Seagate ST9500621SS Constellation SATA Product Manual - Page 15

Physical characteristics, Seek time, Start/stop times

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3.5 Physical characteristics Weight: (maximum) ST9500530NS ST9160511NS Cache buffer 196 grams (0.43 lbs) 188 grams (0.41 lbs) 32 Mbytes (32,768 kbytes) Note. Refer to Figure 5, page 23 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 (msec) Track-to-track Average Full Stroke Average latency: Read 0.5 8.0 17.4 4.16 Write 0.7 8.4 17.9 *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. 3.7 Start/stop times Power-on to Ready (sec) Standby to Ready (sec) Ready to spindle stop (sec) ST9500530NS 20 (max) 6 (max) 20 (max) ST9160511NS 4 (max) Constellation Serial ATA Product Manual, Rev. D 9

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Constellation Serial ATA Product Manual, Rev. D
9
3.5
Physical characteristics
Weight: (maximum)
ST9500530NS
196 grams (0.43 lbs)
ST9160511NS
188 grams (0.41 lbs)
Cache buffer
32 Mbytes (32,768 kbytes)
Note.
Refer to Figure 5, page 23 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 (msec)
Read
Write
Track-to-track
0.5
0.7
Average
8.0
8.4
Full Stroke
17.4
17.9
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.
3.7
Start/stop times
ST9500530NS
ST9160511NS
Power-on to Ready (sec)
20 (max)
Standby to Ready (sec)
6 (max)
4 (max)
Ready to spindle stop (sec)
20 (max)