Справочник Пользователя для Seagate 7200.11

Скачать
Страница из 46
Barracuda 7200.11 Serial ATA Product Manual, Rev. B
9
2.4
Physical characteristics  
2.5
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.  
*Measured in performance mode.
**Measured in quiet 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.
Maximum height 
1000 & 640 GB models
26.1 mm (1.028 inches)
320 & 160 GB models
20.17 mm (0.794 inches)
Maximum width
101.6 mm (4.000 +/- 0.010 inches)
Maximum length
146.99 mm (5.787 inches)
Typical weight
1000 GB models
677 grams (1.493 lbs)
640 GB models
543 grams (1.199 lbs)
320 & 160 GB models
368 grams (0.811 lbs)
Cache buffer
ST31000333AS & ST3640323AS
32 Mbytes (32,768 kbytes)
ST3320613AS
16 Mbytes (16,384 kbytes)
ST3320813AS and ST3160813AS
  8 Mbytes (8,192 kbytes)
Typical seek times (msec)
Read 
Write 
Track-to-track 
<1.0
<1.2
Average (1000 & 640 GB models)
<8.5
<9.5
Average (320 & 160 GB models)
<11.0
<12.0
Average latency:
4.16