Hitachi HTS725050A9A364 Datasheet download pdf (Page 19)

7K500 OEM SPECIFICATION

Page 19 of 176

4.4.2

4.4.24.4.2

4.4.2

Mechanical positioning

Mechanical positioningMechanical positioning

Mechanical positioning

4.4.2.1

4.4.2.14.4.2.1

4.4.2.1 Average seek

Average seek Average seek

Average seek time (including settling)

time (including settling)time (including settling)

time (including settling)

Command Type Typical (ms) Max. (ms)

Read/Write 12 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" on page 23 and section 6.2, "DC power

requirements" on page 25)

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 employed to

correct arrival problems. The Average Seek Time is measured as the weighted average of all possible

seeks combination.

max.

Σ (max. + 1 – n)(Tn

+ Tn

out

)

n=1

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

(max. + 1)(max)

Where: max. = maximum seek length

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

= inward measured seek time for an n-track seek

out

= outward measured seek time for an n-track seek

4.4.2.2

4.4.2.24.4.2.2

4.4.2.2 Full stroke seek

Full stroke seek Full stroke seek

Full stroke seek

Command Type Typical (ms) Max. (ms)

Write 22.0 29.0

Table 6. Full stroke seek time

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

4.4.2.3

4.4.2.34.4.2.3

4.4.2.3 Single track seek time (without command overhead, including

Single track seek time (without command overhead, including Single track seek time (without command overhead, including

Single track seek time (without command overhead, including

settling)

settling)settling)

settling)

Command Type Typical (ms) Maximum (ms)

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).

4.4.2.4

4.4.2.44.4.2.4

4.4.2.4 Average latency

Average latency Average latency

Average latency

Rotational Speed

(RPM)

Time for one revolution

(ms)

Average Latency

(ms)

7200 8.3 4.2

Table 8. Latency time

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 175 176

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Hitachi HTS725050A9A364 Datasheet Page 19

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