Seagate ST31000525SV, ST3250311SV manual Physical characteristics, Seek time, Start/stop times

2.5Physical characteristics

	1 TB model	500 GB model	250 GB model
Maximum height	26.1 mm (1.028 inches)		20.20 mm (0.794 inches)
Maximum width	101.85 mm (4.010 inches)
Maximum length	146.99 mm (5.787 inches)
Typical weight	677 grams (1.493 lb.)	544 grams (1.199 lb.)	380 grams (0.838 lb.)
Cache buffer	16 Mbytes (16,384 kbytes)		8 Mbytes (8,192 kbytes)

2.6Seek 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.

	1 TB and 500GB model		250 GB models
Typical seek times (msec)*	Read	Write	Read	Write
Track-to-track	<0.5	<1.5	<1.0	<1.2
Average	<8.5	<9.5	<8.5	<9.0

*Measured in Seek 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.

2.7Start/stop times

	1TB and 500GB models	250 GB models
Power-on to Ready (sec)	<10 (max)	<8 (max)
Ready to spindle stop (sec)	12 (max)

Note. Start/stop measurements are taken with nominal power at 25°C ambient temperature.

SV35.5 Series SATA Product Manual, Rev. A 9