Shock resistant, high reliability rotating magnetic storage device
AssigneeHitachi Global Technologies Netherlands B.V.
InventorsMasashi Kisaka, Yutaka Ozawa, Kenji Toga
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Abstract
A rotating storage apparatus is provided for high recording reliability in an environment in which a shock or vibration exists. Provided are means for outputting a shock out signal (SO) if an output from an acceleration sensor exceeds a predetermined threshold, a latch circuit 21 for outputting a latch signal at high level during a predetermined write inhibit period after the shock out signal (SO) is input, and a write gate signal (WG) which goes high when a write is enabled. A write enable signal is generated by an AND circuit 23 having a NOT output of the latch signal as well as the write gate signal WO as its inputs.
Claims28
A storage apparatus, comprising:
- a rotating recording medium for recording information;
- a mechanism for performing at least a write operation onto said rotating recording medium;
- and,
- an acceleration sensor for detecting a shock,
- wherein if an output from said acceleration sensor exceeds a predetermined threshold, said write operation is inhibited during a write inhibit period,
- wherein a duration of said write inhibit period is selected based at least in part on a time span in which said acceleration sensor output exceeds said threshold.
A storage apparatus comprising:
- a rotating recording medium for recording information;
- a mechanism for performing at least a write operation onto said rotating recording medium;
- and,
- an acceleration sensor for detecting a shock,
- wherein if an output from said acceleration sensor exceeds a predetermined threshold, said write operation is inhibited during a write inhibit period,
- wherein a duration of said write inhibit period is selected based at least in part on one or more of:
- a time span in which said acceleration sensor output exceeds said threshold, a peak value of said acceleration sensor output, and a waveform of said acceleration sensor output;
- wherein said write inhibit period is selected by varying a predetermined fixed time period based at least in part on said time span in which said acceleration sensor output exceeds said threshold.
A storage apparatus comprising:
- a rotating recording medium for recording information;
- a mechanism for perfomring at least a write operation onto said rotating recording medium;
- and,
- an acceleration sensor for detecting a shock,
- wherein if an output from said acceleration sensor exceeds a predetermined threshold, said write operation is inhibited during a write inhibit period,
- wherein a duration of said write inhibit period is selected based at least in part on one or more of:
- a time span in which said acceleration sensor output exceeds said threshold, a peak value of said acceleration sensor output, and a waveform of said acceleration sensor output;
- a mechanism for monitoring an output from said acceleration sensor, and, if said monitored output exceeds a predetermined threshold, outputting a shock out signal;
- a latch mechanism for outputting a latch signal at a first level during said write inhibit period from a time at which said shock out signal is input;
- a write gate signal generation mechanism for outputting a write gate signal at the first level when a write permission is given;
- and
- a logic circuit enabling a write onto said rotating recording medium when said latch signal is at a second level other than said first level and when said write gate signal is at the first level.
A storage apparatus, comprising:
- a rotating recording medium for recording information;
- a mechanism for performing at least a write operation onto said rotating recording medium;
- an acceleration sensor for detecting a shock, said acceleration sensor providing output upon detecting a shock;
- a mechanism for monitoring an output from said acceleration sensor, and outputting a shock out signal based on said acceleration sensor output;
- a latch mechanism for outputting a latch signal at a first level during a write inhibit period from a time at which said shock out signal is input, wherein said write inhibit period is selected based on said output of said acceleration sensor;
- a write gate signal generation mechanism for outputting a write gate signal at the first level when a write permission is given;
- and
- a logic circuit enabling a write onto said rotating recording medium when said latch signal is at a second level other than said first level and when said write gate signal is at the first level.
An information recording method in a rotating storage apparatus comprising a rotating recording medium for recording information, a head for performing at least a write operation onto said rotating recording medium, and an acceleration sensor for detecting a shock, said method comprising:
- outputting a shock out signal if an output from said acceleration sensor exceeds a predetermined threshold;
- outputting continuously a signal at a first level during a write inhibit period in response to the input of said shock out signal, wherein a duration of said write inhibit period is selected based at least in part on one or more of:
- a time span in which said acceleration sensor output exceeds said threshold, a peak value of said acceleration sensor output, and a waveform of said acceleration sensor output;
- generating a logical AND signal of a logical negation signal of the signal at a first level and a write gate signal output, said write gate signal output being at the first level when a write permission is given;
- and
- enabling a write onto said rotating recording medium when said logical AND signal is at the first level.
Dependencies are inferred from the claim text.