Seagate Enterprise Capacity 3.5 HDD/Constellation ES Constellation ES (.1) SA - Page 11

Default Logical Geometry Recording And Interface Technology Physical Characteristics Seek Time

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2.3 DEFAULT LOGICAL GEOMETRY CYLINDERS 16,383 READ/WRITE HEADS SECTORS PER TRACK 16 63 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. 2.4 RECORDING AND INTERFACE TECHNOLOGY Interface Recording method Recording density, KBPI (Kb/in max) Track density, KTPI (ktracks/in avg) Areal density (Gb/in2 avg) Spindle speed (RPM) (± 0.2%) Internal data transfer rate (Mb/s max) Sustained data transfer rate (MB/s max) I/O data-transfer rate (MB/s max) Serial ATA (SATA) Perpendicular 1523 237 324 7200 1300 152 600 (Ultra DMA mode 5) 2.5 PHYSICAL CHARACTERISTICS Weight: (maximum) 2TB models 1TB models 500GB models Cache buffer 710g (1.565 lb) 640g (1.411 lb) 610g (1.345 lb) 64MB (64,768KB) 2.6 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 5000 measurements of seeks between random tracks, less overhead. Table 2: *Typical seek times (ms) Track-to-track Average Average latency: Read 0.5

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C
ONSTELLATION
ES S
ERIAL
ATA P
RODUCT
M
ANUAL
, R
EV
. F
6
2.3
D
EFAULT LOGICAL GEOMETRY
C
YLINDERS
R
EAD
/
WRITE HEADS
S
ECTORS PER TRACK
16,383
16
63
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
.
2.4
R
ECORDING AND INTERFACE TECHNOLOGY
Interface
Serial ATA (SATA)
Recording method
Perpendicular
Recording density, KBPI (Kb/in max)
1523
Track density, KTPI (ktracks/in avg)
237
Areal density (Gb/in
2
avg)
324
Spindle speed (RPM) (± 0.2%)
7200
Internal data transfer rate (Mb/s max)
1300
Sustained data transfer rate (MB/s max)
152
I/O data-transfer rate (MB/s max)
600 (Ultra DMA mode 5)
2.5
P
HYSICAL CHARACTERISTICS
Weight: (maximum)
2TB models
710g (1.565 lb)
1TB models
640g (1.411 lb)
500GB models
610g (1.345 lb)
Cache buffer
64MB (64,768KB)
2.6
S
EEK 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 5000 measurements of seeks between random tracks, less overhead.
Table 2:
*Typical seek times (ms)
Read
Write
Track-to-track
0.5
0.8
Average
<8.5
<9.5
Average latency:
4.16
*Measured in performance mode.
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.