Hitachi HTS543280L9A300 사용자 설명서

 

 

5K320 SATA OEM Specification 

 

19 

Command Type 

Typical (ms) 

Max. (ms) 

Read 

12 

14 

Write 

13 

15 

Table  5. Mechanical positioning performance

 

Typical and Max. are defined throughout the performance specification as follows: 

Typical 

Average of the drive population tested at nominal environmental and voltage conditions. 

Max. 

Maximum value measured on any one drive over the full range of the environmental and 
voltage  conditions. (See section 6.1, "Environment" and section 6.2, "DC power 
requirements" ) 

The seek time is measured from the start of motion of the actuator to the start of a reliable read or write 
operation. A reliable read or write operation implies that error correction/recovery is not em ployed to 
correct arrival problems. The Average Seek Time is measured as the weighted average of all possible 
seek combinations. 

 

 

 

max.

 

 

 

 

Σ

 (max. + 1 – n)(Tn

i n

 + Tn

out

) 

 

 

 

n=1

 

Weighted Average = –––––––––––––––––––––––––––– 
 

 

 

(max. + 1)(max) 

 
Where: max. 

= maximum seek length 

                        n   = seek length (1-to-max.) 
            Tn

in 

= inward measured seek time for an n-track seek 

            Tn

out 

= outward measured seek time for an n-track seek 

Command Type 

Typical (ms) 

Max. (ms) 

Read 

20.0 

25 .0 

Write 

21.0 

26 .0 

Table  6. Full stroke seek time

 

Full stroke seek time in milliseconds is the average time of 1000 full stroke seeks. 

Command Type 

Typical (ms) 

Maximum (ms) 

Read 

1.0 

2.0 

Write 

1.1 

2.2 

Table  7. Single track seek time 

Single track seek is measured as the average of one (1) single track seek from every track in both 
directions (inward and outward). 

(RPM) 

(ms) 

(ms) 

5400 

11.1  

5.5 

Table  8. Latency time