JPH11328826A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the protection of held information even at the time of disconnection of an interface and to reduce electric power consumption by detecting the connection state of the interface, updating the information on the registered interface state management table and changing the operation state of a disk device by the updated information. SOLUTION: A microprocessor 10 executes the initialization on respective sections upon turning on of a power source and forms the interface state management table on a work memory. The microprocessor puts a host interface control section 15 into an operation state by setting the connection states of the first port and second port of the interface state management table at 'under connection'. When the connection of either of an interface transceiver 17 or 18 is cut off, the operation state is set at an 'IF-ON state' and does not change but the connection states of the first port or the second port of the interface state management table is rewritten to a 'absence of connection'. When both of the interface transceivers 17 and 18 are cut off, the disk device is shifted to a 'low electric power consumption state'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device as an external storage device of a computer, and more particularly to a technology of a disk device for monitoring a connection state between the computer and the disk device.

[0002]

2. Description of the Related Art In a conventional disk drive, an operating state of a disk drive such as a spindle motor for rotating a disk, a servo motor for head positioning, and a signal processing circuit, such as driving or stopping of a disk drive unit in the disk drive, is controlled by a host device. The power consumption is controlled by specifying with the command from.

In an optical disk device or the like in which a recording medium can be exchanged, a recording medium removal prohibition state is set by a command from the host so that the host device does not remove the recording medium during data recording and reproduction.

[0004]

In a conventional disk device, when the connection of the interface between the disk device and the host device is physically disconnected or logically closed,
Cannot receive commands from host. Therefore, it is not possible to shift the disk device to a low power consumption state in which the drive unit of the disk device itself is stopped or to cancel the recording medium removal prohibition state without damaging the data held in the disk device. There is a problem.

An object of the present invention is to solve the above two problems when the connection of the interface between the disk device and another device including the host device is disconnected.

[0006]

According to the present invention, when the connection of the interface is disconnected, the disk device itself can solve the problem by changing the operation state of the disk device.

More specifically, a detecting means for detecting the connection state of the interface, and the registered other device in the interface status management table in which information on the presence / absence of connection between the disk device and the other device are registered. Update means for updating the information on the presence or absence of connection with the result of the detection means, and when the information on the presence or absence of connection with another device registered in the interface state management table is updated by the update means, Changing means for changing the operation state of the disk device is provided in the disk device.

With this configuration, when a physical or logical disconnection of the interface connection is detected, the state shifts to a power consumption reduction state such as a motor off without waiting for a command from another device including the host device. Can be.

Further, the second problem of the present invention is solved by releasing the removal prohibition state of the removable storage medium when the connection of the interface is disconnected.

Specifically, detecting means for detecting a connection state of the interface, and prohibition of removal of the removable storage medium when the disconnection of the interface with the other device is detected by the detecting means. Means for canceling the state are provided in the disk device.

With this configuration, upon detecting a physical or logical disconnection of the connection of the interface, the disk device checks the current recording medium availability state, and does not wait for a command from another device including the host device. The removal prohibition of the recording medium can be released.

As described above, even if the connection of the interface is disconnected, the power consumption of the disk device can be reduced without destroying the data in the disk device. Further, even if the connection of the interface is disconnected, the recording medium can be taken out.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below.

FIG. 1 is a configuration diagram of a computer system according to the present invention. The computer system includes a host device 20, a magnetic disk device 1, an optical disk device 30, and a magnetic disk device 50. The magnetic disk device 1 and the magnetic disk device 50 have the same configuration, and are devices to which the present invention is applied. The optical disk device 30 is also a device to which the present invention is applied.

The magnetic disk drive 1 includes a magnetic disk 2
, A magnetic head 3, a spindle motor 4, a head servo motor 5, and a read / write channel 12 (hereinafter referred to as R
Indicated as W-CH. ) And a microprocessor (hereinafter M
Notated as PU. 10), a work memory 11, a hard disk control unit (hereinafter, referred to as HDC) 13, a buffer memory 14, a host interface control unit (hereinafter, referred to as IF-CTL) 15, and a motor control unit 16.
And an interface transceiver (hereinafter, IF-XC)
Recorded as V. ) 17 and 18 and a DC power supply 19. The magnetic disk 2 magnetically stores data, and the magnetic head 3 records and reproduces data on the magnetic disk 2. The spindle motor 4 rotates the magnetic disk 2. The head servomotor 5 supports the magnetic head 3 and moves the magnetic head 3 in the radial direction of the magnetic disk 2. The RW-CH 12 is used to perform modulation for magnetic recording of data and the magnetic head 2 during data recording.
Is performed to amplify the signal from the magnetic head 3 at the time of data reproduction and discriminate between digital values of "1" and "0". The HDC 13 includes the RW-CH 12 and the buffer memory 1
4, data transfer between the IF-CTL 15 and the buffer memory 14, error correction of reproduced data, and control of the data format on the magnetic disk 1 such as addition of a data error correction code. The buffer memory 14
The recording / reproduction data is temporarily stored. IF-CTL15
Controls the host interface, and transmits and receives commands for instructing a recording / reproducing operation and recording / reproducing data to and from the host device 20 or another device. I
The F-XCVs 17 and 18 perform level conversion in transmission and reception of the host interface signal and detect disconnection of the interface. The motor control unit 16 controls the head servomotor 5
To control the movement of the magnetic head 3 and the positioning to the fixed position. The MPU 10 controls command interpretation and operation of other parts. The work memory 11 stores control information used by the MPU 10. The DC power supply 19 supplies an operating current to each component. In this embodiment, the IEEE 1394 high-speed serial bus standard is used as the interface standard.

The host device 20 is also provided with an IF-XCV 21. The other configuration is a normal host device, and the description of the implementation of the present invention is omitted because it does not depend on the details of the configuration.

FIG. 2 is a block diagram of the IF-XCV. I
F-XCV is divided into two parts. One is the A port 60 and one is the B port 70. The A port 60 includes a differential bus driver 61, a differential bus receiver 62, terminating resistors 63 and 64, a bias power supply 65 for supplying a common terminal voltage, and input / output terminals 66 and 67. The positive side of the differential signal is an AP terminal 66,
The negative side is the AN terminal 67.

The B port 70 is a differential bus driver 71
, A differential bus receiver 72, termination resistors 73 and 74,
A ground resistor 75 at the end, resistors 76 and 77 for detecting a common voltage of the differential signal, a voltage comparator 78 for detecting a common voltage of the differential signal, and a voltage source 79 for supplying a reference voltage of the voltage comparator 78 And input / output terminals 81 and 82. The positive side of the differential signal is the BP terminal 81, and the negative side is the BN terminal 82.

The construction of the IF-XCV is the IF-XCV shown in FIG.
XCV 17 and 18, 21 and 43 and 44 are all the same. Two IF-XCVs are opposingly connected, and one A port and the other B port having the same polarity terminals are connected. For example, in the case of the connection between the host device 20 and the magnetic disk device 1, the AP terminal of the IF-XCV 21 is connected to the IF-XCV21.
BP terminal of XCV17, AN terminal of IF-XCV21, BN terminal of IF-XCV17, IF-XCV21
Terminal, IF terminal of IF-XCV17, IF terminal
The BN terminal of the XCV 21 and the AN terminal of the IF-XCV 17 are respectively connected.

The connection state of the interface is detected as follows.

When the interface is connected,
The voltage from the bias power supply 65 of another device having the IF-XCV is supplied to the BP terminals 81 and B of the magnetic disk device through the resistors 63 and 64 and the interface signal line.
Applied to the -N terminal 82; The voltage comparator 78 in the magnetic disk drive detects through the resistors 76 and 77 that the voltage at the BP terminal 81 and the BN terminal 82 is higher than the voltage of the reference voltage source 79, and the connection state of the interface. Is set to true.

When the interface signal line is disconnected,
The supply of the voltage from the bias power supply 65 in the other device is stopped. The BP terminals 81 and B-
Since the N terminal 82 is grounded by the resistors 73, 74 and 75, the average voltage of the BP terminal 81 and the BN terminal 82 becomes almost 0V. The voltage comparator 78 in the magnetic disk drive detects through the resistors 76 and 77 that the voltage at the BP terminal 81 and the BN terminal 82 is lower than the voltage of the reference voltage source 79, and the connection state of the interface is determined. Is false, and the disconnection of the interface is displayed.

Here, as the disconnection of the interface, it is assumed that the signal cable connecting the terminals is disconnected from the terminal or the signal line itself is disconnected.

In the magnetic disk drive 1, Aout shown in FIG.
The signal, A-enable signal, Ain signal, Bout signal, B-enable signal and Bin signal are IF-CN
Connected to T15. The connection signal Connect is MPU
10 and IF-CNT15.

FIG. 3 is a diagram showing the configuration of a table for managing the state of an interface in the magnetic disk device 1 (hereinafter, referred to as an interface state management table). This table is used by the MPU 10 and is stored in the work memory 11. A port number is assigned to each implemented IF-XCV, whether or not each port is connected to another device is stored in the connection status column, and whether a host device exists in the connection destination device in the connection device type column. Whether or not is stored. The first port is IF-X
The second port corresponds to IF-XCV18, corresponding to CV17.

Next, the operation related to the disconnection of the interface will be described with reference to FIG. FIG. 4 is a diagram showing transition of the operation state of the magnetic disk device 1. When the device is turned on (111), the magnetic disk device 1 enters the "low power consumption state" 101 first. In this state, only the MPU 10, the work memory 11, and the IF-XCVs 17 and 18 operate,
Other parts have stopped working.

When the power is turned on, the MPU 10 initializes each unit, and also creates an interface state management table shown in FIG. 3 in the work memory. At this point, all ports are in the unconnected state.

When the initialization is completed, the MPU 10 checks the interface connection state using the connection signal Connect from the IF-XCVs 17 and 18. In the configuration of FIG. 1, since the two ports are connected to another device, the MP
U10 determines that “there is a connection port” (112), and transitions the operation state to the “IF-ON state” 102. MPU
10 is the first port and 2 of the interface status management table
Set the connection status column of the port No. to “Connecting” and set the IF-CTL
15 is put into the operating state. If at this point IF-XC
If the connection of either V17 or V18 is disconnected, the other connection is maintained (114), and the operation state remains unchanged in the "IF-ON state" 102, but the interface state management table The column of the connection status of the first or second port is rewritten to “no connection”.
When both the IF-XCVs 17 and 18 are disconnected, there is no connected port (113), so the state transits to the “low power consumption state” 101, the IF-CTL 15 is stopped, and the interface state All ports in the management table are in the unconnected state.

When a command is received from the host device 20 in the "IF-ON state" 102 (115), the MPU 10
Changes the operation state to the “host connection state” 103. The MPU 10 changes the connection device type column of the port (referred to as a host port) on the side receiving the command in the interface state management table to “host device”.

In the "host connection state" 103, when all host ports are disconnected and there are no more host ports (11
5), the operation state transits to the “IF-ON state” 102.

In the "host connection state" 103, when a host port is partially disconnected and there is another host port (11
8), the operation state remains unchanged as the “host connection state” 103, but the columns of the connection device type and the connection state of the disconnected port in the interface state management table are rewritten to “others” and “no connection”, respectively. .

When a new command is received from a port other than the host port in the “host connection state” 103 (1
16) The operation state remains unchanged as the “host connection state” 103, but the connection device type column of the port on the side receiving the new command in the interface state management table is changed to “host device”.

The MPU 10 interprets the received command,
If it is the “motor start command”, the operation state is further shifted to the “recording / reproducing state” 104. In the "recording / reproducing state" 104, the spindle motor 4, the head servo motor 5, the RW-CH 12, the HDC 13, the buffer memory 14, and the motor control unit 16 are also in the operating state.
If the first command received in the “IF-ON state” 102 is the “motor START command”, the operation state is shifted to two stages even with one command.

In the "recording / reproducing state" 104, the "motor ST
Upon receiving the “OP command” (120), the MPU 10 changes the operation state to the “host connection state” 103. M
The PU 10 includes a spindle motor 4, a head servo motor 5, an RW-CH 12, an HDC 13, and a buffer memory 14.
And the motor control unit 16 is stopped.

In the "recording / reproducing state" 104, when all host ports are disconnected and there are no more host ports (12
3), the operation state transits to the “IF-ON state” 102. The MPU 10 stops the spindle motor 4, the head servo motor 5, the RW-CH 12, the HDC 13, the buffer memory 14, and the motor control unit 16, and completes the connection device type column corresponding to the disconnected host port in the interface state management table. Rewrite to "Other".

In the "recording / reproducing state" 104, when the host port is partially disconnected and there is another host port (12
2) The operation state remains unchanged in the “recording / reproducing state” 104, but the columns of the connected device type and the connection state of the disconnected port in the interface state management table are rewritten to “other” and “no connection”, respectively. .

When a new command is received from a port other than the host port in the "recording / reproducing state" 104 (12
1) The operation state remains unchanged in the "recording / reproducing state" 104, but the connection device type column of the port on the side receiving the new command in the interface state management table is changed to "host device".

In the "recording / reproducing state" 104, if the interface is disconnected while data is being read or written, the above-described state transition is performed after performing the following processing.

During data reading, if the port connected to the read requesting host device is disconnected, the MPU 1
0 indicates reading of data from the magnetic disk 2 and the host device 2
Then, the transfer to 0 is stopped, and the last sector address of the recording sector that has been transferred to the host device and the information for identifying the host device are stored in the work memory 11. After the reconnection, if there is a request from the host device 20, the magnetic disk device 1 transmits information of the interrupted process to the host device.

If the port connected to the host device 20 that has issued the write request is disconnected during data writing, the MPU 10 immediately suspends data transfer from the host device 20. Furthermore, of the received data,
The data that has been received in units of recording sectors is
Then, the last sector address of the sector which has been written to the magnetic disk 2 and the information for identifying the host device are stored in the work memory 11. After the reconnection, the information of the process interrupted by the magnetic disk device 1 is transmitted to the host device in response to a request from the host device, thereby facilitating post-processing of the transfer interruption due to the interface disconnection.

As described above, in this embodiment, when the interface is disconnected, the motor and the recording / reproducing circuit are stopped, so that even if a host command cannot be received, power consumption can be suppressed. .

Next, a second embodiment of the present invention will be described. The optical disk device 30 of FIG. 1 is a second embodiment.

The optical disk device 30 includes an optical disk 31
, An optical pickup 33, a spindle motor 32,
Optical disk attaching / detaching mechanism 34, RW-CH 38, MPU
36, a work memory 37, an optical disk control unit (hereinafter referred to as ODC) 39, a buffer memory 40,
IF-CTL41, motor control unit 42, IF-XC
V43 and 44, a DC power supply 45, and an optical disk ejection switch 46. The optical disk 31 stores data and is detachable from the optical disk device 30.
The optical pickup 33 records and reproduces data on the optical disk 31 using light, and moves the focal point of the recording and reproducing light in the radial direction of the optical disk 31. The spindle motor 32 rotates the optical disc 31. The RW-CH 38 modulates data for optical recording and drives the optical pickup 33 at the time of data recording, and amplifies a signal from the optical pickup 33 at the time of data reproduction, and discriminates between digital values of “1” and “0”. Do. The ODC 39 performs data transfer between the RW-CH 38 and the buffer memory 40, data transfer between the IF-CTL 41 and the buffer memory 40, error correction of reproduced data,
It controls the data format on the optical disk 31, such as adding a data error correction code. Buffer memory 40
Temporarily stores the recording / reproducing data. IF-CTL
Reference numeral 41 controls a host interface, and transmits and receives a command for instructing a recording and reproducing operation and recording and reproducing data to and from the host device 20 or another device. The motor control unit 42 drives the optical pickup 33, and controls the movement of the focal point of the recording / reproducing light and the positioning to the fixed position. The MPU 36 controls interpretation of commands and operations of other parts. The work memory 37 stores control information used by the MPU 36. The DC power supply 45 supplies an operating current to each component. Optical disk eject switch 46
Is a push button switch for requesting the operator to take out the optical disk from the optical disk device 30.

The IF-XCVs 43 and 44 perform level conversion during transmission and reception of the host interface signal and detect disconnection of the interface, and are the same as those in FIG. 2 of the first embodiment. In the optical disk device 30, Aout in FIG.
The signal, A-enable signal, Ain signal, Bout signal, B-enable signal and Bin signal are IF-CN
Connected to T41. Interface signal Cone
ct is connected to the MPU 36 and the IF-CNT 41.

FIG. 6 is a diagram showing the structure of a table for managing the state of the interface in the optical disk device 30. This table is used by the MPU 36 and stored in the work memory 37. A port number is assigned to each implemented IF-XCV, whether or not each port is connected to another device is stored in the connection status column, and whether a host device exists in the connection destination device in the connection device type column. No, and the column of the media lock state stores whether or not the optical disk can be taken out. The first port corresponds to IF-XCV43, and the second port is IF
-Corresponds to XCV44.

The removal of the optical disk is prohibited (indicated as locked), and the MPU 36 ignores the optical disk removal switch 46 even if it is pressed. If the optical disc is not prohibited from being ejected, the MPU 36 operates the optical disc ejection switch 46.
When is pressed, the optical disk attaching / detaching mechanism 34 is operated via the motor control unit 42, and the optical disk 31 is sent out of the optical disk device 30.

Next, the operation related to the disconnection of the interface will be described with reference to FIG. FIG. 5 shows an optical disk device 3
It is a figure which shows the transition of the operation state of 0. When the device is turned on, the optical disk device 30 enters the “low power consumption state” 151 at 161. In this state, only the MPU 36, the work memory 37, and the IF-XCVs 43 and 44 operate, and the other parts stop operating.

When the power is turned on, the MPU 36 initializes each unit, and also creates an interface state management table shown in FIG. 6 in the work memory. At this point, all ports are in the unconnected state.

When the initialization is completed, the MPU 36 confirms the interface connection state using the connection signal Connect from the IF-XCVs 43 and 44. In the configuration of FIG. 1, since the two ports are connected to another device, the MP
U36 determines that “there is a connection port” 162, and transitions the operation state to the “IF-ON state” 152. MPU36
Sets the connection status column of the first port and the second port of the interface status management table to the connecting state, and sets the IF-CTL 41 to the operating state.

When the optical disk 31 is inserted in the “low power consumption state” 151 (163), the operation state is changed to the “port standby state”, and the MPU 36 sets the optical disk attaching / detaching mechanism 34.
Is operated to attach the optical disk 31 to the spindle motor 32.

In the "IF-ON state" 152, the IF-XC
If the connection of either V43 or V44 is disconnected, the other connection is maintained (165), and the operation state remains unchanged in the “IF-ON state” 152, but the interface state management table The column of the connection status of the first or second port is rewritten to “no connection”.
When both the IF-XCVs 43 and 44 are disconnected, there is no connected port (164), so the state transits to the “low power consumption state” 151, the IF-CTL 41 is stopped, and the interface state is stopped. All ports in the management table are in the unconnected state.

When a command is received from the host device 20 in the “IF-ON state” 152 (166), the MPU 36
Changes the operation state to the “host connection state” 153. The MPU 36 changes the connection device type column of the port (referred to as a host port) on the side receiving the command in the interface status management table to “host device”.

When the optical disk 31 is inserted in the "IF-ON state" 152 (167), the operation state changes to the "media standby state" 155, and the MPU 36 operates the optical disk attaching / detaching mechanism 34 to move the optical disk 31 to the spindle motor 32. Attach to

In the “host connection state” 153, when all host ports are disconnected and there are no more host ports (16)
8), the operation state is transited to “IF-ON state” 152.

In the “host connection state” 153, when the host port is partially disconnected and there is another host port (16)
9) Although the operation state remains unchanged as “Host connection state” 153, the columns of the connection device type and the connection state of the disconnected port in the interface state management table are rewritten to “Other” and “No connection”, respectively. .

In the “host connection state” 153, when a new command is received from a port other than the host port (1
70), the operation state remains unchanged as the "host connection state" 153, but the connection device type column of the port on the side receiving the new command in the interface state management table is changed to "host device".

When the optical disk 31 is inserted in the "host connection state" 153 (167), the operation state changes to the "recording / reproduction state" 156, and the MPU 36 operates the optical disk attaching / detaching mechanism 34 to move the optical disk 31 to the spindle motor 32.
Attach to

In the "port standby state" 154, the spindle motor 32, the optical pickup 33, the RW-CH 38, the ODC 39, the buffer memory 40, and the IF-CNT 41 are in a stopped state.

When the interface is connected in the “port standby state” 154 (173), the MPU 36 changes the operation state to the “media standby state” 155. MP
U36 sets the connection status column of the connected port in the interface status management table to the connecting status, and sets the IF-CTL 41 to the operating status.

When the optical disk 31 is removed in the “port standby state” 154 (172), the MPU 36 changes the operation state to the “low power consumption state” 151.

When a part of the connected port is disconnected in the “media standby state” 155 (175), the operation state is “media standby state” because there is another connected port.
Although it remains unchanged at 155, the column of the connection status of the port that has detected the disconnection in the interface status management table is rewritten to “no connection”.

If all of the connected ports are disconnected in the "media standby state" 155 (174), the flow shifts to the "port standby state" 154, the IF-CTL 41 is stopped, and all of the interfaces in the interface state management table. The port is not connected.

When a command is received from the host device 20 in the “media standby state” 155 (177), the MPU 3
No. 6 changes the operation state to the “recording / reproducing state” 156. The MPU 36 changes the connection device type column of the port (referred to as a host port) on the side receiving the command in the interface status management table to “host device”.

When the optical disk 31 is removed in the “media standby state” 155 (176), the MPU 36 changes the operation state to the “IF-ON state” 152.

In the “recording / reproducing state” 156, the MPU 36
Are the spindle motor 32, the optical pickup 33 and the RW
-CH38, ODC39, buffer memory 40, and IF-
The CNT 41 is also set to the operating state.

In the "recording / reproducing state" 156, when all host ports are disconnected and there are no more host ports (17)
9), the operation state is transited to “media standby state” 155.

In the "recording / reproducing state" 156, when the host port is partially disconnected and there is another host port (18)
0), the operation state remains unchanged as “recording / reproducing state” 156, but the columns of the connected device type and the connection state of the disconnected port in the interface state management table are rewritten to “other” and “no connection”, respectively. .

In the "recording / reproducing state" 156, when a new command is received from a port other than the host port (18)
1) Although the operation state remains the same as the "recording / reproducing state" 156, the connection device type column of the port on the side receiving the new command in the interface state management table is changed to "host device".

In the “recording / reproducing state” 156, the optical disk 3
When 1 is extracted (178), the MPU 36 changes the operation state to the “host connection state” 153.

In the “recording / reproducing state” 156, the host device 2
When a lock command is received from 0 (182), the MPU
36 changes the operation state to the “locked state” 157.
The MPU 36 rewrites the media lock column of the port that has received the lock command in the interface state management table to “locked”.

In the “locked state” 157, the MPU 36 ignores the pressing of the optical disk ejection switch 46, and the optical disk 31 cannot be ejected from the optical disk device 30. Spindle motor 32, optical pickup 33, RW-CH 38, ODC 39, buffer memory 40 and I
The F-CNT 41 is operating.

In the "locked state" 157, when all host ports are disconnected and there are no more host ports (18)
6), the operation state is transited to “media standby state” 155.

In the “locked state” 157, the host device 20
When a lock release command is received from the client (183), MP
U36 transitions the operation state to the "recording / reproducing state" 156. The MPU 36 rewrites the media lock status column of the port that has received the lock release command in the interface status management table to “unlocked”.

When the lock command is received in the “lock state” 157, the MPU 36 returns an error to the command transmission source, does not change the operation state, and does not change the interface state management table.

When the host port receiving the lock command is disconnected in the “lock state” 157 and there is another host port (183), the MPU 36 changes the operation state to the “recording / reproducing state” 156. The MPU 36 rewrites the columns of the connected device type, the connection status, and the media lock status of the disconnected port in the interface status management table to “other”, “no connection”, and “no lock”, respectively.

In the "locked state" 157, when the host port other than the one receiving the lock command is disconnected and there is another host port (185), the operation state remains "locked state" 157. The MPU 36 rewrites the columns of the connection device type and the connection status of the disconnected port in the interface status management table to “other” and “no connection”, respectively.

When a new command is received from a port other than the host port in the “locked state” 157 (18)
4) Although the operating state remains unchanged as "locked state" 157, the connection device type column of the port on the side receiving the new command in the interface state management table is changed to "host device".

As described above, in this embodiment, when the interface is disconnected, the locked state is released, so that it is possible to prevent the optical disk from being locked in the optical disk device.

Next, a third embodiment of the present invention will be described. FIG. 7 is a diagram showing the configuration of the disk device according to the third embodiment. In this embodiment, the disk device 200 includes a magnetic disk unit 201, an IF-XCV 220, a relay 221, a DC power supply 222, a power switch 223, and an AC outlet 224. The DC current from the DC power supply 222 is sent to the magnetic disk unit 201 via the relay 2.
21 and directly to IF-XCV220. Commercial AC power is supplied to the DC power supply 222 via an AC outlet 224 and a power switch 223.

The components of the magnetic disk unit 201 have the same functions as those of the magnetic disk device 1 of the first embodiment. IF-XCVs 220 and 231 are the same as FIG. 2 of the first embodiment.

In this embodiment, the relay 221 is controlled by the connection signal Connect from the IF-XCV 220. When the interface is connected, the relay 221 is closed to supply a current from the DC power supply 222 to the magnetic disk unit 201. When the interface is disconnected, the relay 221 is opened to cut off the current from the DC power supply 222 to the magnetic disk unit 201.

In this embodiment, since there is one interface port, the presence or absence of the interface connection
By controlling the power supply to the magnetic disk unit, the power consumption of the disk device can be suppressed.

Next, a fourth embodiment of the present invention will be described. FIG.
FIG. 14 is a diagram showing the configuration of a magnetic disk device 301 and an interface connection unit 320 according to a fourth embodiment.

The magnetic disk device 301 includes a magnetic disk 302, a magnetic head 303, and a spindle motor 30.
4, head servomotor 305, RW-CH312
, MPU 310, work memory 311, HDC 3
13, a buffer memory 314, a fiber channel control unit (hereinafter referred to as FCAL-IF) 315, and a motor control unit 316. FCAL-IF3
Components other than 15 are the same as those of the magnetic disk drive 1 of the first embodiment. The FCAL-IF 315 controls the host interface of the fiber channel arbitrated loop specification, and transmits and receives a command for instructing a recording / reproducing operation and recording / reproducing data to and from the host device.

The interface connection section 320 comprises a receiver 321 and drivers 322 and 323.
Magnetic disk device 301 and interface connection unit 32
Between 0, a driver selection signal (hereinafter referred to as a DRVsel signal) for setting the operation of the interface connection unit,
The connection is made by a data signal (hereinafter, referred to as Din) input to the magnetic disk device 301 and a data signal (hereinafter, referred to as Dout) output from the magnetic disk device 301. The drivers 322 and 323 operate exclusively, and one of the drivers enters an output state depending on the state of the DRVsel signal as shown in FIG. DRVse
If the 1 signal is high or open, the driver 3
22 is in an output state, and the driver 323 is in a high impedance state in which output is stopped. When the DRVsel signal is in a low state, the driver 322 enters a high impedance state in which output is stopped, and the driver 323 enters an output state. That is, when the DRVsel signal is in the high state or the open state, the FCAL-in signal is output as the FCAL-out signal without passing through the magnetic disk device 301 and without passing through.

FIG. 9 shows an example of the configuration of a computer system using a magnetic disk drive to which the present invention is applied. FCAL-out signal of each interface connection and FCAL-out signal
The in signal is sequentially connected, and each device including the host device 326 is connected in a ring. An operating current is individually supplied from the DC power supply 327 to the magnetic disk devices connected to each interface.

Next, an operation related to disconnection of the interface will be described with reference to FIG. In this embodiment, the interface is mechanically connected, but a case where a command cannot be logically exchanged is also referred to as disconnection of the interface. FIG. 11 is a diagram showing transition of the operation state of the magnetic disk device 301. When the device is turned on (340),
First, the magnetic disk device 301 is in the “low power consumption state” 33.
Becomes 1. In this state, only the MPU 310 and the work memory 311FCAL-IF 315 operate, and the other parts stop operating. The DRVsel signal is in a high state, and the interface connection unit 320 is in a transparent state.

When an IF block release command is received from the host device 326 in the “low power consumption state” 331 (34)
1), the MPU 310 changes the operation state of the device to the “IF-ON state” 332, and sets the DRVsel signal to the low state.

When an IF block command is received from the host device 326 in the “IF-ON state” 332 (342),
The MPU 310 sets the operation state of the device to “low power consumption state” 3
Then, the DRVsel signal is set to the high state.

When a motor START command is received from the host device 326 in the “IF-ON state” 332 (3)
43), the MPU 310 changes the operation state of the apparatus to the “recording / reproduction state” 333, sets the DRVsel signal to the low state, and sets the spindle motor 304 and the head servo motor 30
5, the RW-CH 312, the HDC 313, the buffer memory 314, and the motor control unit 316 are brought into the operating state.

In the “recording / reproducing state” 333, the host device 3
When the motor STOP command is received from 26 (34)
4), the MPU 310 changes the operation state of the apparatus to the “IF-ON state” 332, sets the DRVsel signal to a low state, and sets the spindle motor 304 and the head servo motor 30
5, the RW-CH 312, the HDC 313, the buffer memory 314, and the motor control unit 316 are stopped.

In the “recording / reproducing state” 333, the host device 3
26 (344), the M
The PU 310 sets the operation state of the device to the “low power consumption state” 33
1 to make the DRVsel signal high, the spindle motor 304, the head servomotor 305 and the RW-
The CH 312, the HDC 313, the buffer memory 314, and the motor control unit 316 are stopped.

As described above, in the present embodiment, when the interface is closed, the disk device itself stops the motor and the recording / reproducing circuit sequentially. It is possible to suppress the power consumption without destroying the data being stored.

[0094]

According to the present invention, even if the connection of the interface is disconnected, it is possible to reduce the power consumption while protecting the information held in the disk device, and to prevent the recording medium from being trapped in the device. Can be.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a computer system and a disk device.

FIG. 2 is a configuration diagram of an interface transceiver.

FIG. 3 is a diagram showing an interface state management table.

FIG. 4 is a diagram showing a transition of an operation state of the magnetic disk device.

FIG. 5 is a diagram showing a transition of an operation state of the optical disc device of the second embodiment.

FIG. 6 is a diagram illustrating an interface state management table according to the second embodiment;

FIG. 7 is a configuration diagram of a magnetic disk drive of a third embodiment.

FIG. 8 is a configuration diagram of a magnetic disk drive of a fourth embodiment.

FIG. 9 is a configuration diagram of a computer system according to a fourth embodiment.

FIG. 10 is a diagram illustrating output switching of an interface driver according to a fourth embodiment.

FIG. 11 is a diagram showing a transition of an operation state of the magnetic disk device of the fourth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic disk device, 2 ... Magnetic disk, 3 ... Magnetic head, 4 ... Spindle motor, 5 ... Head servomotor, 10 ... Microprocessor, 11 ... Work memory,
12 read / write channel, 13 hard disk controller, 14 buffer memory, 15 host interface controller, 16 motor controller, 17-18 interface transceiver, 19 DC power supply, 20 host device, 21 interface Transceiver, 30
... optical disk device, 31 optical disk, 32 spindle motor, 33 optical pickup, 34 optical disk attaching / detaching mechanism, 36 microprocessor, 37 work memory, 38 read / write channel, 39 optical disk controller, 40 buffer memory 41 Host interface control unit 42 Motor control unit 43-44 Interface transceiver 45 DC power supply 46 Optical disk ejection switch 50 Magnetic disk device 6
0: A port, 61: differential bus driver, 62: differential bus receiver, 63 to 64: resistor, 65: bias power supply,
66-67: terminal, 70: B port, 71: differential bus driver, 72: differential bus receiver, 73-77: resistor,
78: voltage comparator, 79: voltage source, 81 to 82: terminal,
200: magnetic disk device, 201: magnetic disk unit, 202: magnetic disk, 203: magnetic head, 2
04: Spindle motor, 205: Head servo motor, 210: Microprocessor, 211: Work memory, 212: Read / write channel, 213: Hard disk controller, 214: Buffer memory, 215: Host interface controller, 216: Motor controller , 2
20 Interface transceiver, 221 Relay, 222 DC power supply, 223 Power switch, 224
... AC outlet, 230 host device, 231 interface transceiver, 301 magnetic disk device, 302 magnetic disk, 303 magnetic head, 30
4 ... Spindle motor, 305 ... Head servo motor,
310 ... microprocessor, 311 ... work memory,
312: read / write channel, 313: hard disk control unit, 314: buffer memory, 315: fiber channel control unit, 316: motor control unit, 320: interface connection unit, 321: receiver, 322-3
23: Driver, 326: Host device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoki Oura 5-20-1, Josuihoncho, Kodaira-shi, Tokyo In the semiconductor division of Hitachi, Ltd.

Claims (6)

[Claims] 1. A disk device having a storage medium and an interface for connection with another device, a detecting means for detecting a connection state of the interface, Updating means for updating information on the presence or absence of connection with the registered other device in the interface state management table in which information on the presence or absence of connection with the other device is registered, based on the result of the detecting means; A change unit that changes the operation state of the disk device when the information on the presence or absence of connection with another device registered in the interface state management table is updated by the update unit. 2. The disk drive according to claim 1, wherein said detecting means comprises: a reference voltage source for outputting a voltage; and said other device when a voltage lower than a voltage output from said reference voltage source is detected. And a voltage comparator for outputting a signal without connection. 3. The disk device according to claim 1, wherein the changing unit includes: a unit that stops supply of a driving current for driving the disk device. Disk device to be used. 4. The disk device according to claim 1, wherein the disconnection of the interface with the other device is performed when a signal is logically blocked. A disk device, comprising: 5. A disk device using a removable storage medium, an interface for connection to another device, detection means for detecting a connection state of the interface, and the other device by the detection means. Means for releasing the removal prohibition state of the removable storage medium when disconnection of the interface is detected. 6. The disk device according to claim 5, wherein disconnection of the interface with the other device is a logical blockage of a signal.