Seagate Desktop HDD Product Manual - Page 13

www.seagate.com Drive Specifications 2.5 Physical characteristics Maximum height 3TB, 2TB and 1.5TB 26.1mm / 1.028 in 1TB, 750GB, 500GB, 320GB, 250GB 19.98mm / 0.787 in Maximum width (all models) 101.6mm / 4.0 in (± 0.010 in) Maximum length (all models) 146.99mm / 5.787 in Typical weight 3TB and 2TB 626g / 1.38 lb 1.5TB 535g / 1.18 lb 1TB and 750GB 400g / 0.88 lb 500GB, 320GB, 250GB 415g / 0.92 lb Cache buffer 3TB, 2TB, 1.5TB, 1TB, 750GB 64MB (64,768kb) 500GB, 320GB and 250GB 16MB (16,384kb) 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. Typical seek times (ms) Track-to-track Average Average latency Read 1.0 8.5 Write 1.2 9.5 4.16 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. Seagate Desktop HDD Product Manual, Rev. J 9