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6.2 Maintenance Information
C141-E235 6-5
(1) Interface (loop) test
The operations of the loop and data buffer on the HDD are checked with the WRITE BUFFER and
READ BUFFER commands.
(2) Basic operation test
The basic operations of the HDD are checked by executing self-diagnosis with the SEND
DIAGNOSTIC command (see Subsection 6.1.1).
(3) Random/sequential read test
The positioning (seek) operation and read operation are tested in random access and sequential
access modes with the READ, READ EXTENDED, or VERIFY command.
(4) Write/read test
By using a data block in the internal test space, the write/read test can be executed with an arbitrary
pattern for a disk drive in which user data is stored.
6.2 Maintenance Information
6.2.1 Precautions
Take the following precautions to prevent injury during maintenance and troubleshooting:
1. To avoid injury, do not touch the mechanical assembly during disk drive
operation.
2. Do not use solvents to clean the disk drive.
Take the following precautions to prevent disk drive damage during maintenance and
troubleshooting:
1. Always ground yourself with a wrist strap connected to ground before
handling. ESD (Electrostatics Discharge) may cause the damage to the
device.
2. Do not remove a PCA.
3. Do not use a conductive cleaner to clean a disk drive assembly.