JP2000306347A - Magnetic recording/reproducing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic recording/reproducing apparatus which can record data or can reproduce recorded data with respect to a data area of a sector even when an address ID of the sector cannot be detected. SOLUTION: This apparatus has magnetic heads 6 and 7, a carriage mechanism 9, a medium-driving motor 5, and a control part 11 which recognizes a target sector instructed from the outside on the basis of an address (p) of the target sector and makes the magnetic heads 6 and 7 access the target sector. When the address (p) cannot be detected from the recording medium, the control part 11 recognizes a sector one prior to the target sector on the basis of an address p-1 on the recording medium, makes the magnetic heads access a sector one after the recognized sector, and confirms whether or not an address of the sector one after the recognized sector agrees with an address p+1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records or reproduces information on a disk-shaped recording medium in which a plurality of sectors having a data portion for storing data and an address portion for storing an address are circularly formatted in the order of the addresses. The present invention relates to a magnetic recording / reproducing apparatus and, for example, relates to a technique for enabling recording or reproduction in a data area of a sector even when an address portion is damaged.

[0002]

2. Description of the Related Art FIG. 8 shows the recording / reading of a conventional magnetic recording / reproducing apparatus.
It is a reproduction operation flow. The recording / reproducing operation of a conventional magnetic recording / reproducing apparatus (not shown) will be described with reference to the drawings. For example, when reproducing information recorded on a certain sector of a recording track on a recording medium (not shown) in accordance with an instruction from an external device such as a personal computer (not shown), the magnetic recording / reproducing apparatus first seeks to a target recording track. In step S01, the address part (hereinafter, referred to as ID part) of the target sector P (address P) is read, and the address ID is searched (step S02). It is determined whether or not the address P as the address ID has been detected (step S03). If the address P has been detected, the data portion of the target sector P is accessed to read the data (step S04). Next, a data read error determination is performed (step S05). If the data is normal, the data is transferred to an external device and the process ends normally (step S05).
06), and in the case of an error, error processing (step S07) is performed on the external device, and the processing ends.

[0003] Also. If the address ID cannot be detected in step S02, the process proceeds from step S03 to step S0.
In step S8, the number of search retries is counted, and after the number of retries is determined (step S09), the process returns to step S02. In step S09, if the number of retries is three or more, the process proceeds to step S010, sets an error flag, and proceeds to step S05.

[0004]

As described above, in the conventional magnetic recording / reproducing apparatus, when the address P indicating the target sector P cannot be detected from the group of sectors formatted on the recording medium, the data of the target sector P is read. The data recorded in the data section could not be reproduced or the data could not be recorded in the data section.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. Even when an address part has a defect and an address ID cannot be detected, data is recorded or recorded in the data area of the sector. It is an object of the present invention to obtain a magnetic recording / reproducing apparatus capable of reproducing data.

[0006]

A magnetic recording / reproducing apparatus according to the present invention comprises: a magnetic head for accessing a disk-shaped recording medium in which a plurality of sectors having an address area and a data area are circularly formatted in address order; A carriage mechanism that supports a magnetic head at one end and moves in a seek direction; a medium drive motor that rotates a recording medium; and a target sector that is designated from the outside and is recognized on the recording medium based on the address p and the magnetic head. And a control unit for accessing the target sector.
If the target sector cannot be detected from the recording medium,
The previous sector is recognized on the recording medium on the basis of the address p-1, and the magnetic head is accessed to the sector one sector after the recognized sector, and the address of the sector one sector further matches the address p + 1. This is to confirm whether or not to do so.

Further, in the magnetic recording / reproducing apparatus of the present invention, when the control unit cannot detect the address p of the target sector from the recording medium, the control unit reads the address p-n of the predetermined number of sectors before the target sector. The magnetic head is made to access a sector after a sector difference between the recognized sector and the target sector.

In the magnetic recording / reproducing apparatus according to the present invention, when the control unit receives a write instruction from the outside to the target sector, and cannot detect the address p of the target sector from the recording medium, the control unit immediately follows the target sector. The write is performed after confirming that the address of the address P1 matches the address p + 1.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 An embodiment of the magnetic recording / reproducing apparatus of the present invention will be described. FIG. 1 is an overall view showing a magnetic recording / reproducing apparatus according to Embodiment 1, and FIG.
FIG. 3 is a block diagram of the magnetic recording and reproducing apparatus shown in FIG. 1, and FIG. 3 is an explanatory diagram showing a format of the recording medium shown in FIG.
In FIG. 1, reference numeral 1 denotes a magnetic recording / reproducing device, which is configured so that a recording medium 50 is detachable, and records information on the recording medium 50 or reproduces information recorded on the recording medium 50. 2 is an upper cover provided on the magnetic recording / reproducing apparatus 1 and 3 is a magnetic recording / reproducing apparatus 1
The recording medium 50 is inserted through the door 3a. 4 is a frame. 50 is a disk-shaped recording medium, 51 is a medium cartridge,
The storage medium 50 is stored. Reference numeral 52 denotes a shutter of the medium cartridge 51, which opens and closes a window 53.

In FIG. 2, reference numeral 5 denotes a medium drive motor, which rotates while holding a recording medium 50. Reference numerals 6 and 7 denote magnetic heads, which access the recording medium 50 and magnetically record information or reproduce the recorded information. Reference numeral 8 denotes an optical servo mechanism, which is arranged below the magnetic head 6.
Reference numeral 9 denotes a carriage mechanism. The magnetic head 7 is attached to one end of the arm 9a, the magnetic head 6 and the optical servo mechanism 8 are attached to one end of the base 9b, and the voice coil motor 10 is attached to the other end. Is provided. Carriage mechanism 9
Is mounted so as to be movable in the radial direction of the mounted recording medium 50, and arranges the magnetic heads 6 and 7 on predetermined recording tracks of the recording medium 50. A voice coil motor 10 moves the carriage mechanism 9 in the radial direction of the recording medium 50 under the control of the control unit 11. Reference numeral 11 denotes a control unit for controlling the magnetic recording / reproducing apparatus 1;
Drive control of the voice coil motor 10 and the like, recording / reproducing operation control of the magnetic heads 6 and 7, servo control using the optical servo mechanism 8, and the like are performed. Reference numeral 11a denotes a motor driver, which drives the medium drive motor 5. A laser driver 11b drives light emission of the optical servo mechanism unit 8. 1
Reference numeral 1c denotes a VCM driver, which is a voice coil motor 10c.
Drive. Reference numeral 12 denotes an interface unit, which relays exchanges with the external device 30. The magnetic recording / reproducing apparatus 1 includes an upper cover 2 to an interface unit 12. In FIG. 3, the recording medium 50 is provided with concentric recording tracks, and each recording track is provided with an ID area as an address area and a data area as a data area for each sector.

Next, the operation will be described with reference to the drawings. 4 and 5
FIG. 7 is an explanatory diagram showing a reproduction operation flow. The magnetic recording / reproducing device 1 receives an instruction from the external device 30 through the interface unit 1
2 to operate. For example, when an instruction to reproduce the information of the sector P of the recording track N is received from the external device 30, the control unit 11 drives the voice coil motor 10 by the VCM driver 11c to move the carriage mechanism unit 9, The heads 6 and 7 are arranged on the designated recording track N (step S1). At this time, the magnetic heads 6 and 7 are accurately arranged on the recording track N by using the optical servo mechanism 8. Next, the magnetic recording / reproducing apparatus 1 reproduces information recorded on the recording track N (Step S2). Next, the control unit 11 compares whether or not the reproduction address matches the address P of the designated sector P (step S3).
The magnetic head 6 accesses the data section of the sector P to reproduce the information recorded therein (step S4), and proceeds to step S12. If the reproduction address does not match the address P, the process proceeds to step S5 shown in FIG. Step S5 is a sector P- which is the sector immediately before the sector P.
1 is reproduced. Next, the reproduction address is the address P
It is compared whether or not it matches -1 (step S6). If the reproduction address matches the address P-1, the process proceeds to step S7; In step S7, data is skipped from the data portion of sector P-1 to the ID portion of sector P. Next, the magnetic head 6 accesses the data portion of the sector P to reproduce information (step S8), reproduces the address of the next sector, sector P + 1 (step S9), and the reproduced address matches the address P + 1. Are compared (step S10). If the reproduction address matches the address P + 1, the process proceeds to step S12; otherwise, the process proceeds to step S11. Step S
11 sets an error flag. In step S12, it is determined whether the data reproduced in step S4 or step S8 or the error flag is set in step S11. If there is a data error or error setting, the process proceeds to step S13, and if there is no error, the process proceeds to step S14. In steps S13 and S14, the results are transmitted to the external device 30.

As described above, according to the magnetic recording / reproducing apparatus of the first embodiment, even if the address P of the target sector P instructed from the external device 30 cannot be detected from the recording medium 50, one of them is detected. Address P of previous sector P-1
-1 is detected, the ID section and the data section of the sector P-1 and the ID section of the sector P are skipped, and the magnetic heads 6 and 7 access the data section of the sector P.
Even if there is a defect in the ID section, the information in the data section can be reproduced. Further, since it is determined whether or not the address of the sector P + 1 which is one sector after the target sector P matches the address P + 1, the address is transmitted to the external device, the reliability can be improved.

Embodiment 2 FIG. Another embodiment of the present invention will be described. FIG. 6 is an explanatory diagram showing another reproduction operation flow. In the figure, the steps before A correspond to the steps before A shown in FIG. 4, and the steps after B correspond to the steps after B shown in FIG. Next, the operation will be described with reference to the drawings. As shown in FIG. 4, for example, when receiving an instruction from the external device 30 to reproduce the information of the sector P of the recording track N, the control unit 11
The CM driver 11c drives the voice coil motor 10 to move the carriage mechanism 9, and the magnetic head 6,
7 is arranged on the designated recording track N (step S1). At this time, the magnetic heads 6 and 7 are accurately arranged on the recording track N by using the optical servo mechanism 8. Next, the magnetic recording / reproducing apparatus 1 reproduces information recorded on the recording track N (Step S2). Next, the control unit 11 compares whether the reproduction address matches the address P of the designated sector P (step S3). If the reproduction address matches the address P, the magnetic head 6 is added to the data part of the sector P.
And reproduce the information recorded therein (step S4), and then proceed to step S12.

If the reproduction address does not match the address P, the process proceeds to step S5 shown in FIG. Step S
5 reproduces the ID part of the sector P-1, which is the sector immediately before the sector P. Next, the reproduction address is the address P-1.
(Step S6). If the reproduction address matches the address P-1, the process proceeds to step S7.
If they do not match, the process proceeds to step S7a. Step S7
In this case, data is skipped from the data portion of the sector P-1 to the ID portion of the sector P. Next, the magnetic head 6 accesses the data portion of the sector P to reproduce information (step S8), reproduces the address of the next sector, sector P + 1 (step S9), and the reproduced address matches the address P + 1. Are compared (step S10). If the reproduction address matches the address P + 1, the process proceeds to step S12, and if not, the process proceeds to step S11. Step S7
In a, sector P-2 which is two sectors before sector P
Is reproduced. Next, when the reproduction address is the address P-
2 (step S7b). If the reproduction address matches the address P-2, the process proceeds to step S7c; otherwise, the process proceeds to step S11. In step S7c, the data portion of sector P-2 is
Skip to section D. Next, the magnetic head 6 accesses the data portion of the sector P to reproduce information (step S7).
d), and proceed to step S9. A step S11 sets an error flag. In step S12, it is determined whether the data reproduced in step S4 or step S8 or the error flag is set in step S11. If there is a data error or error setting, the process proceeds to step S13. If there is no error, the process proceeds to step S14. Step S13, S1
In step 4, the result is transmitted to the external device 30.

According to the magnetic recording / reproducing apparatus 1 of the second embodiment, the address P of the target sector P instructed by the external device 30 cannot be detected from the recording medium 50, and the address P of the sector P-1 immediately before that cannot be detected. Even if the address P-1 cannot be detected,
The address P-2 of the sector P-2 immediately before that is detected, and the ID part and the data part of the sector P-2 are used to detect the address P-2 of the sector P-2.
Since the magnetic heads 6 and 7 access the data portion of the sector P by skipping the D portion, the ID portion of the target sector P,
Even if there is a defect in the ID portion of the immediately preceding sector P-1, the information in the data portion can be reproduced. Further, since it is determined whether or not the address of the sector P + 1 which is one sector after the target sector P matches the address P + 1, the address is transmitted to the external device, the reliability can be improved.

Embodiment 3 Another embodiment of the present invention will be described. FIG. 7 is an explanatory diagram showing a recording operation flow. In the figure, the steps before A correspond to the steps before A shown in FIG. 4, and the steps after B correspond to the steps after B shown in FIG. Next, the operation will be described with reference to the drawings. As shown in FIG. 4, for example,
When receiving an instruction from the external device 30 to reproduce the information of the sector P of the recording track N, the control unit 11
The voice coil motor 10 is driven by the driver 11c to move the carriage mechanism 9, and the magnetic heads 6, 7 are arranged on the designated recording track N (step S).
1). At this time, the magnetic heads 6 and 7 are accurately arranged on the recording track N by using the optical servo mechanism 8. Next, the magnetic recording / reproducing apparatus 1 reproduces information recorded on the recording track N (Step S2). Next, the control unit 11 compares whether the reproduction address matches the address P of the designated sector P (step S3). If the reproduction address matches the address P, the magnetic head 6 is added to the data part of the sector P.
And reproduce the information recorded therein (step S4), and then proceed to step S12. If the reproduction address does not match the address P, the process proceeds to step S5 shown in FIG. In step S5, the ID part of the sector P-1, which is the sector immediately before the sector P, is reproduced. Next, it is determined whether the reproduction address matches the address P-1 (step S6). If the reproduction address matches the address P-1, the process proceeds to step S6a. If not, the process proceeds to step S11. In step S6a, the ID part of the sector P + 1 immediately after the sector P is reproduced. Next, it is compared whether the reproduction address matches the address P + 1 (step S6).
b) If the playback address matches the address P + 1,
Proceed to step S6c, and if they do not match, step S1
Proceed to 1. In step S6c, the ID part of the sector P-1 immediately before the sector P is reproduced. Next, it is determined whether the reproduction address matches the address P-1 (step S6d).
If the reproduction address matches the address P-1, the process proceeds to step S7; otherwise, the process proceeds to step S11. In step S7, data is skipped from the data portion of sector P-1 to the ID portion of sector P. Next, information is recorded in the data portion of the sector P (step S8a), and the process proceeds to step S12. The operations after step S11 and step S12 are the same as the operations shown in FIG.

According to the magnetic recording / reproducing apparatus 1 of the third embodiment, when information is recorded in the target sector P specified by the external device 30, the address P of the sector P cannot be detected from the recording medium 50. However, the address P-1 of the immediately preceding sector P-1 is detected, and the address P + 1 of the succeeding sector P + 1 is detected to confirm the position of the sector P on the recording medium 50. ID part of -1,
Since the data portion of the sector P is read from the data portion and the magnetic heads 6 and 7 access the data portion of the sector P to record information, even if there is a defect in the ID portion of the target sector P, the data is surely recorded. Information can be recorded in the department.

[0018]

According to the magnetic recording / reproducing apparatus of the present invention,
A magnetic head for accessing a disk-shaped recording medium in which a plurality of sectors having an address area and a data area are circularly formatted in address order, a carriage mechanism that supports the magnetic head at one end and moves in a seek direction,
A medium drive motor for rotating the recording medium; and a control unit for instructing the target sector from the outside and recognizing the target sector on the recording medium based on the address p and causing the magnetic head to access the target sector. If it cannot be detected from the recording medium, the sector immediately before the target sector is recognized on the recording medium based on the address p-1, and the magnetic head is accessed to the sector one sector after the recognized sector, and one more sector is read. Since it is checked whether or not the address of the succeeding sector matches the address p + 1, even if there is a defect in the address area of the target sector, the information in the data area can be reproduced.

According to the magnetic recording / reproducing apparatus of the present invention, when the control unit cannot detect the address p of the target sector from the recording medium, the control unit determines the address p of the sector that is a predetermined number of times before the target sector.
Since the magnetic head is recognized on the recording medium based on -n and the magnetic head is accessed to the sector after the sector difference between the recognized sector and the target sector, there is a problem in the target sector and the address area immediately before the target sector. Can also reproduce the information in the data area of the target sector.

According to the magnetic recording / reproducing apparatus of the present invention, when the control unit receives a write instruction from the outside to the target sector and cannot detect the address p of the target sector from the recording medium,
The address of the sector after the target sector is address p +
Since writing is performed after confirming that the value matches 1, information can be reliably recorded in the data area of the target sector.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a magnetic recording and reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of the magnetic recording and reproducing apparatus shown in FIG.

FIG. 3 is a detailed explanatory diagram of the recording medium shown in FIG. 1;

FIG. 4 is an explanatory diagram showing a reproduction operation flow.

FIG. 5 is an explanatory view showing the operations A and B shown in FIG. 4;

FIG. 6 is an explanatory view showing another mode of the reproducing operation.

FIG. 7 is an explanatory diagram showing a recording operation.

FIG. 8 is an explanatory diagram showing a conventional reproducing operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Magnetic recording / reproducing apparatus, 2 Top cover, 3 Front panel part, 4 Frame, 5 Medium drive motor,
6, 7 magnetic head, 8 optical servo mechanism, 9 carriage mechanism, 10 voice coil motor, 11
Control unit, 12 interface unit.

Claims (3)

[Claims] 1. A magnetic head for accessing a disk-shaped recording medium in which a plurality of sectors having an address area and a data area are circularly formatted in address order, and the magnetic head is supported at one end and moved in a seek direction. A carriage mechanism, a medium drive motor that rotates the recording medium,
A control unit for instructing the target sector from the outside and recognizing the target sector on the recording medium based on the address p and causing the magnetic head to access the target sector, wherein the control unit cannot detect the address p from the recording medium. The sector immediately before the target sector is recognized on the recording medium based on the address p-1, and the magnetic head is accessed to the sector one sector after the recognized sector, and the address of the sector one sector after the recognized sector. A magnetic recording / reproducing apparatus which checks whether or not the address matches an address p + 1. 2. When the control unit cannot detect the address p of the target sector from the recording medium, the control unit recognizes the target sector on the recording medium based on the address pn of a predetermined number of sectors before the target sector. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic head is made to access a sector after a sector difference from a target sector. 3. The control unit receives a write instruction from the outside to the target sector, and if the address p of the target sector cannot be detected from the recording medium, determines whether the address of the next sector after the target sector matches the address p + 1. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein writing is performed after confirmation.