摘要:
An explosion-proof battery includes a cover unit fit into an open portion of a cylindrical cup-like casing. The cover unit is electrically connected to a lead tab extended from an electricity generating unit installed in the casing. The cover unit includes a metal terminal plate of relatively high rigidity, a pressure sensitive plate in the form of a metal plate having relatively high flexibility and vulnerability, a fixing plate of insulating material, an electrical conductive member including an upwardly projecting portion and a base portion, and a ring-shaped gasket of insulating material. The terminal plate and the fixing plate have respective vent holes. The electrical conductive member and the pressure sensitive plate are connected to each other at a connecting portion on the projecting portion of the conductive member by welding. A tip end portion of the lead tab is connected to the base portion of the conductive member. When the pressure sensitive plate expands outwardly due to an extreme increase of the inner pressure, the conductive member is pulled upwardly with the pressure sensitive plate in the vicinity of the connecting portion thereof and is broken to cut off the current path between the lead tab and the terminal plate.
摘要:
One code (a compressed redundant code) is created based on a plurality of first redundant codes, each created on the basis of a plurality of data units, and this compressed redundant code is written to a nonvolatile storage area. This compressed redundant code is used to restore either a data element constituting a multiple-failure data, or a first redundant code corresponding to the multiple-failure data, which is stored in an unreadable sub-storage area of a partially failed storage device, and to restore the data element constituting the multiple-failure data which is stored in a sub-storage area of a completely failed storage device, based on the restored either data element or first redundant code, and either another data element constituting the multiple-failure data or the first redundant code corresponding to the multiple-failure data.
摘要:
A disk array system having first and second housings and a controller for controlling the first and second housings. Fiber channel hard disk drives are received in the first housing, and serial ATA hard disk drives are received in the second housing. When reading data stored in a serial ATA hard disk drive in the second housing, the controller reads a plurality of pieces of data including the data to be read and parity data for the plurality of pieces of data from all the hard disk drives of an RAID group to which the hard disk drive storing the data to be read belongs. Thus, the controller examines whether the plurality of pieces of data including the data to be read are written in the hard disk drives with erroneous contents or not.
摘要:
A disk array system having first and second housings and a controller for controlling the first and second housings. Fiber channel hard disk drives are received in the first housing, and serial ATA hard disk drives are received in the second housing. When reading data stored in a serial ATA hard disk drive in the second housing, the controller reads a plurality of pieces of data including the data to be read and parity data for the plurality of pieces of data from all the hard disk drives of an RAID group to which the hard disk drive storing the data to be read belongs. Thus, the controller examines whether the plurality of pieces of data including the data to be read are written in the hard disk drives with erroneous contents or not.
摘要:
In a magnetic recording drive having a plurality of magnetic heads each employing a magnetoresistive sensor for the purpose of averaging the time required for sense currents to be caused to flow through the respective magnetoresistive sensors to shorten the longest reproducing time and to suppress the degradation of the characteristics due to the electromigration, thereby improving the reliability of the magnetic recording drive, the magnetic recording drive includes circuits for averaging the useful life depending on the currents caused to flow through the respective magnetoresistive sensors among the plurality of magnetic heads, whereby the time required for the sense current to be caused to flow through one MR reproducing head is greatly shortened. Therefore, the levels of outputs of the MR reproducing heads can be increased without reduction of the reliability and thus the reliability of the magnetic recording drive can be improved.
摘要:
An electronic apparatus, such as a disk apparatus, has a plurality of electronic units such as magnetic head-disk units and at least one power source unit for supplying power to the electronic units. The arrangement of the electronic apparatus is such that, on a frame of the apparatus, the plurality of electronic units are vertically arranged in such a manner as to form a first arrangement system, while the at least one power source unit is arranged in such a manner as to form a second arrangement system above the first arrangement system. The apparatus has an air flow passage for causing cooling air to flow from a lower portion of the electronic apparatus to the inside thereof, pass through the first arrangement system, thereby pass through the second arrangement system, and then be discharged to the outside of the apparatus. This arrangement enables cooling air to flow in a simplified manner, which in turn enhances the cooling efficiency, and also enables electrically connecting cables to be arranged in a simple wiring system.
摘要:
Because of increase in data recording density on a magnetic disk in recent years, a minute defect which posed no problem in the past exerts adverse influence upon the recording and reproducing characteristics. An object of the present invention is to provide a method and an apparatus for detecting minute defects on a magnetic disk. In order to achieve this object, the present invention was made on the basis of the recognition that a large defect on the magnetic disk largely decreases the amplitude of the reproduced signal and shifts its phase, whereas a small defect does not decrease the amplitude of the reproduced signal so largely but causes a phase shift. Therefore, defects on the magnetic disk are detected by monitoring the amplitude decrease and phase shift of the reproduced signal.
摘要:
The storage system includes a first controller adapted to transfer/receive data to/from a host computer and to receive/transfer data from/to first type drive units via a first type interface of the first controller; a second controller adapted to transfer/receive data to/from the host computer and/or another host computer and to receive/transfer data from/to the first type drive units via a first type interface of the second controller, the first type drive units each having a converter and a first type drive, the converter converting between a first type protocol and a second type protocol, the first type drive having a second type interface and storing data converted to the second type protocol by the converter; and an expansion housing including the first type drive units. Each of the first type drive units are coupled to both the first and second controllers.
摘要:
The disk array system includes a first controller adapted to transfer/receive data to/from a host computer and to receive/transfer data from/to first type disk drive units via a first type interface of the first controller; a second controller adapted to transfer/receive data to/from the host computer and/or another host computer and to receive/transfer data from/to the first type disk drive units via a first type interface of the second controller, the first type disk drive units each having a converter and a first type disk drive, the converter converting between a first type protocol and a second type protocol, the first type disk drive having a second type interface and storing data converted to the second type protocol by the converter; and an expansion housing including the first type disk drive units. Each of the first type disk drive units are coupled to both the first and second controllers.
摘要:
A disk array system having first and second housings and a controller for controlling the first and second housings. Fiber channel hard disk drives are received in the first housing, and serial ATA hard disk drives are received in the second housing. When reading data stored in a serial ATA hard disk drive in the second housing, the controller reads a plurality of pieces of data including the data to be read and parity data for the plurality of pieces of data from all the hard disk drives of an RAID group to which the hard disk drive storing the data to be read belongs. Thus, the controller examines whether the plurality of pieces of data including the data to be read are written in the hard disk drives with erroneous contents or not.