JPH1173715A - Disk-like recording medium, and signal reproducing device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floppy disk to allow the constitution of a signal reproducing device or the like, capable of managing the version by suppressing the burden of the format or CPU or the like, as much as possible without increasing the detecting mechanism. SOLUTION: In the floppy disk, the format information F I for informing a floppy disk driving device of the difference in the format or version of the floppy disk is recorded on the servo area SA of the recording/reproducing region of user's data together with other servo information. Then, the number of bits regarded as the read-out processing unit of the reproducing device is defined by the format information FI and the other servo informations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc-shaped recording medium provided with a servo area, and a signal reproducing apparatus and method for reproducing information data recorded on the disc-shaped recording medium.

[0002]

2. Description of the Related Art In recent years, attention has been paid to high-density recording of information on floppy disks and the like.
For example, a large-capacity floppy disk exceeding several tens MB has been proposed. The floppy disk is usually housed in a thin box-shaped housing, and is mounted on the floppy disk drive while being housed in this housing.

For example, when the recording format of a floppy disk is changed or a next-generation standard is proposed, a notch or a hole for identifying the floppy disk is generally provided in the housing for storing the floppy disk. It is.

Therefore, the reproducing apparatus has a detection mechanism for detecting the notch or the like for identifying a format or the like provided in the housing. The detection mechanism is provided in, for example, a floppy disk drive.

[0005]

By the way, there are already several versions of floppy disks, and various types of large-capacity floppy disks are proposed as next-generation floppy disks due to the increase in recording density. It is considered something. Therefore, in order to recognize a floppy disk for the next generation and the next generation, it is necessary to provide a cutout or the like in the above-mentioned housing correspondingly.

However, the number of cutouts and the like provided in the housing is limited as described above. Corresponding to this, there is a limit in preparing a detection mechanism in accordance with the number of notches for identification provided on the housing on the reproducing apparatus side.

There is also a demand for minimizing the burden on a reproducing apparatus or the like in detecting the format and version of a floppy disk.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and does not require an additional detection mechanism in the reproducing apparatus. It is an object of the present invention to provide a disk-shaped recording medium on which version management can be performed.

Further, the present invention has been made in view of the above-mentioned circumstances, and it is possible to manage the format and version without adding a detecting mechanism and minimizing the load on the CPU and the like. It is an object of the present invention to provide a signal reproducing apparatus and method capable of performing the above.

[0010]

In order to solve the above-mentioned problems, the disk-shaped recording medium according to the present invention has a servo area in which a servo pattern signal is recorded for each servo frame obtained by dividing a track. Then, the format information and the servo information are written in the servo area in a certain number of bits.

In order to solve the above-mentioned problems, a signal reproducing apparatus according to the present invention comprises a reproducing means for reproducing information data recorded on a disc-shaped recording medium in units of a certain number of bits, and a reproducing means. Format information detecting means for detecting format information of the disc-shaped recording medium recorded in the servo area from the reproduced information data.

Thus, the signal reproducing apparatus detects the format information recorded in the servo area by the format information detecting means from the information data read in units of a fixed number of bits by the reproducing means.

[0013] In order to solve the above-mentioned problems, a signal reproducing method according to the present invention includes a reproducing step of reproducing information data recorded on a disc-shaped recording medium in units of a fixed number of bits; A format information detecting step of detecting format information of the disc-shaped recording medium recorded in the servo area from the reproduced information data.

Thus, in the signal reproducing method, the format information recorded in the servo area in the format information detecting step is detected from the information data read in units of a fixed number of bits in the reproducing step.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

This embodiment is a floppy disk in which a magnetic disk having a diameter of 3.5 inches is accommodated in a case, which can be carried and exchanged, and whose recording capacity is large, for example, exceeding several tens MB. . Hereinafter, the floppy disk itself will be described. In an actual supply mode of a floppy disk, it goes without saying that the disk is supplied in a case.

This floppy disk is an exchange medium that can be attached to and detached from the playback device. And this floppy disk adopts an embedded servo system that performs servo in servo frame units.
It has a servo area in which servo information and the like are recorded and a data area in which normal data is recorded.

The floppy disk uses a floppy disk drive (hereinafter, referred to as a floppy disk drive) of a reproducing apparatus to determine the format or version of the floppy disk.
It is called FDD device. ) Is recorded in a servo area of a data area in which data can be recorded and reproduced by a user, that is, a so-called user data recording / reproducing area.

For example, the format information is parameter information indicating a difference in format or version of a floppy disk on which the format information is recorded.

The floppy disk has a track number, which is used as track position information, on tracks formed outside the user data recording / reproducing area and on inner and outer peripheries outside the range of the user data recording / reproducing area. Is recorded. The tracks formed on the inner and outer circumferences outside the user data recording / reproducing area are so-called empty tracks on which normal data is not recorded.

The floppy disk has a servo area S _A as shown in FIG. 1, and records the format information F _I in the servo area S _A. 2 and 3
Shows tracks and the like formed on the floppy disk 1. As shown in FIGS. 2 and 3, the floppy disk 1 has tracks formed in the radial direction.
Track TR formed in user data recording / reproducing area
_Ui , TR _Ui-1 , ..., TR _Uk , ..., TR _Um-1 , T
R _Um and empty tracks TR _E0 , T _E formed at outer peripheral positions outside the range of the user data recording / reproducing area.
Consists R _E2, ..., and TR _Ei-1, empty tracks TR _Em + 1, which is formed on the inner circumferential position outside the range of the user data recording area, ..., and TR _En-1, TR _En Is done.

Then, as shown in FIG. 2, the floppy disk 1 has servo frames SF1, SF2,..., SF8,.
SF _h . For example, the number h of servo frames
Is 96.

As described above, the servo frame is
A data area in which data by the user is a recordable and reproducing composed of a servo area S _A of FIG. The data area is an area configured only in a servo frame in the user data recording / reproducing area,
This is an area where data can be recorded by a user or the like.

[0024] servo area S _A is the automatic gain control signal (hereinafter, referred to as AGC signal.), A servo timing mark (hereinafter, referred to. STM), Pad1
, Gray code area G _A , Pad 2, and burst patterns BP _A , BP _B , BP for tracking servo
_C, a BP _D, and the Gap is recorded. The servo area S _A is configured to be readable even if the format, modulation method, or linear density of the data area changes, as long as the read area is compatible.

For example, the recording length of each data in the servo area S _A is 80 t for the AGC signal, 14 t for the STM, and
ad1 is 2t, gray code area G _A is 72t, Pad
2 2t, burst patterns _{BP A, BP B, BP C} , B
P _D is set to 20 t, Gap is set to 5 t, and the servo area S _A is set to 255 t.

Here, 1t is a magnetic reversal interval, and is a recording length where 1t = 50 nsec when the recording frequency is 10 MHz. Therefore, in the servo area S _A , 120
μsec.

The AGC signal is a signal for establishing bit synchronization, and is a signal for clamping an AGC amplifier of the reproducing apparatus. The AGC signal is configured by, for example, setting a single signal having a recording frequency of 10 MHz and a duty of 50 for 40 wavelengths.

The STM is a bit synchronization signal used for detecting the burst pattern and the like. Also, P
ad1 is a portion having a space having a length of 2t.
For example, STM and Pad1 are recorded in a pattern as shown in FIG.

In the gray code area G _A , FIG.
(B), the format information F _I, the servo frame number SF _I, a track number T _I is the track position information is recorded. The glue code area G _A is an area in which a track number or the like is normally recorded by a gray code so that reading is possible even when the servo is unstable or not applied. The gray code is a code in which 1-bit information is associated with a pair of magnetization reversals.

As described above, the format information F _I recorded in the gray code area G _A has parameter information such as the format of the floppy disk. For example, the format information F _I includes recording format parameter information as shown in Table 1.

[0031]

[Table 1]

The servo frame number SF _I is so-called circumferential position information, and is information on the position in the circumferential direction of the servo frame on which the servo frame number SF _I is recorded.

[0033] For example, if the header without format data does not have a header, servo frame number SF _I play a role in the identification of the sector. That is,
Servo frame by the servo frame number SF _I is uniquely determined, even if not present sector header allows the recognition of the sector during data writing and reading.

As described above, the track number T _I can be read even when the servo is unstable or not applied, and the FDD device performs a seek operation based on the track number T _I. It can be performed.

[0035] For example, the gray code area G _A to the track number is recorded together with the format information F _I T _I and the servo frame number SF _I, for example, as shown in FIG. 5,
Track number T _I is recorded in the low order 12 bits of the gray code area G _A, servo frame number SFI is recorded in the upper 7 bits. For example, the servo frame number SF _I
Is also gray-coded and phase-converted and recorded.

In the phase conversion recording, for example, as shown in FIG. 7, the magnetization reversal to the positive direction is performed by switching the bit cell having a width of 3t.
At the position t, the magnetization reversal to the negative is performed, and when the bit is 0, the magnetization reversal to the negative is performed at the position 2t of the latter half of the bit cell.

The format information SF _I , servo frame number SF _I and track number T _I recorded in the gray code area G _A are readable even if the format, modulation method or linear density of the data area changes. It is configured to be. Accordingly, even if the data recorded in the data area is not recorded in a format that is acceptable playback device, format information F _I like becomes playable.

[0038] It should be noted that the format information F _I is, for example,
As shown in FIG. 6, recording is performed using the upper 5 bits. In this case, the gray code area G _A is a coding area composed of all 24 bits.

The reproducing apparatus reads data recorded on the floppy disk by the CPU, and usually performs the processing in units of a multiple of 8 such as 8 bits, 16 bits or 32 bits. Is going. In other words, for example, processing of 19-bit information is not different from processing of 24-bit or 32-bit information. Therefore, as shown in FIG.
When configured with all 24 bits including format information F _I, it is possible to read processing format information F _I at once with the track number and the servo frame number SF _I, CPU for reading processing format information F _I No additional burden is imposed.

The above burst patterns BP _A , BP _B , BP
_C, BP _D is a pattern signal, each of which is recorded at a single frequency. The above burst patterns BP _A , BP _B , B
P _C, the recording of BP _D is performed as the recording frequency is a single signal of 10MHz duty 50.

The burst patterns BP _A , BP _B , BP
_C, BP _D is the width T _P with each along the track center axis
Is formed by: (T _P track pitch), as the C-phase burst pattern BPC is to center the center axis of the odd track for example, also D-phase burst pattern BP _D, as to center to the center axis of the even track e.g. Is formed. The A-phase burst pattern BP _A and the B-phase burst pattern BP _B are the C-phase burst pattern BP
_{The C} and D phase burst pattern BPD is _shifted in the radial direction by T _P / 2
It is formed with only a deviation.

[0042] The burst patterns BP _A and burst pattern BP _B, burst pattern BP _C and the burst pattern BP _D, because in the radial direction of 2T _P is offset by T _P / 2 is formed, a 2T _P 360 When the angle is set to 0 °, the respective phases are 0 °, 180 °, 90 °, and −90 °.

For example, the burst patterns BP _A , B
P _B, BP _C, by BP _D, the servo signals U _A, U _B,
U _C, when obtaining the U _D, the equation (1) and (2) to obtain the track position signal U _X and U _Y.

[0044] _{U X = k (U A -U} B) / (U A + U B) ··· (1) U Y = k (U C -U D) / (U C + U D) ··· (2 ) here, the value k is the ratio of the width T _W and the track pitch T _P of the reproducing head (T _W / T _P).

The track position signals U _X and U _Y are mutually 90 ° as a position function in the radial direction R of the floppy disk.
° varies with a period 2T _P (= 360 °) in a different state.
The position in the radial direction is defined as an area RA ₂ where U _Y > 0 near the center axis of the track of the even address, an area RA ₄ where U _Y <0 near the center axis of the track of the odd address, and the center axis of the track. dividing the region RA ₃ of 0 <U _X in the region between the central axis of the region RA ₁ and track 0> U _X between.

Here, in the areas RA ₁ and RA ₃ , the position signal U _Y is linear, and in the areas RA ₂ and RA ₄ , the position signal U _x is linear. When the reproduction head is roughly positioned within the range of ± 1 track, final positioning can be performed over the entire area in the radial direction R by using the narrow range track position signal.

The reproducing apparatus by detecting the format information F _I recorded in the servo area as described above,
Even in the case of a floppy disk in which a notch or the like for identifying a format or the like is not provided in the housing, the identification and the version of the format or the like can be managed.

Accordingly, the reproducing apparatus does not include a notch or other detection mechanism provided in the housing for storing the floppy disk in the FDD apparatus or the like as in the related art.

[0049] Then, the playback device, by the format information F _I is recorded in the gray code area G _A as formed by a number of bits that are read processing unit of the CPU, without imposing a burden on the CPU The format information can be read and processed.

[0050] It is also to empty track located outside the user data recording area together with the track number T _I to record the format information F _I.

Here, the track number recorded on the empty track is provided so that the FDD device can grasp the current position even if the recording / reproducing head goes too far from the user data recording / reproducing area by a seek operation or the like. This is provided so that the FDD device can recognize the position of the recording / reproducing head when the head has moved out of the user data recording area. By recording the track number on the empty track in this way, it is possible to achieve pull-in to the target track without delay.

Next, embodiments of the signal reproducing apparatus and method according to the present invention will be described. In this embodiment, the format information F described with reference to FIGS.
_A floppy disk (hereinafter, referred to as a disk) recording _I in a servo area SA of a user data recording / reproducing area.
1 is a disc reproducing apparatus 50 as shown in FIG.

The disc reproducing apparatus 50 includes a reproducing head 51 for reading an information signal recorded on a signal recording surface of the disk 1, a signal amplifying circuit 52 for amplifying and outputting a reproduced signal output from the reproducing head 51, Signal amplification circuit 52
A digital signal processing circuit 53 for digitizing and outputting a reproduced signal amplified by the digital signal processing circuit, and a PLL circuit 54 for detecting and synchronizing a clock signal from the digital signal from the digital signal processing circuit 53 and synchronizing and outputting the clock signal to a subsequent circuit
And an encoder / decoder 55 for decoding a digital signal synchronized by the PLL circuit 54, an ECC circuit 56 for error-correcting the digital signal decoded and output from the encoder / decoder 55, and an ECC circuit 56. R for temporarily storing the output digital signal
An AM 57 and a host computer 65 for controlling output of digital signals recorded in the RAM 57 are provided.

The disc reproducing apparatus 50 includes a rectifying circuit 5 for rectifying and outputting a reproduced signal from the signal amplifying circuit 52.
9, a PLL circuit 60 for detecting and synchronizing a clock signal from the reproduced signal output from the rectifier circuit 59,
A servo timing mark (STM) detecting circuit 61 for detecting a servo timing mark included in the signal from the circuit 60 and outputting a signal synchronized with the servo timing;
Gray code region detection circuit 62 in synchronism with the synchronizing signal output from the TM detecting circuit 61 reads the information and the format information F _I in the gray code area of the disc
A digital arithmetic processing (DSP) circuit 63 for detecting information in the gray code area detected by the gray code area detection circuit 62 and the format information F _I ,
A frame number counter 64 for calculating a servo frame number based on the servo frame position information output from the DSP circuit 63; a tracking error detection circuit 66 for detecting a tracking error signal based on a signal output from the rectifier circuit 59; A mixing circuit 67 for sending a signal output from the DSP circuit 63, for example, a track seek signal or the like and a tracking error signal output from the tracking error detection circuit 66 to the reproducing head 51, and a spindle motor 68 for rotating the disk 1. And

The gray code area detection circuit 62 and the DSP circuit 63 constitute format information detection means for detecting format information from information data read from the disk 1. This disk reproducing device 50
Reads information data recorded on the disk 1 with a certain number of bits.

A process of detecting format information by the disk reproducing device 50 configured as described above will be described.

[0057] First, the disk reproducing apparatus 50, the gray code area detecting circuit 62 detects a gray code area G _A in the servo area S _A, notifying that detected the gray code area G _A to the DSP circuit 63.

Next, the DSP circuit 63 sets the servo area S _A
Detecting the format information F _I recorded in. D
SP circuit 63 performs a control to match the detected format information F _I. For example, the sector size and ECC length are adjusted or rejected.

As described above, the disk reproducing device 50
It is possible to detect format information F _I recorded in the servo area S _A, even disk with no notches or the like for identification of such formats to the housing,
It is possible to detect and manage the identification of the format and the like and the version and the like. Therefore, the disc reproducing device 50
The FDD device or the like does not include a notch or other detection mechanism provided in a housing for storing a floppy disk unlike the related art.

[0060]

The disk-shaped recording medium according to the present invention has a servo area in which a servo pattern signal is recorded for each servo frame obtained by dividing a track, and the format information and the servo information form a fixed number of bits. Since the data is written in the servo area, the format and version can be managed without adding a detection mechanism in the reproducing apparatus and minimizing the load on the CPU or the like of the reproducing apparatus.

Further, the signal reproducing apparatus according to the present invention comprises: reproducing means for reproducing information data recorded on a disk-shaped recording medium in units of a fixed number of bits; and reproducing the information data reproduced by the reproducing means into the servo area. Format information detecting means for detecting the format information of the recorded disk-shaped recording medium, the information data read in units of a fixed number of bits by the reproducing means is recorded in the servo area by the format information detecting means. Detected format information.

Thus, the signal reproducing apparatus can manage the format and version without adding a detecting mechanism and minimizing the load on the CPU and the like.

The signal reproducing method according to the present invention comprises a reproducing step of reproducing information data recorded on a disc-shaped recording medium in units of a fixed number of bits, and recording the information data reproduced in the reproducing step in a servo area. A format information detecting step of detecting the format information of the disc-shaped recording medium, which has been recorded in the servo area by the format information detecting step from the information data read in units of a fixed number of bits in the reproducing step. Format information can be detected.

As a result, the signal reproducing apparatus to which the signal reproducing method is applied does not require an additional detection mechanism,
Format and version management can be performed while minimizing the burden on the CPU and the like.

[Brief description of the drawings]

FIG. 1 is a data configuration diagram showing a servo area of a floppy disk according to an embodiment of the present invention.

FIG. 2 is a diagram showing positions of servo frames and tracks on the floppy disk.

FIG. 3 is a diagram showing a position of a track, which is a part of the floppy disk.

FIG. 4 shows an AG recorded on the floppy disk.
FIG. 3 is a diagram illustrating a data structure of a C signal and an STM.

FIG. 5 is a diagram showing a data structure of a servo frame number and a track number recorded in a gray code area in a servo area of the floppy disk.

FIG. 6 is a diagram showing a data structure when format information is recorded together with a servo frame number and a track number in a gray code area in a servo area of the floppy disk.

FIG. 7 is a diagram showing phase modulation recording as a recording form of each information in the gray code area.

FIG. 8 is a circuit configuration diagram showing a configuration of a signal reproduction device according to an embodiment of the present invention.

[Explanation of symbols]

1 floppy disk, 50 disk player, 6
2 Gray code area detection circuit, 63 DSP circuit, F
_I format information

Claims (6)

[Claims] 1. A disk-shaped recording medium on which information data is reproduced every fixed number of bits by a reproducing apparatus, wherein a servo area in which a servo pattern signal is recorded for each servo frame obtained by dividing a track is provided. A disc-shaped recording medium characterized in that the information and the servo information are written in the servo area with the predetermined number of bits. 2. The system according to claim 1, wherein the format information is written in the servo area by forming the fixed number of bits with track position information and circumferential position information serving as servo information. Disk-shaped recording medium. 3. A signal reproducing apparatus for reproducing information data recorded in a servo area from a disk-shaped recording medium having a servo area in which a servo pattern signal is recorded for each servo frame obtained by dividing a track, Reproducing means for reproducing information data recorded on the disc-shaped recording medium in units of a fixed number of bits; and format information of the disc-shaped recording medium recorded in the servo area from the information data reproduced by the reproducing means. A signal reproducing apparatus comprising: format information detecting means for detecting. 4. The disc-shaped recording medium has a servo area in which a servo pattern signal is recorded for each servo frame obtained by dividing a track, and the format information and the servo information form the fixed number of bits, and 4. The signal reproducing apparatus according to claim 3, wherein the signal is written in a servo area. 5. The signal reproducing apparatus according to claim 3, wherein track information and circumferential position information are written on the disc-shaped recording medium as the servo information. 6. A signal reproducing method for reproducing information data recorded in a servo area from a disk-shaped recording medium having a servo area in which a servo pattern signal is recorded for each servo frame obtained by dividing a track, A reproducing step of reproducing the information data recorded on the disc-shaped recording medium in units of a fixed number of bits; and a format information of the disc-shaped recording medium recorded in the servo area from the information data reproduced in the reproducing step. A format information detecting step of detecting the format information.