JPH04102267A - Hard disk device - Google Patents

Abstract

PURPOSE:To shorten access time by forming spiral recording tracks on the surface and back planes of a magnetic hard disk, and performing recording and reproduction by tracking them with a magnetic head. CONSTITUTION:The magnetic hard disk 10 on the surface and back planes of which the recording tracks are formed spirally is used. In the recording of data, after the data is recorded successively along the recording track formed on the plane on one side, the magnetic head is switched to the magnetic head 14 for the plane on the other side. Therefore, no specific access operation is required in continuous recording even when no complete coincidence between the center points of the recording tracks on the surface and the back plane of the disk 10 is obtained. The access control of the magnetic head 14 is performed only when recording data is switched from the surface to the back plane.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hard magnetic disk device that can store and read a large amount of data on a magnetic disk.

[Summary of the Invention] A hard magnetic disk device of the present invention comprises a driving means for rotating one or more hard magnetic disks on which spiral recording tracks are formed in advance on the front and back surfaces, and the hard magnetic disk. A magnetic head means for recording or reproducing data by moving in the radial direction in contact with the front and back surfaces of the magnetic head, and a tracking means for controlling the magnetic head means to scan a desired recording track. Since the recording data is provided with a control means such that it is continuously recorded in a spiral track on either side of the hard magnetic disk, the access time is faster than that of a conventional hard magnetic disk. I can do it.

[Prior Art] I rotates a disk back in which two or more hard magnetic disks are stacked, and records or reads data using a plurality of pairs of magnetic heads that are in contact with the front or back surface of each of these hard magnetic disks. Hard magnetic disk drives designed to perform this function are used as external storage devices for computers that back up large amounts of data.

FIG. 4(a) shows the recording tracks of one hard magnetic disk employed in such a hard magnetic disk device, and there are concentric recording tracks T on the front and back surfaces of the hard magnetic disk 10. + r + T'□
, T13... are formed.

Further, the recording areas of these tracks are divided in the circumferential direction, and address management of recording data is performed by sector marks added to each divided sector S.

When recording data on such a hard magnetic disk, for example, as shown in the enlarged cross-sectional view taken along the line A-A in FIG. Tracks T are located on the same radius of the back surface [O surface]. Data is recorded in 1. Below [page 1] and [0
Track T I21 T on the same cylinder of
While 021 T 13 + T 03 . . . are selected alternately, the magnetic head is moved in steps from the outer circumference (inner circumference) to the inner circumference (outer circumference) side, and data is recorded.

[Problem to be Solved by the Invention 1] However, in such a hard magnetic disk, if the width of the recording track is further narrowed (and the recording density is increased), the S/N will deteriorate due to cross-over from adjacent tracks. It turns out.

Therefore, as shown in the cross-sectional view of a hard magnetic disk in Fig. 5, a guard band G where no data is recorded is provided between the recording tracks T, ..., T, and □ on one side to reduce crosstalk. A high pitch (5 μm) separate magnetic recording track disk (discrete mesoyer) has been developed.

However, in a hard magnetic disk having such a highly accurate track pitch, the recording track T l on the surface
The recording track T on the back side with respect to l, T I□, T13... It becomes extremely difficult to form the positions of l+ Ta21 Ta3... so that they are completely located on the same radius.

Furthermore, when two or more hard magnetic disks with such high pitch tracks are fixed to a rotating shaft as a disk back, a small (at least several micrometers) eccentricity will occur between them.

Therefore, as mentioned above, when recording data on a hard magnetic disk, concentric recording tracks T on [first side] are used.
Ill T, 2. Tea... and concentric recording tracks T on [O side]. l, Ta2. If the recording operation proceeds while alternately selecting Ta3... (cylinder management), tracking control is required to access the track on the 1st side and 0th side each time the recording track is moved, and the access A problem arises in that it takes a long time.

Means for Solving Problem E] The present invention has been made for the purpose of reducing such problems, and first, the recording tracks of a hard magnetic disk formed in a separate type are formed in a spiral shape on both the front and back sides. When recording a continuous series of data, the data is controlled to be recorded sequentially, for example, from the inner circumferential side to the outer circumferential side of the spiral recording track formed on one surface. Then, after data is recorded on the recording tracks on one side, the recording tracks on the other side are selected, and the data is controlled to be recorded, for example, from the outer circumference to the inner circumference of this side.

[Operation] Separate spiral recording tracks with guard bands are formed in advance on the front and back surfaces of the hard magnetic disk, so when recording data, data is recorded from one side along these spiral tracks. can be performed continuously.

Since a series of recorded data is continuously formed on each recording surface of a hard magnetic disk, track access control is only required when data is transferred to a different surface, and the conventional track access control is required only when data is transferred to a different surface. No need to access.

[Example] FIG. 1 shows a track format formed on the surface of a hard magnetic disk of the present invention, such as a recording track T on which a magnetic material is deposited.

is said to be a spiral track. Also, there is a recording track T spirally running in the same direction as shown by the dotted line on the back side.

is formed.

As mentioned above, these recording tracks are separated by guard bands made of non-magnetic material, and are configured to reduce crosstalk from adjacent tracks, and are divided into appropriate sectors for address management. I'm trying to make it happen.

One or more of such hard magnetic disks 10 are fixed to a rotating shaft 11 as shown in FIG. Driven.

In FIG. 2, J2 indicates a carriage configured to be moved in the radial direction of the disk by a linear motor 13, and a pair of magnetic heads 14A are brought into contact with the front and back surfaces of the hard magnetic disk 10 by this carriage 12. and 14B move between the inner and outer peripheries of the hard magnetic disk 10. Then, tracking control is performed so that the recording medium is located on a desired recording track.

The pair of magnetic heads 14A and 14B is a flying head, as is well known, and the number of magnetic heads 14A and 14B that correspond to the number of hard magnetic disks stacked on the carriage 1 is
It is placed in 2. For example, an error signal is detected by detecting tracking information formed on the magnetic track, and tracking servo is applied using this error signal.

FIG. 3 shows a pair of magnetic heads 14A and 14B that record/reproduce data on the front and back sides of the hard magnetic disk 10.
and heads 15A and 15B that detect tracking information.
This is a simple block diagram of a hard magnetic disk drive equipped with a hard magnetic disk, where SRW is a switch that changes the data recording/reproduction mode, and ScH is a switch that switches the magnetic head that contacts the front and back sides of the hard magnetic disk. shows. Reference numeral 16 indicates a signal processing circuit for recording data, and reference numeral 17 indicates a signal processing circuit for read data, which are controlled by a control unit 18 of the hard magnetic disk device.

Tracking information on the front and back surfaces of the hard magnetic disk 10 obtained from the magnetic heads 15A and 15B is supplied to an error detection section 19, and a tracking error is generated. This tracking error is then supplied to a tracking means 20 consisting of a tracking servo circuit, a track jump circuit, etc., which controls the pair of magnetic heads to access a desired recording track on the front or back surface.

As described above, the hard magnetic disk device of the present invention uses a hard magnetic disk 10 in which spiral recording tracks are formed on the front and back surfaces. When data is recorded on this hard magnetic disk 10, data is continuously recorded along a spiral recording track formed on one side of the hard magnetic disk 10, and data is recorded on this one side. After that, the recording head is switched so that the recording head is supplied to the magnetic head that is in contact with the other side.

At the time of this switching, tracking control corresponding to the eccentric component of the disk is performed.

Furthermore, when the hard magnetic disk device 10 is composed of a stack of two or more disks, when the data recording on the first hard magnetic disk 10 is completed, the second hard magnetic disk 10 is selected, and data is written in the same sequence as the first hard magnetic disk 10.

Therefore, even when the centers of the recording tracks T formed on the front and back surfaces of the hard magnetic disk 10 do not completely coincide, no special access operation is required when data is being recorded continuously. Yes, the speed (recording or playback operation) will be higher. Then, access control of the magnetic head is performed only when the recorded data is switched from the front side (or back side) to the back side (front side).

That is, the data recording/reproducing speed is increased because the operation of accessing each track as in the conventional cylinder management method employed when writing data on concentric recording tracks is no longer necessary. In particular, when performing data stream-like operations such as writing and reading a series of data, access time can be significantly reduced.

Although the above embodiment has been described with respect to one hard magnetic disk, similar control can be performed even when two or more hard magnetic disks are used by increasing the number of magnetic heads and switch circuits.

〔Effect of the invention〕

As explained above, the hard magnetic disk device of the present invention includes a hard magnetic disk having spiral recording tracks formed on the front and back surfaces, and tracks the spiral recording tracks with a magnetic head. , a series of data is recorded or played back, so even if the recording track positions on the front and back sides are shifted from each other, track access is only performed when moving from one disc surface to the other. This can shorten access time.

Furthermore, since the precision of track misalignment between the front and back surfaces of the hard magnetic disk is relaxed, the specifications of the hard magnetic disk can be relaxed, and there is an advantage that costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a hard magnetic disk used in the hard magnetic disk device of the present invention, FIG. 2 is a schematic diagram of the hard magnetic disk device, FIG. 3 is a block diagram of the pigeon magnetic disk device, and FIG. 4 is a plan view of a hard magnetic disk used in the hard magnetic disk device of the present invention. A plan view of a conventional hard magnetic disk, and FIG. 5 shows a cross-sectional view of a separate track type magnetic track. In the figure, 10 is a hard magnetic disk, 12 is a carriage,
13 is a linear motor, and 14A and 14B are magnetic heads. T+ (Surface recording track) Figure 1

Claims (1)

[Claims] A driving means for rotating one or more hard magnetic disks on which recording tracks on the front and back surfaces are formed in a spiral shape in advance; one or more pairs of magnetic head means for recording or reproducing data; and tracking means for accessing the magnetic head to a desired recording track of the hard magnetic disk, the data recorded on the hard magnetic disk is A hard magnetic disk device characterized in that it is controlled to be continuous with recording tracks formed in a spiral shape.