HGST Ultrastar 7K2, Техническое справочное руководство

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Ultrastar 7K2
HGST Hard Disk Drive Technical Reference Manual
9
S
PECIFICATION
Table 1 Physical Specifications
Physical Specifications
1
HUS722T2TALA604 HUS722T1TALA604
Capacity 2 TB 1 TB
Interface SATA 6 Gb/s SATA 6 Gb/s
Physical Bytes Per Sector 512 512
Host Bytes Per Sector 512 512
User Sectors per Drive 3,907,029,168 1,953,525,168
Servo Type Embedded Embedded
Channel Recording Method LDPC–Low Density Parity Code
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 document. Visit www.sata-
io.org for details.
Performance Specifications
Table 2 Performance Specifications
Average Seek (without overhead)
- Read
- Write
7.7 ms average
8.3 ms average
Average Latency 4.2 ms (nominal)
Rotational Speed 7200 RPM (nominal)
Data Transfer Rate (maximum at OD)
1
- Maximum burst interface transfer rate
- Maximum sustained interface transfer rate
6 Gb/s
HUS722T2TALA604: 200 MB/s
HUS722T1TALA604: 184 MB/s
Buffer Size 128 MB
Spindle Start Time
- From Power-on to Drive Ready
2
15s average (FAST spinup mode)
18s average (STANDARD spinup mode)
Spindle Stop Time <10s average
Load/Unload Cycles
3
600,000 minimum
1
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 document. Visit www.sata-io.org
for details.
2
Defined as the time from power-on to the setting of Drive Ready and Seek Complete including calibration.
Controlled unload at ambient condition.