Recording And Interface Technology; Physical Characteristics; Seek Time - Seagate Enterprise Capacity 2.5 HDD Constellation Product Manual

3.4

Recording and interface technology

Interface
Recording method
Recording density, KBPI (Kb/in max)
Track density, KTPI (Ktracks/in avg)
2
Areal density (Gb/in 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)
3.5

Physical characteristics

Weight: (
maximum)
1TB models
500GB models
250GB models
Cache buffer
Note. Refer to Figure 6, page 26 for detailed mounting configuration dimensions.
3.6

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 5,000 measurements of seeks between
random tracks, less overhead.
*Typical seek times (ms)
Track-to-track
Average
Full Stroke
Average latency:
*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.
8
All models
Serial ATA (SATA)
Perpendicular
1544
270
417
7200
1304
115
600
200 g (0.441 lb)
183 g (0.403 lb)
179 g (0.395 lb)
64 Mbytes (65,536 KB)
Read
0.23
7.5
17.06
4.16
Constellation.2 Serial ATA Product Manual, Rev. F
Write
0.44
8.5
18.08