JPH0589637A - Magnetic storage medium - Google Patents

Abstract

PURPOSE:To enable the on-line determination of the precision of all track positions which are seeked by a magnetic head by using a medium wherein an information track which uses a position at a prescribed distance from the regular rotation center as the center has been formed. CONSTITUTION:A medium wherein a position B dislocated by the distance L of the width of a guard band with reference to the rotation center A of a regular information block track N+1 is used as the center and eccentric information block tracks N', N'+1, N'+2 which are wider than the width of the guard band have been formed is installed. The medium is mounted on a magnetic storage device to be inspected; the eccentric information block tracks are read out by using a magnetic head in which a track dislocation has been caused; a data interference is caused; address information and data information cause CRC errors or the data information becomes erroneous information. Since a dislocation direction and a dislocation amount can be estimated by the position of an address at this time, it is possible to easily inspect the error of a head attachment position and the accuracy of a head feed operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used in a magnetic storage device. In particular, the present invention relates to an inspection medium of a magnetic storage device for inspecting a mounting position error of a magnetic head and a magnetic head feeding accuracy of a medium exchange type magnetic storage device for recording digital information in a floppy disk device or the like.

[0002]

2. Description of the Related Art A medium exchange type magnetic storage device such as a floppy disk device stores a digitized information on a floppy disk recording medium by electromagnetically converting a high frequency electric signal through a magnetic head. The information stored on the medium is electromagnetically converted via the magnetic head, and is extracted as a pulse signal to read the information. Since such a storage device is used by exchanging a medium for recording information, the same medium is not always written and read by the same device, and the same medium may be written and read by different devices. .. Therefore, the magnetic head for writing and reading in the storage device has an error in mounting (head position alignment adjustment error) and head feed accuracy (positioning mechanism) with respect to the correct radial position defined for the recording area on the medium. Then, a read signal may not be obtained and a read error may occur. For this reason, a magnetic head position adjusting CE disk (alignment adjusting medium) in which the amplitude of the read signal is recorded as analog information so that the mounting position of the magnetic head becomes a normal position for a specific track during manufacture is used. In general, the precision of various head feed mechanism parts is improved so that each track can be positioned at a proper position when the head feed mechanism is assembled.

[0003]

However, for example, when the magnetic head is incorporated in another device as a part of a computer system and shipped, the magnetic head is not properly operated due to vibrations received during transportation and improper mounting of the device. The position of the magnetic head may deviate, and it is necessary to confirm the alignment of the magnetic head at the installation location of the magnetic storage device after transportation. For this reason, in the conventional magnetic storage device, the magnetic storage device is separated from the system and inspected by using an oscilloscope, a special storage device driving equipment (exerciser), and a CE disk. A skilled person having a high level of skill in operating the equipment and separating the magnetic storage device from the system is required, and it is difficult to judge the quality of the magnetic storage device in a short time. ..

An object of the present invention is to eliminate such drawbacks, and an object thereof is to provide a magnetic storage medium capable of easily inspecting the mounting position error of the magnetic head and the feeding accuracy of the magnetic head.

[0005]

According to the present invention, an information block track having a plurality of information blocks including an address block and a data block on the same circumference and a guard band provided between adjacent information block tracks are provided. In a magnetic storage medium having the same, the data is written concentrically around the position of 1/3 of the width of the guard band or a distance equal to this width with respect to the rotation center position of the medium as concentric circles. It is characterized by having a plurality of information block tracks having a wide width.

[0006]

The magnetic storage medium of the present invention is mounted on a magnetic storage device in which the mounting position error of the magnetic head and the feeding accuracy of the magnetic head are inspected. When an eccentric information block track is read by a magnetic head with track deviation, data interference occurs and CR of address information and data information is generated.
C error or data information becomes false information. The shift direction and shift amount can be estimated from the address position at this time.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a magnetization state region diagram of an embodiment of the present invention. A position B deviated by a guard band width distance L from the rotation center A of the regular information block track N + 1.
Eccentric information block tracks N ', N'
+1 and N '+ 2 are written. If this medium is mounted on a spindle that is eccentric by L and information is written, eccentric information block tracks can be written, and this means is adopted as a general method in analog CE disks and the like. FIG. 2 shows the first embodiment, and is a state diagram in the case of measuring the positioning accuracy of the magnetic head using the inspection medium when the eccentricity L is set to the guard band width G. The interference of information from the adjacent track N + 1, which occurs when the magnetic head 10 reads the normally written information block track N + 2 at the regular track position, is prevented by the guard band G erased by AC or DC.
When the eccentric track N '+ 2 is read by the magnetic head whose normal head position is positioned, the amount of information read at 90 ° and 270 ° is small, but the information on the adjacent track N' + 1 is hardly read. No error occurs. However, when reading the information block track which is eccentric with the magnetic head 11 having the track deviation toward the track N + 1 side, the track N ′ + is found in the area CC ′.
Data of 2 and the track N ′ + 1 are read together to cause data interference, resulting in CRC error of each address information and CRC error of data information shown in FIG. Further, in the magnetic head 12 in which the track deviation occurs on the track N + 2 side, the information of the track N '+ 2 and the track N' + 1 are both read in the area DD ', and an error occurs. At this time, the off-track direction (deviation direction) and the off-track amount (deviation amount) can be easily estimated by the address position (address block information) at which an error occurs, but in this embodiment, even a slight amount of track deviation occurs. If this occurs, an error will occur in all tracks, and if there are errors due to other causes, the amount of track deviation cannot be accurately measured. For this purpose, a plurality of tracks must be read and compared to calculate the track deviation amount.

FIG. 3 shows the second embodiment, in which the positioning accuracy of the magnetic head is measured using an inspection medium when the eccentricity L is Δ which is about 1/2 of the guard band width G. FIG. Since the eccentric amount L is smaller than the guard band width G as compared with the first embodiment, the difference can be viewed as an off-track margin (track allowable amount). That is, Δ (off-track margin) = G−
If the eccentricity L is determined so as to satisfy L, which is the track allowable amount defined by the Japanese Industrial Standards, etc., it becomes possible to easily select a magnetic storage device that satisfies the JIS standard.

For example, L = 36 μm for a 3.5 ″ FD device of 135 TPI and L = 66 μm for a 5 ″ FD device of 98 TPI. In the case of the eccentric medium having the off-track margin as described above, the track deviation amount and the deviation direction can be obtained without misjudgment due to other error factors,
Moreover, it can be used as a GO-NOGO inspection medium.

Although not shown, if the eccentric track shown in FIG. 1 is written in all the areas accessed by the magnetic head on the surface of the magnetic storage medium, the head feed accuracy will be the same as in the above-mentioned embodiment. It can be measured for each information track. The amount of eccentricity is usually larger than the adjustment amount of the magnetic head (about 1/3 of the guard band width) and may be any distance within the guard band width. Further, it is desirable from the viewpoint of track deviation detection sensitivity that the eccentric direction is a direction in which the address block or the data block of the information block track is hit.

[0011]

As described above, the present invention does not require special inspection equipment or a measurement expert having a high degree of knowledge when measuring the alignment of the magnetic head of the magnetic storage device and the accuracy of the magnetic head feed mechanism. Not only is it necessary to separate and inspect the magnetic storage device from the system until now, but measurement can be performed easily and quickly while it is installed in the system, and system maintenance is easy. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a magnetization state region of an example of the present invention.

FIG. 2 is a diagram showing a state in which an embodiment of the present invention is read by a magnetic head.

FIG. 3 is a diagram showing a state in which an embodiment of the present invention is read by a magnetic head.

FIG. 4 is a diagram showing a configuration of an information block track according to the embodiment of the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isao Matsuzaki 32 Nishiyajima, Ota-shi, Gunma Gunma Nippon Electric Co., Ltd. (72) Shinichi Saito 32 Nishiyajima, Ota-shi, Gunma Gunma Nippon Electric Co., Ltd. Within

Claims (2)

[Claims] 1. A magnetic storage medium having an information block track having a plurality of information blocks including an address block and a data block on the same circumference and a guard band provided between adjacent information block tracks. Magnetic recording medium having a plurality of information block tracks having a width wider than the width of the guard band and written concentrically around a position separated by a predetermined distance from the rotation center position of .. 2. The magnetic storage medium according to claim 1, wherein the predetermined distance is equal to 1/3 of the width of the guard band or equal to this width.