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When referring to 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 measurement 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. Actual quantities will
vary based on various factors, including file size, file format, features and application software. Actual data rates may vary
depending on operating environment and other factors. The export or re-export of hardware or software containing encryption
may be regulated by the U.S. Department of Commerce, Bureau of Industry and Security (for more information, visit
www.bis.doc.gov), and controlled for import and use outside of the U.S. Seagate reserves the right to change, without notice,
product offerings or specifications.
For information regarding online support and services, visit
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• Presales & Technical support
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This manual describes the functional, mechanical and interface specifications for the following Seagate
Seagate® Terascale HDD model drives:
Model NumberSeagate Instant Secure Erase (ISE)
ST4000NC001No
ST4000NC000Yes
These drives provide the following key features:
• 5900 RPM spindle speed.
• PowerChoice™ for selectable power savings
• High instantaneous (burst) data-transfer rates (up to 600MB per second).
• Perpendicular recording technology provides the drives with 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.
• 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.
1.1About the SATA interface
The Serial ATA (SATA) 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, SATA makes the transition from parallel ATA easy by providing legacy software support. SATA was designed to
allow you to install a SATA host adapter and SATA disk drive in your current system and expect all of your existing
applications to work as normal.
The SATA interface connects each disk drive in a point-to-point configuration with the SATA host adapter. There is no master/
slave relationship with SATA devices like there is with parallel ATA. If two drives are attached on one SATA 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
Note
The SATA 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 SATA host adapter contains a set of registers that shadow the contents of the traditional device registers, referred to as the
Shadow Register Block. All SATA devices behave like Device 0 devices. For additional information about how SATA
emulates parallel ATA, refer to the “Serial ATA International Organization: Serial ATA Revision 3.0”. The specification can be
downloaded from www.sata-io.org.
separate SATA 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 SATA environment.
Seagate Terascale HDD Product Manual, Rev. B2
www.seagate.com
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:
Standard modelsSeagate In(SED) models
ST4000NC001ST4000NC000
2.1Specification summary tables
The specifications listed in Table 1.
For details on specification measurement or definition, refer to the appropriate section of this manual.
Table 1Drive specifications summary for 3TB, 2TB and 1TB models
From this page, click on the “Verify Your Warranty” link. You will
be asked to provide the drive serial number, model number (or
part number) and country of purchase. The system will display
the warranty information for your drive.
Supports Hotplug operation per the Serial ATA Rev. 3.0 specificationYes
* One GB equals one billion bytes and 1TB equals one trillion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating
environment and formatting.
** During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and power to operational
levels.
2.2Formatted capacity
ModelFormatted capacity*Guaranteed sectors Bytes per sector
ST4000NC001
ST4000NC000
*One GB equals one billion bytes and 1TB equals one trillion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating
environment and formatting.
4TB7,814,037,168
(512 byte emulation)
4096
Seagate Terascale HDD Product Manual, Rev. B4
www.seagate.com
2.2.1LBA 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 48-bit addressing
support of drives with capacities over 137GB.
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 5000 measurements of seeks between random tracks, less
overhead.
Typical seek times (ms)Read Write
Track-to-track1.01.2
Average16.016.0
Average latency5.1
These drives are designed to consistently meet the seek times represented in this manual. Physical seeks,
Note
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.
2.6Start/stop times
4TB models
Power-on to ready (sec)17 (max)
Standby to ready (sec)17 (max)
Ready to spindle stop (sec)20 (max)
2.7Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. Refer to Figure 4 on page 19.
2.7.1Power consumption
Power requirements for the drives are listed in Table 2:. Typical power measurements are based on an average of drives tested,
under nominal conditions, using 5.0V and 12.0V input voltage at 25°C ambient temperature.
• 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 mode, the read/write actuator arm moves toward a specific position on the disc surface and does not execute a
read or write operation. Servo electronics are active. Seek mode power represents the worst-case power consumption, using
only random seeks with read or write latency time. This mode is not typical and is provided for worst-case information.
• Read/write power and current
Read/write power is measured with the heads on track, based on a 16-sector write followed by a 32-ms delay, then a 16sector read followed by a 32-ms delay.
• Operating power and current
Operating power is measured using 40 percent random seeks, 40 percent read/write mode (1 write for each 10 reads) and
20 percent drive idle mode.
• Idle mode power
Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in a random track
location.
• Standby mode
During Standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/write electronics
are in power-down mode..
Seagate Terascale HDD Product Manual, Rev. B6
www.seagate.com
Table 2: 4TB Drive DC power requirements
6.0Gb mode
Voltage
Regulation
Avg Idle Current *
Advanced Idle Current *
* During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and power to operational
levels.
• Spinup power
Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating