JPS63217578A - Fixed magnetic storage device - Google Patents

Abstract

PURPOSE:To attain high speed access and to improve processing efficiency by giving a track recording sampling clocks and providing read/write heads reading the sampling clocks from the track. CONSTITUTION:A read/write head selection part 4 switches which data recorded and reproduced in the read/write heads 7 and 8 to connect to a host unit, and a read/write head selection signal 1 from the host unit selects it. On the other hand, read/write heads for sampling clock reproduction 15 and 16 read the sampling clocks 17 and 18 from the private track 22, transmit them to a sampling clock switching part 19, and either of the clocks is outputted to the host unit. With such a constitution, a sampling clock generation circuit is eliminated, and accurate sampling clocks can be outputted, whereby speedy and accurate data access can be executed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to fixed magnetic storage devices.

[Conventional technology]

Fixed magnetic storage devices can provide high-speed and large-capacity data to host devices, and have rapidly become popular as prices have declined in recent years.

The operation of the fixed magnetic storage device will be explained with reference to FIGS. 4 and 5.

FIG. 4 is a block diagram showing the structure of a conventional fixed magnetic storage device, and FIG. 5 is a top view.

A magnetic disk 11 having a magnetic storage medium on its surface is rotated by a motor 6, and a lead 2 is attached to the magnetic disk 11.
Recording and reproducing operations are performed with the head 7.8 brought into almost contact with tl.

The read/write head 7.8 is moved linearly in the radial direction of the magnetic disk 11 by the read/write head drive mechanism 5. Since the magnetic disk 11 is rotating, the read/write head 7.8 traces the surface of the magnetic disk 11 along a trajectory as shown at 20.21 in FIG. Lead
Each of these trajectories 20.21 according to the position of the two-item head
is called a truck. The read/write head drive mechanism 5 moves the read/write head 7.8 to the track designated by the track position instruction signal 3 from the host device. The magnetic disk 11 has magnetic storage media on its upper and lower surfaces, and has two read/write heads for one magnetic disk. Therefore, the read/write head selection unit 4 switches which of the data recorded and reproduced by the read/write head 7 and the data recorded and reproduced by the read/write head 8 is connected to the host device. There is.

The read/write head selection unit 4 determines which read/write head to select based on the read/write head selection signal 1 sent from the host device.

The nine read data 2 selected by the read/write selection section 4 are sent to the host device and the sampling clock generation circuit 12.
is input. The sampling clock generation circuit 12 generates a sampling clock 14 from the input read data 2.
is generated and input to the host device.

FIG. 6 shows an example of the waveforms of the read data 2 and the sampling clock 14 input to the host device. In FIG. 6, the host device samples a read data waveform 231Fr using the input sampling clock waveform 24, and recognizes a data string @0100100010-25.

The above is the basic operation of a fixed magnetic storage device.

In FIG. 4, a sampling clock generation circuit 12 that generates a sampling clock 14 is composed of electronic components such as LSI. The signal is input to the sampling clock generation circuit 12. Read data read from the floppy disk 11 through the read sound write head 7°8.
Data 9.10 has a considerable bit deviation before and after the reference position at the time of writing due to peak shifts peculiar to magnetic storage, rotational fluctuations of the motor 6, and the like.

The sampling clock generation circuit 12 uses the read data 9.10, which has a considerable bit fluctuation before and after this, as follows.
LSI to generate accurate sampling clock 14
It has a complex circuit configuration with electronic components such as.

If an accurate sampling clock cannot be generated, the host device will read the read data incorrectly, and if the data cannot be read or read, the host device will try again.
It is necessary to perform a data reading operation. Currently, a dedicated L is used to configure this sampling clock generation circuit 12.
Although there are SI and the like, complicated adjustments are required to generate an accurate sampling clock 14. Furthermore, as the performance of fixed magnetic storage devices improves, the configuration of the sampling clock generation circuit 12 is also becoming more complex and difficult.

[Problem that the invention seeks to solve]

As described above, in conventional fixed magnetic storage devices, the performance of the fixed magnetic storage device is affected by the sampling clock generation circuit, and the processing efficiency of the host device is reduced.
There is a problem in that high-speed access to data is hindered.

An object of the present invention is to provide a fixed magnetic storage device that allows high-speed access and improves the processing efficiency of host devices.

[Means for solving problems]

The fixed magnetic storage device of the present invention has a track for recording a sampling clock, and is equipped with a read/write head for reading the sampling clock from the track.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention, and FIG. 2 is a top view.

A magnetic disk 11 having a magnetic storage medium on its surface is rotated by a motor 6, and all recording and reproducing operations are performed with the magnetic disk 11 almost in contact with a read/write head 7.81.

The read/write head 7.8 is moved linearly in the radial direction of the magnetic disk 11 by the read/write head drive mechanism 5. Since the magnetic disk 11 is rotating, the read/write head 7.8 traces the surface of the magnetic disk 11 along a trajectory as shown at 20.21 in FIG. This locus is called a track. The read/write head drive mechanism 5 moves the read/write head 7.8 to the track designated by the track position instruction signal 3 from the host device. The magnetic disk 11 has magnetic storage media on the upper and lower surfaces, and 1 t of read/write heads per magnetic disk.
I have two. Therefore, the read/write head 7 records,
The data to be reproduced and recorded by the read/write head 8,
A read/write head selection unit 4 switches which of the reproduced data is to be connected to the host device.

The read/write head selection unit 4 is sent from the host device. The read/write head selection signal 1 determines which read/write head is to be selected.

On the other hand, the read/write heads 15 and 16 for reproducing the sampling clock read the sampling blocks 17 and 181 from the track 22 where the sampling clock is recorded in FIG.

The sampling clock switching unit 19 determines whether to output the sampling clock 17 read by the sampling clock reproducing read/write head 15 to the higher-level device, or output the sampling clock 18 read by the sampling clock reproducing read-write head 16 to the higher-level device. is switching.

In this embodiment, one read/write head for sampling clock reproduction is provided on each of the front and back surfaces of the magnetic disk. Therefore, the sampling clock can be reproduced in a state close to the track where data is recorded on each magnetic disk surface.

[Example 2] FIG. 3 is a block diagram of two embodiments of the present invention.

A magnetic disk 11 having a magnetic storage medium on its surface is rotated by a motor 6, and a read/write head 7.8 is brought into almost contact with the magnetic disk 11 to perform recording and recording.
Perform playback operation.

The read/write head 7.8 is moved linearly in the radial direction of the magnetic disk 11 by the read/write head drive mechanism 5. Since the magnetic disk 11 is rotating, the read/write head 7.8t/i is the same as in Example 1.
The surface of the magnetic disk 11 is traced along a trajectory as shown in 20.21 of the figure. This locus is called a track.

The read/write head drive mechanism 5 moves the read/write head 7.8 to the track specified by the track position instruction signal 3 from the host device.

The magnetic disk 11 has magnetic storage media on its upper and lower surfaces, and has two read/write heads for one magnetic disk.

Therefore, the read-write head selection unit 4 switches which of the data recorded and reproduced by the read-write head and the data recorded and reproduced by the read-write head 8 should be connected to the host device.

The read/write head selection unit 4 determines which read/write head to select based on the read/write head selection signal 1 sent from the host device.

On the other hand, as in the first embodiment, the sampling clock reproducing read/write head 13 reads the sampling clock 14 from the track 22 on which the sampling clock is recorded in FIG. 2 and outputs it to the host device.

〔Effect of the invention〕

As explained above, the present invention eliminates the membership fee for the sampling clock generation circuit composed of electronic components such as LSI by biasing the sampling clock reading from the magnetic disk, and outputs an accurate sampling clock. This has the effect of satisfying various conditions required for an external storage device, such as high-speed and accurate access to data.

[Brief explanation of the drawing]

1 is a block diagram of the first embodiment of the present invention, FIG. 2 is a top view thereof, FIG. 3 is a block diagram of the second embodiment of the present invention, and FIG.
The figure is a block diagram showing an example of a conventional fixed magnetic storage device.
FIG. 5 is a top view thereof, and FIG. 6 is a waveform of the signal in FIG. 4. 1... Read-write head selection signal, 2...
... Read data, 3 ... Track position instruction signal, 4 ... Read/write head selection section,
5...read/write head drive mechanism, 6...
...Motor, 7.8... Read/write head, 9.10... Read/write data from read/write head, 11... Magnetic disk, 12・・・・・・Sampling clock generation circuit, 1
3... Read/write head for sampling clock reproduction, 14... Sampling clock,
15.16... Read/write head for sampling clock reproduction, 17.18... Sampling clock, 19... Sampling clock switching section, 20, 21.22... truck, 23...
... Read data waveform, 24 ... River sampling clock waveform, 25 ... Data string. 14 Pung-a-song-guk-a-tsu 2 Figure 3

Claims (1)

[Claims] A fixed magnetic storage device comprising a read/write head for reproducing a sampling clock that reads a sampling clock for read data from a magnetic disk.