JPH04137257A - Data recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent an adverse effect on a readout system from a motor drive by holding the supply of a current to the motor during the readout of data and avoiding the overlap of the readout operation of data with the driving operation of the motor. CONSTITUTION:When a recording medium 15 revolves to a prescribed direction by means of the driving of the motor 17 and reaches a normal revolution, a CPU 12 begins read/write access through a read/write circuit 13. At this point, the CPU 12 controls motor drive circuit 16 to temporarily turn off the motor 17 during the read and turn it on again when the read operation ends. When the motor 17 is turned off, the recording medium 15 revolves by the moment of inertia. Thus, the read operation of the data and the drive operation of the motor 17 do not overlap each other in point of time wise, the adverse effect on the readout system from the dving of the motor is prevented, and the margin in the readout system is improved.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a data recording/reproducing device such as a magnetic disk device or an optical disk device, and particularly relates to a data recording/reproducing device having a readout system and a motor drive system. Regarding equipment.

(Prior Art) Conventionally, for example, in a magnetic disk device, data is written/written to a disk, which is a recording medium, through a head. Here, the disk is rotated by driving a spindle motor, for example, a DC motor. By driving this motor, when the disk reaches steady rotation, data read/write access becomes possible.

By the way, in magnetic disk drives, switching noise caused by motor drive adversely affects the read signal, which is a particularly small signal, through the power supply system and wiring system, causing the S of the read signal to decrease.
There is a problem of deteriorating the /N ratio and reducing the margin of the read system. Conventionally, as shown in FIG. 4, motor control is performed both when writing and reading data, and a drive current is constantly supplied to the motor. I wanted to,
At the time of reading, the above-mentioned situation occurred.

Although the above-mentioned problems can be solved by separating the reading system and the motor drive system, this is difficult in ultra-small magnetic disk drives due to the mounting area limitations.

(Problems to be Solved by the Invention) As described above, conventionally, there has been a problem that switching noise due to motor drive has an adverse effect on the readout system, reducing the margin of the readout system.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a data recording/reproducing device that can prevent the adverse effects of motor drive on the readout system and improve the margin of the readout system.

[Structure of the Invention (Means and Effects for Solving the Problems)] The present invention provides a data recording/reproducing device equipped with a motor for rotating a recording medium, during a data reading period (read time). This is to stop the current supply.

According to such a configuration, it is possible to avoid the data read operation and the motor drive operation from overlapping in time, thereby preventing the motor drive from having an adverse effect on the read system.

(Embodiment) A data recording and reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of, for example, a magnetic disk drive (HDD). In FIG. 1, an interface 11 is used to exchange data with a host computer (not shown), and here it transfers read/write commands to the CPU 2 and read/write data to a read/write circuit 13. . The CPU 12 is in charge of controlling the entire device, and here executes the motor control process shown in FIG. 2.

The read/write circuit 13, under the control of the CPU 12,
Data is written/written to the recording medium 15 through the head 14. The motor drive circuit 16 supplies a drive current to the motor 17 under the control of the CPU 12.

The motor 17 is a spindle motor for rotating the recording medium 15, and is composed of, for example, a DC motor.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in FIG.

When the device power is turned on, the CPU 12 first starts the motor 17 through the motor drive circuit 16 (step S
l). By starting the motor 17, the recording medium 15 rotates in a predetermined direction. When the recording medium 15 reaches steady rotation (step S12), the CPU 12 starts read/write access through the read/write circuit 13 (
Step S3).

Here, as shown in FIG. 3, when reading, CP
U12 temporarily turns off the motor 17 and controls the motor drive circuit 16 to turn on the motor 17 again when the read operation is completed (steps 84 to S8).

Note that turning off the motor 17 means stopping the supply of drive current to the motor 17, and during this time, the recording medium 15 is rotating by inertia. Also, the end of the lead is
It can be determined by command. That is, at the time of reading, the CPU 12 receives a command from the interface 11 indicating how far to read, and turns on the motor when the final portion of data is read.

On the other hand, in the case of writing, the CPU 12 does not turn off the motor 17 and executes the writing operation as usual (steps S9 and 5).
IO).

In this manner, since the motor 17 is in the off state when reading data, switching noise caused by driving the motor 17 can be prevented from adversely affecting the reading system. In this case, in an ultra-small magnetic disk device, data reading is completed within one rotation of the recording medium 15 at most. Therefore, even if the motor 17 is turned off during this time, the rotation of the recording medium 15 will not fall below the allowable value, and data can be read normally.

Although the above embodiment describes a magnetic disk device, the present invention is not limited to this. For example, any data recording/reproducing device having a reading system and a motor drive system, such as an optical disk device, can be used in the same manner as described above. Similar effects can be obtained using this method.

[Effects of the Invention] As described above, according to the present invention, since the data read operation and the motor drive operation do not overlap in time,
It is possible to prevent an adverse effect on the readout system due to motor drive, and improve the margin of the readout system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of the embodiment, and FIG. 3 is a timing chart for explaining the operation of the embodiment. , FIG. 4 is a timing chart for explaining the conventional operation. 11...Interface, 12...CPU, 13
... Read/write circuit, 14... Head, 15.
...Recording medium, 16...Motor drive circuit, 17...
motor. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A motor for rotating a recording medium, a current supply means for supplying a drive current to the motor, a data reading means for reading data from the recording medium, and a data reading period by the data reading means. A data recording/reproducing device comprising: a control means for stopping the current supply by the current supply means.