 inches)
Typical weight
1000 GB models630 grams (1.389 lbs)
320 GB models405 grams (0.893 lbs)
160 GB models390 grams (0.860 lbs)
Cache buffer
STM31000334AS32 Mbytes (32,768 kbytes)
STM3320614AS16 Mbytes (16,384 kbytes)
STM3160813AS 8 Mbytes (8,192 kbytes)
2.5Seek 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.
Typical seek times (msec)Read Write
Track-to-track (1000, 320 and 160 GB models)<0.8<1.0
Average (1000 GB model)<8.5<10.0
Average (320 and 160 GB models)<11.0<12.0
Average latency:4.16
Note.These drives are designed to consistently meet the seek times represented in this manual. Physical
seeks, regardless of mode (such as track-to-track and average), are expected to meet the noted
values. However, due to the manner in which these drives are formatted, benchmark tests that
include command overhead or measure logical seeks may produce results that vary from these
specifications.
DiamondMax 22 Serial ATA Product Manual, Rev. A9
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