One MB is equal to one million bytes, one GB is equal to one billion bytes and one TB equals
1,000GB (one trillion bytes) when referring to storage capacity. Accessible capacity will vary from
the stated capacity due to formatting and partitioning of the drive, the computer’s operating system, and other factors.
The following paragraph does not apply to any jurisdiction where such provisions are inconsistent
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HGST Hard Disk Drive Technical Reference Manual
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HGST Travelstar™ Z7K500.B
Technical Reference Manual
HGST Hard Disk Drive Technical Reference Manual
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HGST Hard Disk Drive Technical Reference Manual
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TABLE OF CONTENTS
1. DESCRIPTION AND FEATURES.................................................................................................. 9
1.1 General Description ....................................................................................................... 9
Table 2-3 Full Model Number Description..................................................................................................................21
Table 4-5 Definitions for the 512 Bytes.......................................................................................................................35
HGST Travelstar 2.5 inch hard drives combine a high performance 7200 RPM spin speed, 32 MB
cache and SATA 6 Gb/s interface for the ultimate in power computing for notebooks.
1.2Product Features
Serial ATA (SATA) — Serial ATA (SATA) is the next generation bus interface for
2.5-inch hard drives. It is designed to replace Parallel ATA, and has many advantages
including increased transfer rate, improved signal integrity, enhanced data protection, and hot
plug support.
Advanced Format (AF) — Technology adopted by HGST and other drive manufacturers to
increase media format efficiencies, thus enabling larger drive capacities.
Perpendicular Magnetic Recording (PMR) — With PMR technology the magnetization of
each data bit is aligned vertically to the spinning disk, rather than longitudinally as has been
the case in hard drive technology for decades. This enables more data on a given disk than is
possible with conventional longitudinal recording, and provides a platform for future
expansion of hard drive densities.
Reduced Power Spinup (RPS) — HGST’s optimized start up feature specifically designed for
the external hard drive and Consumer Electronics (CE) market. Specific focus for RPS is to
minimize the duration and magnitude of the peak power consumption from the hard drive.
System-on-Chip - The System-on-Chip (SOC) is the foundation for HGST's next generation
electronics and firmware architecture. The native SATA SOC lowers component count by
integrating a hard disk controller, high performance processor, high speed execution SRAM,
and read channel in a 128-pin package.
S.M.A.R.T. Command Transport (SCT) — The SCT Command Transport feature set provides
a method for a host to send commands and data to a device and for a device to send data and
status to a host using log pages.
Reliability Features Set-Data Lifeguard™ — Representing HGST's ongoing commitment to
data protection, Data Lifeguard includes features that enhance the drive’s ability to prevent
data loss. Data Lifeguard data protection utilities include thermal management, an
environmental protection system, and embedded error detection and repair features that
automatically detect, isolate, and repair problem areas that may develop over the extended use
of the hard drive. With these enhanced data reliability features, the drive can perform more
accurate monitoring, error repair, and deliver exceptional data security.
Hot Plug Support — SATA supports hot plugging (also known as “hot swapping”), the ability
to swap out a failed hard drive without having to power down the system or reboot. This
capability contributes to both data availability and serviceability without any associated
downtime, making it a critical feature for extending SATA into enterprise applications.
Active LED Status — These drives support external LED requirements. It provides an activity
LED output which is ON during command execution and OFF otherwise.
Fluid Dynamic Bearings (FDB) — Bearing design that incorporates a layer of high-viscosity
lubricant instead of ball bearings in the hard drive spindle motor. As an alternative to
conventional ball bearing technology, FDB designs provide increased non-operational shock
resistance, speed control, and improved acoustics.
Staggered Spin-Up — Native SATA feature that allows the system to control whether the drive
will spin up immediately or wait until the interface is fully ready.
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CacheFlow™ —HGST’s unique, multi-generation caching algorithm evaluates the way data is
read from and written to the drive and adapts “on-the-fly” to the optimum read and write caching
methods. CacheFlow minimizes disk seek operations and overheads due to rotational latency.
CacheFlow supports sequential and random write cache. With write cache and other CacheFlow
features, the user can cache both read and write data. The cache can hold multiple writes and collectively write them to the hard drive.
48-bit Logical Block Addressing (LBA) — HGST SATA drives support both 48-bit and 28-bit
LBA and CHS-based addressing. LBA is included in advanced BIOS and operating system
device drivers and ensures high capacity disk integration.
Power Management — HGST SATA drives support the ATA and Serial ATA power
management command set, allowing the host to reduce the power consumption of the drive by
issuing a variety of power management commands.
Automatic Defect Retirement — If the HGST SATA drive detects a defective sector while
reading, writing, or performing offline data collection, it automatically relocates the sector
without end-user intervention.
Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.) — S.M.A.R.T. enables a
drive’s internal status to be monitored through diagnostic commands at the host level and
during offline activities. S.M.A.R.T. devices employ data analysis algorithms that are used to
predict the likelihood of some near-term degradation or fault conditions. When used with a
S.M.A.R.T. application, the drive can alert the host system of a negative reliability status
condition. The host system can then warn the user of the impending risk of data loss and
recommend an appropriate action.
ATA Security — HGST SATA drives support the ATA Security Mode Feature set. The ATA
Security Mode feature set allows the user to create a device lock password that prevents
unauthorized hard disk access even if the drive is removed from the host computer. The
correct password must be supplied to the hard drive in order to access user data. Both the User
and Master Password features are supported, along with the High and Maximum security
modes. The Master Password Revision code is also supported.
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2.0CHARACTERISTICS
2.1Performance Characteristics
Average Seek
- Read
- Write
Rotational Speed7200 RPM
Data Transfer Rate (maximum)
- Interface Speed
- Sustained data transfer rate at OD
Buffer Size32 MB
Error Rate - Unrecoverable<1 in 10
Spindle Start Time
- From Power-on to Drive Ready
- From Power-on to Rotational Speed
Spindle Stop Time8s average
Load/Unload Cycles
1
During continuous Seek, Read, or Write commands, an algorithm in the code will add latency as required to keep
the VCM motor from overheating. Seek performance will be impacted under this condition.
2
As used for storage capacity, one megabyte (MB) = one million bytes, one gigabyte (GB) = one billion bytes, and
one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment. As
used for buffer or cache, one megabyte (MB) = 1,048,576 bytes. As used for transfer rate or interface, megabyte
per second (MB/s) = one million bytes per second, and gigabit per second (Gb/s) = one billion bits per second.
Effective maximum SATA 6 Gb/s transfer rate calculated according to the Serial ATA specification published by
the SATA-IO organization as of the date of this specification sheet. Visit www.sata-io.org for details.
3
Defined as the time from power-on to the setting of Drive Ready and Seek Complete including calibration.
4
Defined as the time from power-on to when the full spindle rotational speed is reached.
5
Controlled unload at ambient condition.
1
12.0 ms average
14.0 ms average
2
6 Gb/s
163 MB/s
14
bits read
3
4
5
3.8s average
2.0s average
600,000
HGST Hard Disk Drive Technical Reference Manual
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2.2Physical Characteristics
Physical
HGST HTS725050B7E630
Specifications
Capacity
InterfaceSATA 6 Gb/s
Actuator TypeRotary Voice Coil
Number of Disks1
Physical bytes per Sector4096
Host bytes per Sector512
User Sectors per Drive976,773,168
Servo TypeEmbedded
Recording Method LDPC Target
1
1
As used for storage capacity, one megabyte (MB) = one million bytes, one gigabyte (GB) = one billion bytes,
and one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating
environment. As used for buffer or cache, one megabyte (MB) = 1,048,576 bytes. As used for transfer rate or
interface, megabyte per second (MB/s) = one million bytes per second, and gigabit per second (Gb/s) = one
billion bits per second. Effective maximum SATA 6 Gb/s transfer rate calculated according to the Serial ATA
specification published by the SATA-IO organization as of the date of this specification sheet. Visit www.sataio.org for details.
500,107MB
2.2.1Physical Dimensions
EnglishMetric
DimensionToleranceDimensionTolerance
Height0.27 inches±0.01 inch6.8 mm±0.20 mm
Length3.94 inches±0.01 inch100.20 mm±0.25 mm
Width2.75 inches±0.01 inch69.85 mm±0.25 mm
Weight
(typical)
0.20 lb—92 gm—
HGST Hard Disk Drive Technical Reference Manual
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2.3Mechanical Characteristics
Figure 2-1 shows the mounting dimensions and locations of the screw holes for the drive.
Figure 2-1. Mounting Dimensions
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2.4Electrical Characteristics
2.4.1Current Requirements and Power Dissipation
Operating Mode
Spinup (max)1.1A5.5W
Read (average)400 mA2.0W
Write (average)400 mA2.0W
Seek (average)420 mA2.1W
POWER MANAGEMENT COMMANDS
Operating Mode
Idle - Performance Mode
(average)
Idle - Active Mode (average)237 mA1.18W
Idle - Low Power Mode (average)170 mA0.85W
Standby (average)50 mA0.25W
Sleep (average)50 mA0.25W
1
All values are typical (25°C and 5V input) except where specified as maximum.
Current
5 VDC
Current
5 VDC
1
1
370 mA1.85W
Power
Power
1
1
2.4.2Input Voltage Requirements
The input voltage requirement for these drives is +5.0V ± 5%.
2.4.3Ripple
+5 VDC
Maximum
Frequency
100 mV (peak-to-peak)
10 KHz - 30 MHz
2.4.4ESD
The ESD specification compliance is determined at room ambient conditions with nominal power
supply settings, unless otherwise specified.
Op-System LevelMinimum
Direct contact discharges8 kV
Direct air discharges15 kV
Indirect contact discharges (VCP & HCP)8 kV
Indirect air discharges (VCP & HCP)15 kV
Non-Op Driv e Level
Direct contact discharges8 kV
Direct air discharges15 kV
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2.5Environmental Characteristics
2.5.1Shock and Vibration
Table 2-1. Shock and Vibration
Shock
Operating (2 ms)400G
Non-operating (2 ms)1000G
Note: Half-sine wave, measured without shock isolation and without non-recoverable errors.
Vibration
Operating
Non-operating
1
2.2 Grms, measured using random write/read ratio of 1:3 at block size of 256
2
5.8 Grms
Drive Generated Vibration
Operating (average)0.17 gm-mm
Rotational Shock
Operating (2 ms)3.5K rad/sec
Non-operating (2 ms)50K rad/sec
1
2
Operating Vibration
Drives are tested by applying a random or swept sinusoidal excitation in each linear axis, one axis
at a time. The drive incurs no physical damage and no hard errors while operating and subjected to
continuous vibration not exceeding the level listed in Table 2-1. Operating performance may
degrade during periods of exposure to continuous vibration.
Note: This specification applies to handling and transportation of unmounted drives.
Drives are tested by applying a random or swept sinusoidal excitation in each linear axis, one axis
at a time. The drive incurs no physical damage when subjected to continuous vibration not
exceeding the level listed in Table 2-1.
Drive Generated Vibration
Drives are tested by supporting a single drive horizontally in a free-free state and measuring the
side-to-side vibration. Self vibration may not exceed the level listed in Table 2-1.
Rotational Shock Non-Operating
Drives are tested by applying a rotational force centered around the actuator pivot. The drive incurs
no physical damage when subjected to the rotational force specified in Table 2-1.
Packaged Shock and Vibration
The shipping packaging is designed to meet the National/International Safe Transit Association
(N/ISTA) standards for packaged products. The drive incurs no physical damage when subjected to
the N/ISTA standards.
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2.5.2Temperature and Humidity
Operation
Min-Max Base Casting
Temperature
Humidity8-90% RH non-condensing
Thermal Gradient20C/hour (maximum)
Humidity Gradient20%/hour (maximum)
1
0C to 60C (32°F to 140°F)
29.4C (maximum wet bulb)
Non-Operation
Non-operating Temperature-40°C to 65°C (-40°F to 149°F)
Humidity5-95% RH non-condensing
Thermal Gradient30C/hour (maximum)
Humidity Gradient20%/hour (maximum)
1
The system environment must allow sufficient air flow to limit maximum base casting temperatures as defined in
Figure 2-2 below.
40C (maximum wet bulb)
2.5.3Thermocouple Location
ComponentLocation
Drive base casting#1, Figure 2-2
Figure 2-2. Drive Base Casting Thermocouple Location
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2.5.4Cooling
If forced air cooling is required, the drive must be positioned to receive airflow from one or more
fans as indicated in Figure 2-3.
Figure 2-3. Forced Airflow Direction
2.5.5Atmospheric Pressure
Altitude
Operating-1,000 feet to 10,000 feet (-305m to 3,048m)
Non-operating-1,000 feet to 40,000 feet (-305m to 12,192m)
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2.5.6Electromagnetic Field/Magnetic Field Immunity
Test LevelFrequency Range
5 V/m100 Khz to 200 MHz
5 GaussDC to .200 MHz
1 Gauss.200 Mhz to .400 MHz
.005 Gauss.400 Mhz to 20 MHz
2.5.7Operating Drive DC Magnetic Field Susceptibility
Drive level operational magnetic DC field susceptibility:
160 Gauss outside shaded area
40 Gauss inside shaded area in all magnetic field directions
Figure 2-4. Operating Drive DC magnetic Field Susceptibility
2.5.8Acoustics
TYPICAL SOUND POWER LEVEL
Idle Mode (average dBA)
Seek Mode (average dBA)
1
Measured per ECMA-74/ISO 7779.
2
No audible pure tones.
3
Random seek at a rate of 26 seeks per second.
2
3
1
23
25
2.5.9RoHS (Restriction of Hazardous Substances)
HGST hard drive products manufactured and sold worldwide after June 8, 2011, meet or exceed
Restriction of Hazardous Substances (RoHS) compliance requirements as mandated by the RoHS
Directive 2011/65/EU. RoHS aims to protect human health and the environment by restricting the
use of certain hazardous substances in new equipment, and consists of restrictions on lead,
mercury, cadmium, and other substances.
HGST Hard Disk Drive Technical Reference Manual
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