JPH0689552A - Method for operating recordable time - Google Patents

Abstract

PURPOSE:To provide method for operating a recordable time for operating surely a remaining recordable time on the disk and displaying it, in a disk recording and reproducing device recording and reproducing an audio signal on the optical disk. CONSTITUTION:An address showing the position of data and the address showing the position of an unrecorded area are recorded previously on the UTOC of the index of a magneto-optical disk 2. The address showing the position of the unrecorded area of the UTOC is read into a TOC memory 20, and by using the address showing the position of the unrecorded area, the number of cluster in the remaining recordable area is obtained. Then, the number of cluster is expressed in terms of the remaining recordable time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of calculating a recordable time suitable for displaying the remaining recordable time of a disk recording / reproducing apparatus for recording / reproducing an optical disk or a magneto-optical disk.

[0002]

2. Description of the Related Art 64 mm diameter stored in a cartridge
An optical disk recording / reproducing system (mini disk (MD) system) for recording / reproducing a digital audio signal using the optical disk or magneto-optical disk has been developed (for example, Japanese Patent Application No. 3-275067). In such an optical disc recording / reproducing system, a digital audio signal is compressed to about 1/5 and recorded by using an audio compression technique. This enables recording / recording of high-quality audio signals for about 74 minutes on a disc with a small diameter of 64 mm.
Playback is possible.

In such an optical disk recording / reproducing system, audio data is compressed and recorded in clusters of 36 sectors. Of the 36-sector cluster, 32 sectors are for data.
The remaining 4 sectors are for sub data.

At the time of reproduction, reproduction data from the optical disk is temporarily stored in a buffer memory (DRAM). Even if the digital signal on the disk cannot be read due to vibration or the like, the reproduced signal continues to be output for about 3 seconds due to the data stored in the buffer memory. By reaccessing the optical pickup to the original position and reading the signal again during that time, it is possible to prevent so-called sound skipping. This buffer memory is called a shock proof memory.

[0005]

In such an optical disk recording / reproducing system, it is possible to display the remaining recordable time. With a magnetic tape or the like, the current recording position is detected, and the remaining recording time can be obtained by presenting the time corresponding to the current recording position from the total recording time of the whole. However, in such an optical disk recording / reproducing system, audio data is compressed and recorded, and since an arbitrary position on the disk can be accessed and recorded / reproduced, it is possible that an empty area of the disk is scattered. possible. On the optical disc, data is recorded in clusters of 36 sectors,
Data cannot be recorded in an empty area of one cluster or less.

Therefore, an object of the present invention is to provide a recordable time calculating method for accurately calculating the recordable time of a disc so that the recordable time can be displayed.

[0007]

According to the present invention, in a recordable time calculation method for calculating the remaining recordable time on a disc, an address indicating a data position and a position of a non-recorded area are included in a list of the disc. Is recorded in advance, the data of the catalog is reproduced, and the remaining recordable time is calculated using the address indicating the position of the non-recorded area obtained from the data of the catalog. is there.

According to the present invention, data is recorded on the disk in units of clusters each consisting of a predetermined number of sectors, and the address indicating the position of the non-recorded area recorded in the catalog consists of the cluster address portion and the sector address portion. The remaining recordable time up to immediately before is calculated by using the cluster address part of the address indicating the position of the non-recorded area.

According to the present invention, data is compressed and recorded on the disc.

According to the present invention, in a recordable time calculation method for calculating a remaining recordable time on a disc, an index indicating a position of data and an address indicating a position of a non-recorded area are included in a catalog of the disc. The recorded data is recorded in advance, the remaining recordable time is calculated using the address indicating the position of the non-recorded area obtained from the cataloged data, and the display based on the calculated recordable time is performed. This is a method for calculating the recordable time.

According to the present invention, in a recordable time calculation method for calculating a remaining recordable time on a disc, an address indicating a position of data and an address indicating a position of a non-recorded area are included in a list of the disc. The recorded data is recorded in advance, the remaining recordable time immediately before recording is calculated using the address indicating the position of the non-recorded area obtained from the recorded data, and during recording, from the start of recording The recording time from the start of recording to the present is calculated from the number of clusters recorded up to the present, and the recording time from the start to the present is subtracted from the remaining recordable time immediately before recording to obtain the remaining recordable time. This is a method for calculating the recordable time, which is output as the remaining recordable time.

According to the present invention, in a recordable time calculation method for calculating a remaining recordable time on a disc, an index indicating a position of data and an address indicating a position of a non-recorded area are included in a catalog of the disc. Plays back the recorded data of the catalog, calculates the number of clusters in the remaining unrecorded area immediately before recording using the address indicating the position of the unrecorded area obtained from the data of the catalog, and starts recording during recording. Count the number of clusters recorded from the time to the present, subtract the number of clusters recorded from the start of recording to the present, from the number of clusters in the remaining unrecorded area immediately before recording, Recordable time when the subtraction value of the number of clusters and the number of clusters recorded from the start of recording to the present is converted into recording time and output as the remaining recordable time during recording. It is a calculation method.

According to the present invention, in a recordable time calculation method for setting a protection area in a non-recorded area and calculating a remaining recordable time on a disk for recording data, the disk inventory contains data of the data. The address indicating the position and the address indicating the position of the non-recorded area are recorded in advance, the data of the catalog is reproduced, and the address indicating the position of the non-recorded area obtained from the data of the catalog and the size of the protection area to be set are set. This is a recordable time calculation method that is used to calculate the remaining recordable time.

[0014]

The remaining recordable time is calculated by reproducing the UTOC, obtaining the number of remaining recordable clusters using the address indicating the position of the non-recorded area obtained from the UTOC, and converting the number of clusters into time. Desired.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is an optical disc recording / reproducing system (mini disc (MD) system) for recording / reproducing a digital audio signal by using an optical disc or a magneto-optical disc having a diameter of 64 mm, which is stored in a cartridge. Used when displaying the available time. As shown in FIG. 2, the magneto-optical disk 2 to which the present invention is applied has a read-only area A ₁₀ and a recording / playback area A ₂₀ provided outside the read-only area A ₁₀ . The reproduction-only area A ₁₀ has a data area A ₁₁ in which data such as performance information is recorded, and a lead-in area A ₁₂ provided on the inner circumference thereof. Lead-in area A ₁₂ is T
OC (Table Of Contentes).

The recording / reproducing area A ₂₀ of the magneto-optical disk 2 is
It has a data area A ₂₁ in which data such as performance information is recorded, and a lead-in area A ₂₂ provided on the inner periphery thereof. This lead-in area A ₂₂ is UTOC,
Track number information indicating the recording position and recording content of the recording data, address information indicating the position of each data area, and connection address information to another data area are recorded.

FIG. 3 shows the structure of the UTOC. In the data table of FIG. 3, the vertical address "0 to 3" in byte units is header data, the 12 bytes of the vertical address "0 to 2" are the synchronization signal, and the first byte of the vertical address "3" is And the second byte is assigned to the cluster address. Also, the vertical address "1"
1 "2nd and 3rd bytes P-DFA, PE
MPTY, P-FRA with vertical address "12", P-
TNOn is a pointer indicating the block definition data at the vertical address 76 and thereafter. P-DFA is a pointer indicating the start address of the defective area. P-E
MPTY is a pointer indicating the start of an unused portion of the block definition data block. PF
RA is a pointer to the start address of the freely recordable area. P-TNOn is a pointer indicating the start address of track number n. The value of the pointer P-TNOn gives the start address of the track number TNO-n given by the start address = 76 × 4 (P-TNOn) × 8.

Then, the vertical address "76-85"
Form an address table of the data area and are assigned to the start address and end address of the data area designated by the pointers P-FRA and P-TNOn. Further, the fourth byte of the even-numbered address after the vertical address "76" is assigned to various track modes such as the copyright protection mode and the rewrite prohibition mode. Then, the fourth odd-numbered address after the vertical address "76"
Bytes are assigned to a pointer Link-P that indicates a connection destination from one data area to another data area.

Based on the UTOC data, the remaining recordable time of the disc is obtained. That is, as described above, the start address of the recordable area is the pointer P
-The block definition data pointed to by the FRA is obtained.

As for the start and end addresses, as shown in FIG. 4, 14 bits from the beginning indicate a cluster, 6 bits following it indicate a sector, and 4 bits following it indicate a sound group (compression work). The smallest unit that is performed).

From the cluster address part (upper 14 bits) of the start address and the cluster address part of the end address of the block definition data pointed by the pointer P-FRA, the number of clusters in the recordable area is obtained. When the recordable area continues, the link destination of the subsequent recordable area is indicated by Link-P. From the cluster address part of the start address and the cluster address part of the end address of the block definition data pointed to by this Link-P, the number of clusters in the recordable area that follows can be obtained. The remaining recordable time can be obtained by multiplying the number of remaining clusters of the disc thus obtained by the playing time per cluster.

In the case of stereo, the sampling frequency is 4
At 4.1 KHz, there are 512 samples per sound group. The number of sound groups per sector is 5.5, and the number of sectors per cluster is 32. Therefore, the playing time per cluster is (1 / 44.1 kHz) × 512 × 5.5 × 32 = 2.04 seconds.

As shown in FIG. 5A, the beginning and end of the remaining recordable area do not match the beginning and end of the cluster, and the beginning and end of the remaining recordable area and the cluster as shown in FIG. 5B. When the beginning coincides with the beginning or when the end of the remaining recordable area coincides with the end of the cluster as shown in FIG. 5C, or as shown in FIG. 5D, the beginning of the remaining recordable area coincides with the beginning of the cluster. The number of recordable clusters is different when they match and when the end of the remaining recordable area and the end of the cluster match.

That is, also in the case of FIG. 5A, FIGS.
Also in the case of D, the number of clusters obtained by subtracting the cluster address part of the start address and the cluster address part of the end address is "4", which are all the same. However, in the case of FIG. 5A, since the remaining cluster C1 at the head and the head TC of the cluster do not match, data cannot be recorded in the first cluster C1. Also, since the end of the last cluster C5 does not match the end EC of the cluster, data cannot be recorded in the last cluster C5. Therefore, the number of clusters that can record data is C2 to C.
There are 4 "3" clusters.

On the other hand, as shown in FIG. 5B, when the leading cluster C1 and the leading TC of the cluster match,
Since data can be recorded also in the first cluster C1, the number of clusters in which data can be recorded is “4” clusters C1 to C4. Also, as shown in FIG. 5C, the first cluster C
If 5 and the last EC of the cluster match, data can be recorded in the last cluster C5 as well, so the number of clusters in which data can be recorded is “4” clusters of C2 to C5. Further, as shown in FIG. 5D, the first cluster C1
Matches the first TC of the cluster and the last cluster C
If 5 corresponds to the last EC of the cluster, the number of clusters that can record data is “5” clusters of C1 to C5.

Therefore, if the beginning cluster C1 and the beginning TC of the cluster and the end EC of the last cluster C5 and the end EC of the cluster do not match, the number of recordable clusters is the cluster address part of the start address and the cluster of the end address. It is the number of clusters obtained by subtracting "1" from the value obtained by subtracting the address part. If the first cluster C1 and the first TC of the cluster match, or the last cluster C5
If the end of and the end EC of the cluster match, the number of recordable clusters is the number of clusters obtained by adding “1” to it.

FIG. 6 is a flowchart showing a process for calculating the remaining recordable time of the disc from the UTOC data. In FIG. 6, the UTOC data is read (step 51). Then, the pointer PF
RA is read (step 52), pointer P-FR
The start address and end address of the block definition data pointed to by A are read (step 53). Pointer P
The block definition data indicated by -FRA is at the ((P-FRA value x 8) + (76 x 4)) byte.

The number of free clusters is initialized to "0" (step 54). Then, it is determined whether or not the start address matches the beginning of the cluster (step 5).
5). If the start address matches the beginning of the cluster, "1" is added to the number of free clusters (step 56), and then it is determined whether the end address matches the end of the cluster (step). 57). If the start address does not match the start of the cluster in step 55, then in step 57 it is determined whether the end address matches the end of the cluster.

In step 57, if the end address and the end of the cluster match, "1" is added to the number of free clusters (step 58). Then, the cluster address part of the start address and the cluster address part of the end address are subtracted, and 1 is subtracted therefrom (step 59). If the end address does not match the end of the cluster in step 57, then step 59
At, the cluster address part of the start address and the cluster address part of the end address are subtracted, and then 1 is subtracted.

Link- of the block definition data
P is read (step 60). If Link-P is "0", the number of free clusters is multiplied by the reproduction time per cluster (2.04 seconds for stereo) to obtain the remaining recording time (step 62). Step 60
If Link-P is not "0", the start address and end address of the block definition data pointed to by Link-P are read (step 63), and the process returns to step 55 to start the block indicated by this Link-P. The number of clusters is obtained from the address and the end address in the same manner as described above, and the remaining recording time is obtained from the number of clusters.

By the way, in such an optical disk recording / reproducing system, by the track jump at the time of writing,
It is recommended to provide a card band so that the previously recorded data of adjacent clusters will not be affected. That is, as shown in FIG. 7, one cluster between the previously recorded area and the start of the unrecorded area to be recorded this time and one cluster between the previously recorded area and the unrecorded area to be recorded this time are the guard band GB. It is said that By providing such a guard band GB, it is possible to prevent the pickup from moving to the adjacent recorded area due to the shock of the tract jump at the time of recording and the data in the recorded area is erased. The size of the guard band GB can be set for each device depending on the accuracy of movement of the pickup during a track jump.

When the guard band GB is provided in this manner, the number of clusters corresponding to the guard band GB is subtracted from the number of clusters obtained from the start address and the end address when obtaining the remaining recordable time. At this time, a value obtained by subtracting the number of clusters corresponding to the guard band from the number of clusters obtained from the start address and the end address may be negative. In this case, the number of recordable clusters is treated as “0”.

That is, FIG. 8 shows the processing when the guard band is provided in this way. In FIG.
The UTOC data is read (step 71). Then, the pointer P-FRA is read (step 7
2) The start address and end address of the block definition data pointed by the pointer P-FRA are read (step 73).

The number of free clusters is initialized to "0" (step 74). Then, it is determined whether or not the start address matches the beginning of the cluster (step 7).
5). If the start address matches the start of the cluster, "1" is added to the number of free clusters (step 76), and then it is determined whether the end address matches the end of the cluster (step 76). Step 77).
If the start address does not match the start of the cluster in step 75, then in step 77 it is determined whether the end address matches the end of the cluster.

In step 77, when the end address and the end of the cluster match, "1" is added to the number of empty clusters (step 78). Then, the cluster address part of the start address and the cluster address part of the end address are subtracted, and 1 is subtracted therefrom (step 59). If at step 77 the end address does not match the end of the cluster, then at step 79 the upper 14 bits of the start address and end address are subtracted and then 1 is subtracted.

Further, the number of clusters corresponding to the guard band (for example, 2 clusters) is reduced (step 80).
Then, it is determined whether the number of clusters obtained by subtracting the number of clusters corresponding to the guard band is 1 or more (step 8).
1). If the number of clusters obtained by subtracting the number of clusters corresponding to the guard band is 1 or more in step 81, Link-P of the block definition data is read (step 83).
If the number of clusters obtained by subtracting the number of clusters corresponding to the guard band is not 1 or more in step 81, the number of empty classes is set to "0" (step 82), and Link-P of the block definition data is read (step 82). 8
3).

If Link-P is "0", the number of empty clusters is equal to the reproduction time per cluster (for stereo, 2.0).
4 seconds) is multiplied to obtain the remaining recording time (step 86). If Link-P is not "0" in step 84, the start address and end address of the block definition data pointed to by Link-P are read (step 85), the process returns to step 75, and the block indicated by this Link-P is read. From the start address and end address of
Similarly to the above, the number of clusters is obtained, and the remaining recording time is obtained from the number of clusters.

FIG. 1 shows an example of an optical disc recording / reproducing apparatus to which the present invention can be applied. In FIG. 1, a magneto-optical disk 2 is rotated by a spider motor 1. At the time of recording, for example, a modulation magnetic field according to recording data is applied to the magnetic head 4 in a state where the optical head 3 irradiates the laser beam. During reproduction, laser light is emitted from the optical head 3 along the recording track of the magneto-optical head 2.
As a result, the data is optically reproduced from the output of the optical head 3.

The output of the optical head 3 is supplied to the RF circuit 5. The output of the RF circuit 5 is supplied to the servo control circuit 6 and the decoder 21. The servo control circuit 6 includes a focus control circuit, a tracking control circuit, and a sled servo circuit. The focus control circuit controls the focus of the optical system of the optical head 3 so that the focus error signal becomes "0". Further, the tracking servo circuit controls the tracking of the optical system of the head 3 so that the tracking error signal becomes "0". Further, the spindle motor servo control circuit controls the spindle motor 1 so as to drive the magneto-optical disk 2 to rotate at a predetermined rotation speed. Further, the optical head 3 and the magnetic head 4 are moved to the target track position of the magneto-optical disk 2. The servo control circuit 6 that performs such various control operations supplies the system controller 7 with information indicating the operating state of each unit controlled by the servo control circuit 6.

The system controller 7 is connected to a key input operation section 8 and a display section 9. The input from the key input operation unit 8 is given to the system controller 7, and thereby the operation mode is set. System controller 7
Is the optical head 3 and the magnetic head 4 based on the address information reproduced from the recording track of the magneto-optical disk 2.
Manages the recording and playback positions on the recording track being traced by.

At the time of recording, an analog audio signal is supplied from the input terminal 10 through the low-pass filter 11. This analog audio signal is supplied to the A / D converter 12. The A / D converter 12 converts the analog audio signal into 2ch × 16bit × 44.1kHz≈1.4.
Digitize at a data rate of Mbit / s. The output of the A / D converter 12 is supplied to the compressor 13.

The compressor 13 compresses the digital audio signal from the A / D converter 12 by a high efficiency coding process. As a result, audio data with a data rate of 1.4 Mbit / s is about 1/5 of 300
It is compressed to a data rate of kbit / s. As a result, the data transfer rate is converted from 75 sectors / sec to about 15 sectors / sec.

This compressed audio signal is the RAM 1
4 is supplied. The RAM 14 is used as a buffer memory for temporarily storing the compressed audio signal supplied from the compressor 13 and recording the compressed audio signal on a disk as needed. That is, the transfer rate of the compressed audio data supplied from the compressor 13 is about 1 / standard.
5, which is reduced to about 15 sectors / second, and the compressed data is continuously written in the memory 14. It is sufficient to record one sector for every five sectors of this compressed data.
Since it is very difficult to record every 5 sectors in real time, data transfer of 75 sectors / second is performed in units of clusters each including a predetermined plurality of sectors (for example, 32 sectors + several sectors) through the pause period. It is done in bursts at speed. That is, in the memory 14, compressed audio data continuously written at a low transfer rate of 15 (= 75/5) sector seconds according to the bit compression rate is read out in a burst at a transfer rate of 75 sectors / second. Be done.

The compressed audio data read out from the memory 14 in bursts is supplied to the encoder 15. Here, in the data string supplied from the memory 14 to the encoder 15, the unit continuously recorded in one recording is a cluster composed of a plurality of sectors. As shown in FIG. 9, one cluster consists of 36 sectors, which is 32 sectors.
It is composed of main data of a sector and sub data of 4 sectors. One sector consists of 2352 bytes. By performing such cluster unit recording, it is not necessary to consider mutual interference due to interleaving between other clusters. Further, if the recording data cannot be recorded politically at the time of recording due to defocusing, tracking deviation, or other malfunctions, re-reading can be performed in cluster units.

The encoder 15 performs coding processing for error correction (parity addition and interleave processing) on the recording data supplied in burst from the RAM 14, and EFM-modulates it. This encoder 1
The output 5 is supplied to the magnetic head drive circuit 16. The magnetic head drive circuit 16 is connected to the magnetic head 4, and drives the magnetic head 4 so that a modulation magnetic field according to recording data is applied to the magneto-optical head 2.

Next, the time of reproduction will be described. At the time of reproduction, the recording data of the magneto-optical disk 2 is reproduced by the optical head 3, and this reproduction signal is supplied to the RF circuit 5.
The output of the RF circuit 5 is supplied to the decoder 21. The decoder 21 corresponds to the encoder 15 in the recording system, performs EFM demodulation of the reproduced signal, and performs error correction coding processing on the demodulated signal. The output of the decoder 21 is supplied to the RAM 22. Data from the decoder 21 is written in the RAM 22 in bursts at a transfer rate of 75 sectors / second. The data written in the memory 22 is continuously read at a transfer rate of 15 sectors / second.

The system controller 7 stores the TOC data and the UTOC data read from the magneto-optical disk 2 into the T-data.
It is stored in the OC memory 20 and the recording position and the reproducing position are managed based on this TOC data.

The output of the memory 22 is supplied to the decompressor 23. The decompressor 23 corresponds to the recording-system compressor 13, and decompresses compressed audio data about 5 times,
Play back digital audio data at a transfer rate of 75 sectors / second. The output of the decompressor 23 is supplied to the D / A converter 24 and the digital output circuit 27. The output of the digital output circuit 27 is output from the output terminal 26.

The D / A converter 24 converts the digital audio signal into an analog audio signal. This analog audio signal is output from the output terminal 26 via the low pass filter 25.

In the optical disk recording / reproducing apparatus to which the present invention is applied, at the time of recording, the recordable time of the disk is displayed on the display section 9, as shown in FIG. FIG. 10 shows a display before the start of recording. Before the start of recording, the display 9
Track number display 41 and remaining recordable time display 4
2 is done. 11A and 11B show a display during recording. During recording, the display unit 9 displays a track number display 41, a remaining recording time display 42, and a current recording time display 43. As the recording time of this time advances, as shown in FIG. 11B, the recording time display 43 of this time advances, and the remaining recording time 42 decreases accordingly.

The recordable time of this disc is obtained from the disc management information of the UTOC as described above.
Then, the recordable time is displayed in the following manner.

As shown in FIG. 12, before recording, it is judged whether or not the disc 2 is inserted (step 1
01), if the disc 2 is inserted, the disc management information of the UTOC is read into the TOC memory 20 (step 102). As described above, the remaining disc recordable time is obtained from the disc management information (step 103). Then, the remaining recordable time of this disc is displayed on the display unit 9 (step 104).

As shown in FIG. 13, when recording is in progress, while recording audio data on the disk 2 (step 111), the recording time is counted (step 1).
12). The disc recordable time is recalculated based on the recording time (step 113). Then, the remaining recordable time of this disc is displayed on the display unit 9 (step 114), and it is judged whether or not the recording is completed (step 115). If the recording is not completed, the process returns to step 111 to record the audio data. And step 11
The recording time is counted in 2, the remaining recordable time is recalculated in step 113, and the remaining recordable time is displayed in step 114.

In the above example, the remaining recordable time during recording is displayed by obtaining the recorded time up to the present and subtracting the recorded time up to the present from the recordable time on the disc immediately before recording. The number of audio data clusters recorded so far is calculated, and the number of audio data clusters recorded so far is subtracted from the number of clusters that can be recorded on the disc immediately before recording, and this number of clusters is converted to time. You may make it display it.

In the embodiment of the present invention, the display unit 9
Although the remaining recordable time is displayed as a numerical value in Fig. 14, the remaining recordable time may be displayed as a bar graph as shown in Fig. 14. Further, when the remaining recordable time becomes equal to or shorter than a predetermined time, an indicator lamp may be turned on or a warning sound may be emitted by a buzzer.

[0056]

According to the present invention, the UTOC is reproduced,
The remaining recordable time is obtained by calculating the number of remaining recordable clusters using the address indicating the position of the unrecorded area obtained from the UTOC and converting the number of clusters into time. Therefore, the remaining recordable time can be displayed at the time of recording in the optical disc recording / reproducing system.

[Brief description of drawings]

FIG. 1 is a block diagram of an example of an optical disk recording / reproducing apparatus to which the present invention can be applied.

FIG. 2 is a plan view used for explaining a magneto-optical disk to which the present invention can be applied.

FIG. 3 is a schematic diagram used to describe an embodiment of the present invention.

FIG. 4 is a schematic diagram used for explaining an address in the embodiment of the present invention.

FIG. 5 is a schematic diagram used for explaining the present invention.

FIG. 6 is a flowchart used to describe an embodiment of the present invention.

FIG. 7 is a schematic diagram used for explaining a guard band in the embodiment of the present invention.

FIG. 8 is a flowchart used for explaining another embodiment of the present invention.

FIG. 9 is a schematic diagram used to describe a cluster in an example of the present invention.

FIG. 10 is a plan view used for explaining a display section of an optical disc recording / reproducing apparatus to which the present invention is applied.

FIG. 11 is a plan view used for explaining a display section of an optical disc recording / reproducing apparatus to which the present invention is applied.

FIG. 12 is a flowchart used for explaining display of a recordable time in a disc recording / reproducing apparatus to which the present invention is applied.

FIG. 13 is a flowchart used for explaining display of recordable time in a disc recording / reproducing apparatus with light to which the present invention is applied.

FIG. 14 is a flow chart used for explaining another example of the display of the recordable time in the disc recording / reproducing apparatus to which the present invention is applied.

[Explanation of symbols]

 2 Magneto-optical disk 7 System controller 9 Display section 20 TOC memory 42 Remaining recordable time display 43 Current recording time display

Claims (7)

[Claims] 1. A recordable time calculation method for calculating the remaining recordable time on a disc, wherein an address indicating a data position and an address indicating a non-recorded region are previously recorded in the list of the disc. A recordable time calculating method for reproducing the data of the list, and calculating the remaining recordable time using an address indicating the position of the non-recorded area obtained from the data of the list. 2. Data is recorded on the disk in units of clusters each including a predetermined number of sectors, and an address indicating a position of a non-recorded area recorded in the list includes a cluster address portion and a sector address portion. 2. The recordable time calculating method according to claim 1, wherein the remaining recordable time up to immediately before is calculated by using the cluster address portion of the address indicating the position of the non-recorded area. 3. The recordable time calculation method according to claim 1, wherein data is compressed and recorded on the disc. 4. A recordable time calculation method for calculating the remaining recordable time on a disc, wherein the list of the disc has an address indicating a position of data and an address indicating a position of a non-recorded area in advance. The recorded data is reproduced, the remaining recordable time is calculated using the address indicating the position of the non-recorded area obtained from the above-mentioned data, and the display based on the calculated recordable time is displayed. Recordable time calculation method to be performed. 5. A recordable time calculating method for calculating a remaining recordable time on a disc, wherein an index indicating a position of data and an address indicating a position of a non-recorded area are previously stored in the list of the disc. When the recorded data is played back, the remaining recordable time immediately before recording is calculated using the address indicating the position of the non-recorded area obtained from the above data, and during recording, when recording starts Recording time from the start of recording to the present is calculated from the number of clusters recorded from to the present, and the remaining recording time from the start to the present is subtracted from the remaining recordable time immediately before the recording Is calculated and is output as the remaining recordable time during recording. 6. A recordable time calculating method for calculating the remaining recordable time on a disc, wherein the list of the disc has an address indicating a position of data and an address indicating a position of a non-recorded area in advance. When the recorded data is reproduced, the number of clusters in the remaining non-recorded area immediately before recording is calculated using the address indicating the position of the non-recorded area obtained from the data in the above-mentioned catalog. Count the number of clusters recorded from the start to the present, subtract the number of clusters recorded from the start of recording to the present to the remaining number of clusters immediately before recording The subtracted value of the number of clusters in the non-recorded area and the number of clusters recorded from the start of recording to the present is converted into the recording time and output as the remaining recordable time during recording Recordable time calculation method. 7. A recordable time calculating method for calculating a remaining recordable time on a disc for recording data by setting a protection area in a non-recorded area, wherein the list of the data indicates the position of the data. And an address indicating the position of the non-recorded area are recorded in advance, the address of the non-recorded area obtained from the data of the above-mentioned catalog is reproduced, and the size of the protection area to be set. The remaining recordable time is calculated by using the recordable time calculation method.