JPH0414675A - Recording or playback device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a recording or reproducing device.

[Prior art] For example, the still video floppy conference
A format has been established for recording video, audio, and data on inch floppies, and according to this format,
On each of the 50 tracks, any one of video (two tracks are used consecutively during frame recording), time-compressed audio, and data can be recorded on a track-by-track basis. Also, as an optional format, a cue track can be provided on the 52nd track. However, the fifth
One track must be unrecorded. The indexes of the 1st to 50th tracks can be recorded on the cue track. The 50-track format, or a format with cue tracks added thereto, is called the basic format.

Based on this still video floppy standard,
When recording data on 50 tracks, the format capacity is 819 hides, but in order to further increase the recording capacity, proposals have been made to increase the number of tracks on the outer and inner sides. According to this, the format capacity is 1
Can be expanded to 47MB. Hereinafter, this format will be referred to as the extended format, and the track number in this case will be
19-01 for the outer circumference expansion bone 5 for the inner circumference expansion
1 to 70.

When recording digital data on a magnetic disk, a table of contents (table of contents) is used to record track management information for each data file.
index) track. Still/
On a video floppy, the cue track or tracks 1 to 5
You can manage files for 0 tracks, but you cannot manage files for extended bones in extended format. Therefore, when recording data in the extended format, it is convenient to manage files by using any of the extended tracks or dedicated tracks other than the 19th to 70th tracks as index tracks.

[Problem to be Solved by the Invention] However, when a magnetic disk on which video, audio, or data has been recorded in a basic format is set in a recording/playback device compatible with an extended format and an attempt is made to record in the extended portion, ~70t - Had to format all of the racks again. That is, the contents already recorded on the 1st to 50th tracks may be destroyed, and important recorded contents may be accidentally deleted.

In the above example, in addition to the 50 tracks, recording is performed on 20 tracks on the inner circumference side and 20 tracks on the outer circumference side.
The present invention is not limited to this, and the same applies to devices that record in an extended area other than the basic area.

Therefore, an object of the present invention is to provide a recording or reproducing device that eliminates such inconveniences.

[Means for Solving the Problems] A recording or reproducing device according to the present invention records and/or records data on a recording medium that can freely record data according to a basic format for setting a basic area and an extended format for setting a basic area and an extended area. This is a playback device, and is characterized by issuing a predetermined warning if there is a recorded track in the basic area when performing extended formatting. Also,
The present invention is characterized in that when performing extended formatting, if there is a recorded track in the basic area, the recorded track is not formatted.

[Operation] The above means can prevent the recorded contents of recorded tracks from being destroyed or lost.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a configuration block diagram of an embodiment of the present invention.

The magnetic disk 10 has a basic format applied to the first to 50th trunks, and in this embodiment, the outermost 19th track, which is an extended track, is used as a table of contents (index) track. The system control circuit 48 is
A spindle motor 44 rotates the magnetic disk 10 at a predetermined speed, and a step motor 46 moves the magnetic head 12 to a designated track position.

The data recording track format of the magnetic disk 10 is shown in FIG. As shown in FIG. 11(a), a track consists of an index and four sectors, each separated by an unrecorded area called a gap.

The index is a rotation standard for recording and reproducing data on the magnetic disk 10, and is 10001000100.
01...". Each sector is divided into 44 hide units called frames, as shown in FIG. It has a start position prediction signal, which allows the hide boundary, frame boundary, and frame address to be determined.The data frame is shown in FIG. 11(d).
It has a 4-hide frame header, 32 bytes of coding data, and 4 bytes of ECC parity. In addition to a synchronization signal, the frame header has sub data, a frame address, and parity for these.

ID information is distributed and recorded in the frame header of each data frame in sub-form. Furthermore, Figure 11 (C
), a similar copy is placed in the sub-frame immediately after the synchronization frame.

A duplex Riet-Solomon code is used for error detection and correction (FCC), and either a C1 sequence or an interleaved C2 sequence is used. As the modulation method, a method of performing 8-10 conversion and NRZ I modulation is adopted.

Data recorded on the magnetic disk 10 is reproduced as follows. That is, the reproduced output of the magnetic head 12 is applied to the comparator circuit 32 via the switch 14, preamplifier 26, and equalizer 28, and is converted into a pulse. PLL circuit 3
0 forms a clock synchronized with the pulse output of the comparison circuit 32, and according to the clock, the lo-8 demodulation circuit 34 demodulates the pulse output of the comparison circuit 32 by NRZI demodulation and 10-8 demodulation.
Convert. The output of the 10-8 demodulation circuit 34 is stored in the memory 20.

The memory 20 stores data of subframes and data frames shown in FIGS. 4(c) and 4(d). Also,
The index detection circuit 36 detects the rotation timing signal of the magnetic disk 10 from the pulse signal from the comparison circuit 32 and supplies it to the system control circuit 48 . The system control circuit 48 can know the beginning of each sector from the output of the index detection circuit 36. An ECC (error correction coding and error correction) circuit 38 performs error correction on the data stored in the memory 20 using a dual Riet-Solomon code, and stores the data in the memory 20 again.

The operation in FIG. 1 will be explained with reference to FIGS. 2 to 5.

After the initial setting (St), the system control circuit 48 waits for the magnetic disk 10 to be loaded (S2), and then rotates the spindle motor 44 (S3). The PG coil 40 outputs one pulse per rotation in accordance with the rotation of the magnetic disk 10, and the PG detection circuit 42 shapes the pulse. P
The output of the G detection circuit 42 (PG double signal) is applied to the system control circuit 48 and the spindle motor 44. The spindle motor 44 compares the PG double signal with an internal reference signal to move the magnetic disk 10 to a predetermined position. The system control circuit 48 determines a data starting position, which is a reference for rotation of the magnetic disk 10, from the PG multiplication signal.

When the rotation of the magnetic disk 10 by the spindle motor 44 becomes stable, the system control circuit 48 reads track management information from the table of contents track (for example, the outermost 19th track) and stores it in the memory 54 (S4). That is, as shown in FIG. 3, the system control circuit 48 uses the step motor 46 to move the magnetic head 12 to the table of contents track and reproduce the recorded content (Sll). By the output of the index detection circuit 36, an index signal (bit string shown in FIG. 11(a)"...10001000
10001...'') 313), and if so, read the sector data stored in the memory 20 of the track and store it in the memory 54 (S14). It is a track map that shows the volume label, file directory, and usage status of each track.The file directory includes the file name, record length, first sector frame address, last sector frame address, etc. From these, it is possible to know in which sector/frame of the first 18 to 70 tracks each file is recorded.In addition, the track map indicates whether each track is for video recording, audio recording, or data recording. Index detection circuit 3
If no index signal is detected, the unformatted code is stored in the memory 54 (S15).

The table of contents processing (S4) is ended by S14 or S15, and the process returns to the flowchart of FIG. After completing the table of contents processing, the system control circuit 48 selects the 1st to 50th tracks or the 1st to 5th tracks.
2 tracks (if the cue track is included) are prescanned (S5). A flowchart of the prescan (S5) is shown in FIG. The system control circuit 48 causes the step motor 46 to sequentially move the magnetic head 12 to each of the 1st to 50th or 52nd tracks (S21,
526), it is determined whether data is recorded for each track 522), and if it is a data track,
The subcode is stored in the memory 54 (523), and the memory 5
The data track code is stored in the track map area No. 4 (S24). If it is not a data track, the unidentifiable code is stored in the track map of the memory 54.
It is stored in the area (S25). Note that whether or not it is a data track can be determined by whether or not the index detection circuit 36 detects the index signal shown in FIG. Can be obtained from stored data. Of course, this subcode can also be used to determine whether the track is a data track or not.

After completing the pre-scan (S5), the system control circuit 48 determines whether the magnetic disk 10 is formatted or not based on whether or not the unformat code is stored in the memory 54 (S6), and determines whether the magnetic disk 10 is formatted or not. If the series of processes has been completed and the format has not been completed, it is determined in response to the input from the input device 50 (S7) whether or not there is a recorded track among the tracks in the basic area based on the track map data. S8) If there are recorded tracks, a warning is given by light, sound, vibration, text, etc. on the display device 52 (S9), and if there are no recorded tracks, formatting is executed (SIO).

A flowchart of the format (SIO) is shown in FIG. The system control circuit 48 places the magnetic head 1 on the first track to be formatted (for example, the 19th track).
2 (S31) and switch 14 to erase circuit 58.
The erase circuit 58 generates an erase current to erase the recorded contents of the track (S32). Then, the system control circuit 48 generates an index signal from the index generation circuit 56 in synchronization with the PG double signal from the PG detection circuit 42, applies it to the magnetic head via the switch 17, the recording amplifier 16, and the switch 14, and applies it to the magnetic head through the switch 17, recording amplifier 16, and switch 14. Record it on the track (S33).

System control circuit 48 also forms the data format of FIG. 11 on memory 20. That is, the required ID
Information is arranged in a subcoat, a predetermined value (for example, 00H) is arranged as coding data, interleaved with a Reed-Solomon code or a double Reed-Solomon code by the ECC circuit 38, and a predetermined parity is added. Also, signals necessary for the frame header and synchronization frame are placed together with parity.

The system control circuit 48 reads out the previously recorded index signal from the magnetic disk 10, reads out the stored data in the memory 20, and 8-10 modulation circuit 1
8, the signal is applied to the magnetic head 12 via the switch 17, the recording amplifier 16, and the switch 14, and is recorded in the target sector of the target track of the magnetic disk 10. In this way,
Sector #0 of the destination track. #l, #2. It is recorded in #3 (S34). After sector formatting is completed, if there is a next track to be formatted (S35), the magnetic head 12 is moved to that track (Sll) and the same process is repeated.

After formatting all the tracks to be formatted, move the magnetic head 12 to the table of contents track (S36).
), records that the formatted track has been formatted in the table of contents track (S37). Then, return to FIG.

FIG. 6 shows an operation flowchart that is a modification of FIG. The same parts as in FIG. 2 are given the same reference numerals. In FIG. 6, if there are recorded tracks (S8), a format exclusion code is set for each track in the basic area and stored in the track map area of the memory 54 (
S40). If there are any recorded tracks (S8) and after exclusion setting (S40), the format shown in FIG. 8 is performed (S41).

FIG. 8 is a modification of FIG. 5, and the same operations as in FIG. 5 are given the same reference numerals. In FIG. 8, after the magnetic head 12 is moved to the target trunk (S31), it is determined whether the target track is a format exclusion track based on the track map area (542), and if it is not an exclusion track, the Similarly to Figure 5, erase (S32)
, index area recording (S33) and sector format recording (S34) are performed, and in the case of an excluded track, S32, 33 and 34 are bypassed.

FIG. 7 shows a flowchart that is a further modification of FIG.

In FIG. 7, if there is a recorded track (S8), a format exclusion code is set for the recorded track and stored in the track map area of the memory 54 (S43). If there are any recorded tracks (S8) and after exclusion setting (S43), the format shown in FIG. 8 is performed (S41).

FIG. 9 shows a block diagram of another embodiment of the present invention. The same components as in FIG. 1 are given the same reference numerals. In this embodiment, a recording track detection circuit 60 is provided which determines whether or not recording has been completed by performing envelope detection on the output of the preamplifier 26. Since the recording track detection circuit 60 is provided in this way, the bliscan in FIG.
It can be changed as shown in Figure 0. That is, after moving the magnetic head 12 to the target track (S51), it is determined whether or not recording has been completed based on the output of the recording track detection circuit 60, and for the recorded track, the track map of the memory 54 is used.
Store the recorded track coat in the area (S53
). After S53, and if it is not a recorded track (S
52), to determine whether to move to the next track 554
), if necessary, return to S51; if not, return to the main routine shown in FIG. 2, FIG. 6, or FIG. 7.

In the above embodiment, the same magnetic head is used for recording/reproducing and erasing, but it goes without saying that a separate erasing head may be provided.

The present invention is applicable to various formats, not limited to the examples described above. For example, even in a disk-shaped recording medium, the basic area has 50 tracks, and the extended area has 50 tracks each.
It may also be an area between tracks.

[Effects of the Invention] As can be easily understood from the above description, according to the present invention, it is possible to prevent the recording signal in the basic area from being destroyed when performing extended formatting.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the configuration of an embodiment of the present invention, Fig. 2 is a flowchart of the main routine of Fig. 1, Fig. 3 is a flowchart of reading the table of contents, Fig. 4 is a flowchart of Briscan, and Fig. Format flowchart,
FIG. 6 is another flowchart of the main routine, FIG. 7 is yet another flowchart of the main routine, FIG. 8 is a flowchart in the format of FIGS. 6 and 7, and FIG. 9 is another embodiment of the present invention. FIG. 10 is a flowchart of the bliscan in FIG. 9, and FIG. 11 is a data recording track format of the magnetic disk. 10: Magnetic disk 12: Magnetic head 2o: Memory 22: Input/output circuit 36. Index detection circuit 5
6: Index generation circuit 38: ECC circuit 48 System control circuit

Claims (2)

[Claims] (1) A device that records and/or reproduces data on a recording medium that can freely record data according to a basic format that sets a basic area and an extended format that sets a basic area and an extended area, and when performing an extended format, the basic A recording or reproducing device characterized in that a predetermined warning is issued when there is a recorded track in the area. (2) A device that records and/or reproduces data on a recording medium that can freely record data according to a basic format that sets a basic area and an extended format that sets a basic area and an extended area, and when performing the extended format, the basic A recording or reproducing device characterized in that when there is a recorded track in an area, the recorded track is not formatted.