JPH0397187A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent various problems due to thermal deviation of position of heads in an HDA (Head Disk Assembly) caused by a fault of a cooling device by driving the cooling devices alternately at normal times and driving the other cooling device when one cooling device is faulty so as to keep the device cooling capability constant. CONSTITUTION:Each HDA 20 is provided with fan motors 41, 42 as a 1st cooling section and fan motors 52, 51 as a 2nd cooling section to form a 1st cooler 40 comprising sets of the fan motors 41, 42 and to form a 2nd cooler 50 comprising sets of the fan motors 52, 51. The 1st and 2nd coolers 40, 50 are driven alternately for each prescribed period normally to cool the HDA 20. When one of the 1st and 2nd coolers 40, 50 is faulty during the alternate drive, the cooling device of the faulty cooler is stopped and the other cooler is driven continuously. Thus, the cooling capability in the magnetic disk device is kept constant and the thermal deviation of position of heads in the HDA 20 is not caused.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a magnetic disk device in which a magnetic disk drive section is cooled by a plurality of cooling devices.

[Prior Art] Conventionally, there is a magnetic disk device as shown in FIG. This includes a power supply unit 10 and a magnetic disk drive unit (rHDA (Head Disk Asse).
mbly) 20), a control circuit section 30 for controlling the HDA 20, and a cooling device 40. The cooling device 40 operates all the fan motors 41 and 42 provided for each HDA 20 under the control of the cooling device control circuit 70 to blow air to the HDA 20 to cool the heat generated inside the magnetic disk device. controlled to do so.

[Problems to be Solved by the Invention] However, in the conventional magnetic disk device described above, since the control method is such that the fan motors 41 and 42 of the cooling device 40 are all operated simultaneously, for example, If even one of the plurality of fan motors 41, 42 fails, the cooling capacity decreases and the temperature inside the HDA 20 increases. In general, the inside of an HDA20 is made up of multiple mechanical parts that have been processed in a super-dense manner, so when the temperature inside the HDA20 changes, the difference in the coefficient of thermal expansion of each of the above mechanical parts causes , resulting in thermal misalignment. In particular, relative positional deviation occurs between the servo head used to position the magnetic disk to a desired track and the data head used for data writing/reading operations, and if the amount of positional deviation exceeds a certain level, read errors occur frequently. .

Also, if a write operation is performed in such a state, the data will be written outside the normal track center position.
Even if the cooling device was subsequently repaired, it still had major drawbacks, such as the fact that data written when the cooling device failed could no longer be read, and in the worst case, existing data would be destroyed.

[A thousand steps to solve the problem] The means of the present invention for solving such problems is to mount a plurality of magnetic disk drive units in one housing, and connect the magnetic disk drive units to a plurality of cooling devices. In this magnetic disk device, a first cooling section and a second cooling section are provided for each magnetic disk drive section, respectively, to constitute a first cooling device consisting of a set of first cooling sections, and a first cooling section is configured. If a second cooling device is configured with a set of two cooling sections, and both of the cooling devices are operated simultaneously, the device has twice the cooling capacity that is actually required, and the first and second cooling devices are The cooling devices are operated alternately at regular intervals, and when one of the first or second cooling devices fails, the failed cooling device is stopped and the other cooling device is operated continuously, It is equipped with a cooling device control circuit that controls the cooling capacity within the device to be kept constant.

[Embodiment] Hereinafter, a magnetic disk device according to an embodiment of the present invention will be described based on the accompanying drawings.

As shown in FIG. 1, the magnetic disk device according to the embodiment includes HD A2 as a plurality of magnetic disk drive units.
0 is mounted in one housing, and the HDA 20 is cooled by a plurality of fan motors for blowing air, and each HDA
Each fan motor 41.20 serves as a first cooling section.
42 and a fan motor 52.51 as a second cooling unit are provided to monitor the first cooling device 40 consisting of a set of fan sweaters 41.42, and the fan motor 52,
A second cooling device 50 consisting of a set of 51 is configured, and if the cooling devices are operated simultaneously, the magnetic disk device has twice the air volume capacity actually required. The cooling systems 40 and 50 are operated alternately at regular intervals, and when one of the first or second cooling system i40, 50 fails, the cooling system of the failed system is stopped and the other system is cooled. It has a cooling device control circuit 60 that switches the device to continuous operation and controls the internal cooling capacity of the magnetic disk device to be kept constant. Further, this magnetic disk device includes a control circuit section 30 that controls the HDA 20, and also includes a power supply device 10 that processes the AC power source 1 and supplies power to the cooling device control circuit and the control circuit section 30. .

Therefore, according to the magnetic disk device according to the embodiment, the first and second cooling devices are normally operated alternately at regular intervals,
Cooling of HDA20 is performed. Also, if one of the first or second cooling devices 40, 50 fails during this alternate operation, the cooling device of the failed system is stopped,
Switch the other cooling device to continuous operation. Thereby, the cooling capacity within the magnetic disk device is kept constant.

[Effects of the Invention] As explained above, according to the magnetic disk device of the present invention, the magnetic disk device has a cooling capacity twice that normally required.
Two sets of cooling equipment are provided, and these two sets of cooling equipment are normally operated alternately at a fixed cycle, and when one cooling equipment fails, the failed cooling equipment is stopped and the other cooling equipment is operated continuously. This makes it possible to maintain a constant cooling capacity within the device, making it especially useful for HDD caused by cooling device failure.
This has the effect of preventing various problems caused by thermal misalignment within A.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a magnetic disk device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional magnetic disk device. 10: Power supply device 20: HDA 30: Control circuit section 40: First cooling device 50: Second cooling device 41, 42, 51, 52: Fan motor 60, 70: Cooling device control circuit

Claims (1)

[Claims] A magnetic disk device in which a plurality of magnetic disk drive units are mounted in one housing and the magnetic disk drive units are cooled by a plurality of cooling devices, wherein each magnetic disk drive unit has a first cooling unit and a second cooling unit, respectively. If a first cooling device is configured by a set of first cooling units and a second cooling unit is configured by a set of second cooling units, and both cooling units are operated at the same time, The cooling capacity of the device is twice that actually required, the first and second cooling devices are operated alternately at regular intervals, and the cooling capacity of the first or second cooling device is A magnetic disk characterized in that it is equipped with a cooling device control circuit that, when one of the cooling devices fails, stops the failed cooling device and continuously operates the other cooling device to maintain a constant cooling capacity within the device. Device.