JP2010123216A - Magnetic disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic disk device capable of measuring and recording an environmental change for each magnetic disk device without being supplied with a power from the outside. <P>SOLUTION: The magnetic disk device, involved in one embodiment, includes: a semiconductor integrated circuit 2 where a first measuring circuit for measuring a first physical quantity to be applied to the magnetic disk drive 1 to create first measurement data, a second measuring circuit for measuring a second physical quantity to create second measurement data, a clock circuit 300 for periodically supplying timing signals with a predetermined interval, a nonvolatile memory 220 for storing the first measurement data and their measured period by making them to be corresponded and storing the second measurement data and their measured period by making them to be corresponded, and a control circuit 200 for controlling fetch timings of the first measurement data and second measurement data in accordance with the timing signals, are integrated on a substrate; and a battery 3 for supplying the power to the semiconductor integrated circuit 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device that measures physical quantities due to changes in environment (temperature, humidity, impact, etc.).

  Some conventional magnetic disk devices have a function of detecting temperature, impact, and the like (Patent Documents 1 to 3). Patent Document 1 describes a magnetic disk device that monitors the life of a disk by measuring the operating time during which the power is on and the temperature during operation.

  Patent Document 2 describes a magnetic disk device including a temperature sensor for measuring the temperature inside the disk and an impact sensor for measuring an impact applied to the disk. Patent Document 3 describes an information processing apparatus that includes a temperature sensor, an atmospheric pressure sensor, an acceleration sensor, and the like, and performs switching between a disk device and a nonvolatile semiconductor memory according to environmental conditions.

  It is important to record changes in the environment (temperature, humidity, impact, etc.) applied to the magnetic disk device regardless of whether the power of the magnetic disk device is turned on or off in order to investigate the cause of the failure of the magnetic disk device. is there.

  However, the conventional magnetic disk device cannot monitor environmental changes in a state where power is not supplied to the disk device. In Patent Documents 1 and 2, the disk device does not have a power backup function, and it is not possible to record environmental changes in a state where power is not supplied.

Further, in Patent Document 3, it is an object to perform control for guaranteeing data consistency and continuation of processing when switching between a disk device and a semiconductor memory. Therefore, the control is performed when the power of the magnetic disk device is turned on, and the change of the environmental condition when the power is turned off cannot be recorded.
JP 2003-068008 A JP 2005-71068 A JP 2006-338691 A

  As described above, in conventional magnetic disk devices, it is unclear how changes in the environment (temperature, humidity, impact, etc.) applied to the magnetic disk device, particularly when the power is turned off, affect the quality of the magnetic disk device. there were.

  The inventor has also invented a disk array device having a function of measuring and recording changes in the environment without receiving external power supply. However, even if the environment changes in one disk array device, the environment changes in each magnetic disk device differ depending on the location where each magnetic disk device is mounted. For example, the impact on the disk array device applied during an earthquake disaster is different for each magnetic disk device. For this reason, there is a problem that it is impossible to measure and record environmental changes to individual magnetic disk devices.

  The present invention has been made against the background of such circumstances, and an object of the present invention is to provide a magnetic that can measure and record environmental changes for each magnetic disk device without receiving external power supply. It is to provide a disk device.

  A magnetic disk device according to an aspect of the present invention measures a first physical quantity applied to the magnetic disk device, measures a first measurement circuit that generates first measurement data, and measures a second physical quantity applied to the magnetic disk device, A second measurement circuit for generating second measurement data; a clock circuit for measuring time and supplying a timing signal periodically at a predetermined interval; and a time at which the first measurement data and the first measurement data are measured And a storage circuit that stores the second measurement data and the time at which the second measurement data was measured in association with each other, the first measurement data according to the timing signal, and the second A control circuit for controlling the timing of capturing measurement data includes a semiconductor integrated circuit integrated on a substrate, and a battery for supplying power to the semiconductor integrated circuit.

  According to the present invention, it is possible to provide a magnetic disk device capable of measuring and recording environmental changes for each magnetic disk device without receiving power supply from the outside.

  A magnetic disk device according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a configuration of a magnetic disk device 1 according to the present embodiment. As shown in FIG. 1, the magnetic disk device 1 includes a semiconductor integrated circuit 2 and a battery 3.

  The semiconductor integrated circuit 2 detects and measures physical quantities due to changes in the environment (temperature, humidity, impact, etc.) applied to the magnetic disk device 1. The battery 3 supplies power to each part of the conductor integrated circuit 2. That is, the semiconductor integrated circuit 2 can operate even when power is not supplied from the outside. In FIG. 1, solid arrows indicate signal transmission paths, and broken arrows indicate power supply paths.

  Here, the semiconductor integrated circuit 2 will be described in detail. The semiconductor integrated circuit 2 is provided with a temperature sensor 110, a temperature measurement circuit 111, a humidity sensor 120, a humidity measurement circuit 121, an impact sensor 130, an impact measurement circuit 131, a control circuit 200, and a clock circuit 300. These circuits are integrated on one printed circuit board.

  The temperature sensor 110 detects the temperature of the environment where the magnetic disk device 1 is used. The temperature signal 110 a detected by the temperature sensor 110 is input to the temperature measurement circuit 111. The temperature measurement circuit 111 measures the environmental temperature based on the temperature signal 110a and generates temperature data 111a. The temperature measurement circuit 111 sends the temperature data 111 a to the control circuit 200 in response to the temperature data capture signal 200 a from the control circuit 200.

  The humidity sensor 120 detects the humidity of the environment where the magnetic disk device 1 is used. The humidity vibration 120 a detected by the humidity sensor 120 is input to the humidity measurement circuit 121. The humidity measurement circuit 121 measures the environmental humidity based on the humidity signal 120a and generates humidity data 121a. The humidity measurement circuit 121 sends the humidity data 121 a to the control circuit 200 in response to the humidity data capture signal 200 b from the control circuit 200.

  The impact sensor 130 detects the impact received on the magnetic disk device 1. If there is an impact exceeding the reference, the impact sensor 130 inputs an impact signal 130 a to the impact measurement circuit 131. The impact measurement circuit 131 measures the magnitude of impact based on the impact signal 130a, generates impact data 131a, and sends it to the control circuit 200. Temperature data 111a, humidity data 121a, and impact data 131a are taken as measurement data.

  The control circuit 200 includes a CPU 210 and a nonvolatile memory 220. The CPU 210 performs measurement data recording processing. The clock circuit 300 counts time, generates date / time data 300 a indicating the measured time, and supplies it to the control circuit 200. The clock circuit 300 generates a timing signal at a predetermined interval and supplies it to the control circuit 200. Based on this timing signal, the CPU 210 generates a temperature data capture signal 200a and a humidity data capture signal 200b.

  Next, the operation of the magnetic disk device 1 shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a flowchart for explaining the operation of the magnetic disk device 1 according to the present embodiment. As shown in FIG. 2, first, it is determined whether or not the temperature data capture signal 200a and the humidity data capture signal 200b are input to the temperature measurement circuit 111 and the humidity measurement circuit 121 (step S10). When the temperature data capture signal 200a and the humidity data capture signal 200b are input (YES in step S10), the temperature measurement circuit 111 measures the temperature, and the humidity measurement circuit 121 measures the humidity (step S20). The measured temperature data 111a and 121a are recorded in the nonvolatile memory 220 of the control circuit 200 together with the date / time data 300a input from the clock circuit 300 (step S30).

  If the temperature data capture signal 200a and the humidity data capture signal 200b are not input (step S10 NO), it is determined whether or not there is an impact signal (step S40). When the impact signal 130a exceeding the reference value is input from the impact sensor 130 (step S40 YES), the impact data 131a is stored in the nonvolatile memory 220 of the control circuit 200 together with the date / time data 300a (step S50).

  If the impact signal 130a exceeding the reference value is not input from the impact sensor 130 (NO in step S40), it is determined whether or not the environmental data capture signal 200d is input from the magnetic disk device 1 or its upper controller ( Step S60). When the environmental data capture signal 200d is input (YES in step S60), the control circuit 200 transmits the environmental data 200c stored in the nonvolatile memory (step S70). In the present embodiment, the environmental data 200c includes temperature data, humidity data, impact data, and date / time data.

  Here, a specific operation of the magnetic disk device 1 according to the present invention will be described with reference to FIG. FIG. 3 is a timing chart for explaining a specific operation of the magnetic disk device 1 according to the present embodiment. Here, it is assumed that the timing signals are generated at intervals of 30 minutes, and the temperature data capture signal 200a and the humidity data capture signal 200b are generated at intervals of 30 minutes.

  As shown in FIG. 3, in T0 to T1, the control circuit 200 controls the temperature signal 111a and the humidity measurement circuit 121 from the temperature measurement circuit 111 according to the temperature data capture signal 200a and the humidity data capture signal 200b at intervals of 30 minutes. Humidity signal 121a from is taken into nonvolatile memory 220.

  Further, the impact signal 130a of the impact sensor 130 generated at an arbitrary time T3 and T4 exceeds the impact reference. Therefore, the impact measurement circuit 131 captures the peak value P1 of the impact signal 130a at time T3 and the peak value P2 of the impact signal 130a at time T4 into the nonvolatile memory 220 of the control circuit 200 as impact data 131a.

  Note that the impact signal 130a generated at time T5 does not reach the impact reference. For this reason, the peak value P3 of the impact signal 130a at time T5 is not taken into the nonvolatile memory 220 as impact data.

  Then, the control circuit 200 sends out the environmental data 200c stored in the recorded nonvolatile memory 220 by the environmental data capture signal 200d generated at time T6.

  As described above, in the present invention, the physical quantity (temperature, humidity, impact, etc.) (environmental change) applied to the magnetic disk device 1 can be automatically recorded regardless of whether the magnetic disk device 1 is turned on or off. . Thereby, it is possible to leave a history of environmental changes over time. For example, it is possible to always measure and record changes in the environment with respect to the magnetic disk device, such as the distribution process of the magnetic disk device, when the user is operating or stopped, or during an earthquake disaster. For this reason, the cause of the malfunction of the magnetic disk device 1 can be investigated, and quality can be easily ensured.

  In the present invention, a circuit for automatically recording changes in the environment (temperature, humidity, impact, etc.) with time is integrated on one printed circuit board. By downsizing as described above, the magnetic disk device 1 can be mounted.

  In the present embodiment, three sensors, a temperature sensor, a humidity sensor, and an impact sensor, are provided as examples of means for detecting a physical quantity applied to the magnetic disk device 1, but the present invention is not limited to this. For example, it is possible to provide an atmospheric pressure sensor that measures atmospheric pressure, a vibration sensor, an acceleration sensor, or the like.

1 is a diagram showing a configuration of a magnetic disk device according to an embodiment. 4 is a flowchart for explaining the operation of the magnetic disk device according to the embodiment. 6 is a timing chart for explaining the operation of the magnetic disk device according to the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic disk apparatus 2 Semiconductor integrated circuit 3 Battery 110 Temperature sensor 111 Temperature measurement circuit 120 Humidity sensor 121 Humidity measurement circuit 130 Impact sensor 131 Impact measurement circuit 200 Control circuit 210 CPU
220 Nonvolatile memory 300 Clock circuit

Claims (5)

A first measurement circuit for measuring a first physical quantity applied to the magnetic disk device and generating first measurement data;
A second measurement circuit for measuring a second physical quantity applied to the magnetic disk device and generating second measurement data;
A clock circuit for measuring time and supplying a timing signal periodically at predetermined intervals;
A storage circuit for storing the first measurement data and the time when the first measurement data is measured in association with each other, and storing the second measurement data and the time when the second measurement data is measured in association with each other; ,
A control circuit for controlling the capture timing of the first measurement data or the second measurement data according to the timing signal;
A semiconductor integrated circuit integrated on a substrate;
A magnetic disk device comprising: a battery for supplying power to the semiconductor integrated circuit.   The magnetic disk device according to claim 1, wherein the control circuit stores the first measurement data in the storage circuit when the timing signal is supplied.   The control circuit stores the second measurement data in the storage circuit when determining that the second physical quantity is equal to or greater than a predetermined threshold when the timing signal is not supplied. Item 3. The magnetic disk device according to Item 1 or 2.   4. The magnetic disk device according to claim 1, wherein the measurement circuit is at least one of a temperature sensor and a humidity sensor.   The magnetic disk device according to claim 1, wherein the measurement circuit is at least one of an impact sensor and a stress sensor.

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