Seagate DiamondMax 23 250-GB SATA STM3250318AS Manual Do Utilizador

Códigos do produto
STM3250318AS
Página de 48
DiamondMax 23 Serial ATA Product Manual, Rev. C
11
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.  
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.
2.6
Start/stop times
Maximum height (1000 and 750 GB models)
26.1 mm (1.028 inches)
Maximum height (500, 320, 250 and 160 GB models)
19.98 mm (0.787 inches)
Maximum width
101.6 mm (4.000 +/- 0.010 inches)
Maximum length
146.99 mm (5.787 inches)
Typical weight
1000 and 750 GB models
622 grams (1.371 lbs)
500, 320, 250 and 160 GB models
415 grams (0.915 lbs)
Cache buffer
1000 - 750 GB models
32 Mbytes (32,768 kbytes)
500 and 320 GB models
16 Mbytes (16,384 kbytes)
250 and 160 GB models
  8 Mbytes (16,384 kbytes)
Typical seek times (msec)
Read 
Write 
Track-to-track
<1.0
<1.2
Average
<8.5
<9.5
Average latency:
4.16
1000 and 750 GB models
500, 320, 250 and 160 GB models
Power-on to Ready (typ / max sec)
<10.0
<8.5
Standby to Ready (typ / max sec)
<10.0
<8.5
Ready to spindle stop (typ / max sec)
10