Appeal No. 95-1308
Application 07/999,502
voltage, means responsive to the read back signal for determining clearance
between the read and write transducer and the recording medium;
a device controller having access to a clock and the
plurality of operating condition monitoring devices and receiving indications
of error from the processing means for generating a plurality of types of
operating records;
a non-volatile, non-moving storage connected to the
device controller for receiving the operating records and for storing the operating
records sorted by type into partitions of the non-volatile, non-moving storage,
the partitions including a main partition for storage of cumulative operating
statistics, a secondary partition for logging time stamped operating condition
records and a last in last out partition for storing time stamped error occurrence
records; and
an external connection port to the non-volatile,
non-moving storage allowing read access to the partitions while bypassing the
device controller.
12. A method of logging operating statistics for a disk drive unit for use in error analysis,
the method comprising the steps of:
clocking power on time of the disk drive unit;
periodically recording power on time in a main
partition of a non-volatile, non-moving storage device;
responsive to occurrence of error upon access to a
moving media within the disk drive unit, making an error record of such
occurrence in a last in last out partition of the non-volatile, non-moving
storage including a time stamp, ambient temperature, output voltage for a
power supply to the disk drive, mechanical vibration of the disk drive, and
clearance between a storage medium and a read and write transducer;
tracking access time periods to locations for data
records on the storage medium;
responsive to occurrence of error upon access of the
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