Hitachi DK23EA Specifications - Page 20

Single HDD Test Condition

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4.2.2 Single HDD Test Condition To optimize the performance, keep the following instructions. 1) For the Single HDD test, HDD should be placed on an ABS-sheet. HDD should be place with no movement by external force min. 0.39N for X axis and Y-axis directions. 2) Don't place HDD on a soft sponge sheet or hard surface at HDD test. If the HDD is placed on the soft sponge sheet or slippery hard desk surface, the HDD has unstable conditions such as HDD self-vibration at seek operations or spindle motor rotation. It may cause performance reduction or some errors. Also, HDD floating by tension of I/F cabling may cause the similar symptom. The HDD should be placed without any floating. Don't test the HDD under these unstable conditions. 3) If the HDD cannot be fixed by the required holding torque above item 1), put a body weight on the HDD as shown in Figure 4-3. The body weight is provided for preventing the HDD movement or HDD floating by tension of I/F cabling. (70) (13) Use the body weight as specified below. Material : SS41 with ELP-coat Weight : M=0.66kg (92) Inertia : I=7.3X10 kg m Y Axis Direction Weight SS41 with Insulation sheet (m=0.66kg, I=7.3X10-4 kg m2 ) HDD X Axis Direction K6602637 Rev.3 02.27.01 ABS-sheet (t = 5mm) Figure 4-3 Single HDD Test Condition - 20 -

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K6602637
Rev.3
02.27.01
- 20 -
4.2.2 Single HDD Test Condition
To optimize the performance, keep the following instructions.
1) For the Single HDD test, HDD should be placed on an ABS-sheet. HDD should be place with
no movement by external force min. 0.39N for X axis and Y-axis directions.
2) Don
’
t
place HDD on a soft sponge
sheet or hard surface at HDD test. If the HDD is placed on
the soft sponge sheet or slippery hard desk surface, the HDD has unstable conditions such as HDD
self-vibration at seek operations or spindle motor rotation. It may cause performance reduction or
some errors.
Also, HDD floating by tension of I/F cabling may cause the similar symptom. The HDD
should be placed without any floating. Don
’
t test the HDD under these unstable conditions.
3) If the HDD cannot be fixed by the required holding torque above item 1),
put a
body weight on the
HDD as shown in Figure 4-3. The body weight is provided for preventing the HDD movement or HDD
floating by
tension of I/F cabling.
Use the body weight as specified below.
Material : SS41 with ELP-coat
Weight
: M=0.66kg
Inertia
: I=7.3X10
kg m
Figure 4-3
Single HDD Test Condition
Y Axis Direction
X Axis Direction
(70)
(13)
(92)
Weight
SS41 with Insulation sheet
(m=0.66kg, I=7.3X10
kg m
)
-4
2
HDD
ABS-sheet
(t = 5mm)