Cautions When Handling Hdd - Hitachi DV-DS163E Service Manual

Safety Precaution for Repair > Cautions When Handling HDD (Hard Disk Drive)
1-4 Cautions When Handling HDD (Hard Disk Drive)
HDD is a high precision device, and is very susceptible to vibrations or impact. Even if HDD
operates normally immediately after it has been subjected to vibrations or impact, a problem may
occur after it is used for a while: When servicing, take great care with the following.
There are two types of HDD: CSS format (head remains on disk regardless of operation status)
and ramp loading format (head moves away from disk during no operation). The impact resistance
characteristics are slightly different for the two. When servicing, observe the following cautions
regardless of the format:
(1) Cautions during unpacking
1) Do not subject the HDD to any impact when placing on desk: The head hitting against the desk
could result in damage.
2) If condensation occurs because of the environment, leave the HDD without being turned on for at
least 3 hours until it adapts to surrounding environment. If the HDD is turned on while the head
is sticking to disk because of condensation, the disk may be damaged.
(2) Cautions during transportation
An HDD is more susceptible to vibrations or impact when it is turned on or operating than during
no operation.
1) Do not move the HDD while it is turned on: If the HDD is subject to any impact while the disk is
rotating, i.e., the head hitting against the disk, breakage could result.
2) Move the HDD approximately 2 minutes (approximately 30 seconds for surveillance system
devices) after turning it off and unplugging its power cord from AC outlet. The disk will still be
rotating by inertia immediately after the HDD is turned off: Subjecting the HDD to movement at
this time could destroy it.
(3) Cautions during operation
1) Do not unplug the power cord from AC outlet during operation: This could damage the data on
HDD. Be sure to turn the HDD off before unplugging the power cord.
2) Do not hit the HDD: The head hitting the disk could result in breakage.
(4) Caution during packing
1) Use the packing material of relevant model: Material superior in impact resistance is used. Using
other packing materials could result in fault.
(5) Cautions when handling unassembled HDD
1) Hold the HDD at both sides so that the circuit board surface is facing below: Holding the HDD at
the top and bottom could cause the head to drift, which could result in fault.
2) Do not touch the terminal or pattern on circuit board.
3) Place HDD on a spot where cushion is pasted with the circuit board surface facing below.
4) Do not hold or place stacked HDDs.
5) Do not drop or hit HDD against anything: Dropping HDD from even 5 mm high on a work bench
with high stiffness could cause fault.
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