JPS63108568A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce a stand-by turning time for access to data of the adjacent cylinder (track) by making a format shifted by a specific period between the adjacent cylinders. CONSTITUTION:When a plural number of disks are driven to rotate by a disk drive 10, an index pulse is outputted from the drive 10 at every turning of the disks. Then a disk controller 11 starts for the format to be performed by the timing of the index pulse if a sought cylinder is an even numbered one. In case of the cylinder whose number is odd, the controller then executes the format with new index pulse shifted by specific period from the index pulse as received from the drive 10. Consequently, the access is feasible with a short length of the stand-by turning time from the end of access of a first cylinder to the next adjacent cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a magnetic recording/reproducing device such as a hard disk device.

(Prior Art) Conventionally, for example, in a hard disk device, a magnetic recording medium (
A disk (hereinafter referred to as a disk) is composed of a plurality of tracks (cylinders), and is configured such that a magnetic head performs a seek operation for each track.

Each track is divided into information recording units called sectors, as shown in FIG. Dividing a track into a plurality of sectors 1 to n is usually called formatting.

Incidentally, a hard disk drive is provided with an index pulse generation circuit that generates one index pulse per rotation of the disk. The index pulse is used as a reference pulse during formatting, and is generated in synchronization with the start of the first sector 1 and the end of the last sector n of each track. The index pulse is generated at the same timing for each track at a constant angle with respect to the rotational position of the disk.

Here, it is assumed that data is accessed to adjacent tracks on the disk.

Normally, a hard disk drive is configured so that a plurality of magnetic heads perform seek operations on a plurality of disks, so data is accessed in units of cylinders. Suppose now that the magnetic head seeks to a predetermined cylinder i and data is accessed. Thereafter, when the magnetic head seeks to the next adjacent cylinder i+1, as shown in FIG. 8, a state occurs in which the rotation of the disk is specially photographed until the leading sector is detected. This is because the disk continues to rotate even while seek and data processing (processing such as data read and transfer) is being performed for the first cylinder i. Therefore, there is a drawback that the data access speed decreases by the amount of time the disk is waiting for rotation.

(Problems to be Solved by the Invention) In the conventional system, when data in an adjacent cylinder is accessed from a predetermined cylinder (track), there is a problem in that the access speed decreases due to the rotation of the disk.

An object of the present invention is to provide a magnetic recording and reproducing device that can shorten the waiting time for disk rotation and realize fast access to data when accessing data in an adjacent cylinder from a predetermined cylinder (track). It's about doing.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a format in which the positions of the leading sectors of adjacent even-numbered tracks and odd-numbered tracks of a magnetic recording medium are shifted from each other by a predetermined period. This is a magnetic recording/reproducing device equipped with a formatting means for performing formatting. Thereby, when accessing data in an adjacent track from a predetermined track, the disk rotation waiting time can be shortened by the predetermined period of the index pulse.

(Example) The present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing the basic configuration of the first embodiment. In FIG. 1, the magnetic recording/reproducing apparatus of the same embodiment includes a disk drive 10 and a disk controller 11. The disk controller 11 is a disk drive 10
and the host computer 12. The disk controller 11 has a function of formatting a disk driven by the disk drive 10. The disk drive 10 outputs an index pulse to the disk controller 11 every time the disk rotates once.

As shown in FIG. 2, the disk drive 10 includes an index output circuit for transferring index pulse 8 necessary for formatting or a new index pulse N shifted by, for example, 1/2 cycle from index pulse A to the disk controller 11. It is equipped with The index output circuit includes a counter 20, a pulse generation circuit 21, and a pulse selector 22. The counter 20 is a circuit that starts counting upon input of the index pulse A, and operates to output an output signal to the pulse generation circuit 21 after 1/2 cycle of the index pulse A.

At this time, the lock required for the counting operation of the counter 20 is, for example, a servo clock used in the servo circuit of the disk drive 10. The pulse generation circuit 21 is
A predetermined one pulse B is output in synchronization with the output signal of the counter 20. The pulse selector 22 outputs a cylinder even-odd signal C.
This is a selection circuit that outputs an index pulse A or one pulse B as a new index pulse N depending on the index pulse. The cylinder even-odd signal C is a signal that indicates whether the cylinder to be accessed is an even cylinder or an odd cylinder, and is output from the disk controller 11.

Next, the operation of the first embodiment will be explained. First, a plurality of disks to be formatted are rotated in the disk drive 10. At this time, the index generation circuit provided in the disk drive 10 outputs one index pulse A every time the disk rotates once.

The disk controller 11 starts formatting a plurality of cylinders of the disk rotating in the disk drive 10. That is, when executing the formatting process as shown in the flowchart of FIG. 3, the disk controller 11 sets an initial value "0" to the initial number of cylinders i, as shown in step 320 of FIG. Next, as shown in step 821, the magnetic head of the disk drive 10 is caused to seek to the cylinder 1.

Here, the disk controller 11 determines whether the sought cylinder i is an even cylinder or an odd cylinder. If it is an even number cylinder, the disk controller 11
outputs, for example, a cylinder even-odd signal C of logic "1" to the index output circuit of FIG. As a result, the pulse selector 22 selects, for example, the original index pulse A.
is selected and transferred to the disk controller 11. The disk controller 11 opens the write gate in response to the input of the index pulse A, and formats sector j (j-1), which is the first sector of cylinder 1 (steps 823 to 525). Initial fil settings for sector j are made in step 822. As a result, the first sector 1 of the even numbered cylinder is formatted as shown in FIG.

Similarly, the disk controller 11 controls the cylinder 1
A plurality of sectors 1 to n are sequentially formatted (steps 825 to $27). Here, in step 826, N
is the number of sectors set in advance. Then, when the index pulse A of the next cycle is input at the end of one revolution of the disk, the disk controller 11 closes the write gate and shifts to formatting for the next cylinder i (steps 328 to 531). This completes the formatting of all sectors 1 to n of the even numbered cylinders shown in FIG.

Next, if the cylinder 1 is an odd cylinder, the disk controller 11 outputs, for example, a cylinder even-odd signal C of logic "0" to the index output circuit shown in FIG. As a result, the pulse selector 22 selects the pulse generating circuit 21.
1 pulse B output from is selected and transferred to the disk controller 11 as a new index pulse N. The new index pulse N is a pulse shifted by, for example, 1/2 cycle from the index pulse A created based on the counting operation of the counter 20 as described above.

The disk controller 11 generates a new index pulse N
The write gate is opened in response to the input, and sector j, which is the first sector of cylinder i, is formatted (steps 323 to $25). As a result, as shown in FIG. 4, the leading sector 1 of the odd-numbered cylinder is formatted at a position shifted by 1/2 period from the index pulse A with respect to the leading sector 1 of the even-numbered cylinder. Thereafter, the disk controller 11 will format all sectors 1 to n in the odd-numbered cylinders in the same manner as in the even-numbered cylinders.

In this way, the disk controller 11 formats the disk so that one even-numbered cylinder and one odd-numbered cylinder are shifted by 1/2 cycle from each other, as shown in FIG. When data is accessed on a disk with such a format, it is assumed that the even cylinder 21 is first accessed as shown in FIG. After this, when the magnetic head seeks to the next adjacent odd-numbered cylinder 21+1, the first sector detected corresponds to the end position of the first accessed even-numbered cylinder, as shown in FIG. This is, for example, 172 cycles after the index pulse. For this reason,
When accessing the next adjacent odd-numbered cylinder 21+1, the disk rotation waiting time excluding the data processing (processing such as data read and transfer) for the first even-numbered cylinder and the seek time to the next odd-numbered cylinder is extremely short. Become. That is, compared to the conventional system as shown in FIG. 8, the waiting time for disk rotation can be significantly shortened when accessing the next adjacent cylinder after the first cylinder has been accessed.

In this embodiment, the adjacent even-numbered cylinders and odd-numbered cylinders may have formats shifted by 1/2 period from each other, and the format synchronized with the original index pulse A may be the odd-numbered cylinder. Furthermore, the mutual periodic shift is not limited to 1/2. Furthermore, although the index output circuit in FIG. 2 has been described as being provided in the disk drive 10, it may also be provided in the disk controller 11.

FIG. 6 is a flowchart relating to a second embodiment of the present invention. In the second embodiment, the disk controller 11
executes the formatting process as shown in the flowchart of FIG. 6 based on the index pulse A without using the index output circuit shown in FIG. First, the disk controller 11 sets the initial number i of cylinders to an initial value "0", as shown in step S1.

Next, as shown in step S2, the disk drive 1
0 magnetic head seeks to cylinder i.

Here, the disk controller 11 determines whether the sought cylinder i is an even cylinder or an odd cylinder (step 34). If it is an even numbered cylinder, the disk controller 11 opens the write gate in response to the input of index pulse A, and formats sector j (j=1), which is the first sector of cylinder i (steps 87 to 89).

The initial value of sector j is set in step S5.

As a result, the first sector 1 of the even numbered cylinder is formatted as shown in FIG.

Similarly, the disk controller 11 controls the cylinder i.
A plurality of sectors 1 to n are sequentially formatted (steps 810 to 514). Here, N in step S10
is the number of sectors set in advance. Then, when the index pulse A of the next cycle is input at the end of one rotation of the disk, the disk controller 11 closes the write gate and shifts to formatting for the next cylinder i (steps 815 to 818). This completes the formatting of all sectors 1 to n of the even numbered cylinders shown in FIG.

Next, if cylinder i is an odd-numbered cylinder, the disk controller 11 sets the physical position corresponding to the value of N/2 of the total number of sectors N in the even-numbered cylinder or a sector value close to it as the first sector. (Step S6
). That is, as shown in FIG. 4, with respect to the leading sector 1 of the even-numbered cylinder, the sector corresponding to the position shifted by 1/2 cycle from the index pulse A becomes the leading sector 1 of the odd-numbered cylinder.

Hereinafter, in the same manner as in the even-numbered cylinders, the disk controller 11 controls all sectors 1 in the odd-numbered cylinders.
~n formats will be executed. Therefore, similarly to the first embodiment described above, the even-numbered cylinders and the odd-numbered cylinders are 1/2 of each other with respect to the disk.
Formatting will be performed with a period shift. Therefore, similarly to the first embodiment, when accessing the next adjacent cylinder after the first cylinder has been accessed, it is possible to significantly shorten the disk rotation time. .

[Effects of the Invention] As described in detail above, according to the present invention, by formatting a disk with a predetermined period shift between adjacent cylinders (tracks), data from a predetermined cylinder to an adjacent cylinder is transferred. When accessing, the disk rotation time can be significantly reduced. Therefore, it is possible to realize high-speed data access to a disk in a hard disk device or the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of the first embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the index output circuit of the first embodiment, and FIG. 3 is a block diagram showing the configuration of the index output circuit of the first embodiment. 4 and 5 are timing charts for explaining the operation of the first embodiment, and FIG. 6 is a flowchart for explaining the operation of the second embodiment. The flowcharts in FIGS. 7 and 8 are timing charts for explaining operations in the conventional system, respectively. 10...Disk drive, 11...Disk controller, 12...Host computer, 20...
Counter, 21...Pulse generation circuit, 22...Pulse selector. Applicant's Representative Patent Attorney Takehiko Suzue Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) In a magnetic recording/reproducing device that accesses a magnetic recording medium having a plurality of tracks and each track being divided into a plurality of sectors, each rotation of the magnetic recording medium causes the adjacent magnetic recording medium to index pulse generating means for generating an index pulse that indicates the position of the leading sector of one of the even-numbered tracks or the odd-numbered track; timing pulse generating means for generating timing pulses with periods shifted from each other; and based on the index pulse or the timing pulse, positions of respective leading sectors in adjacent even-numbered tracks and odd-numbered tracks of the magnetic recording medium are mutually shifted at a predetermined period. 1. A magnetic recording and reproducing apparatus comprising: a formatting means for performing formatting in a shifted state; and an accessing means for accessing data on the magnetic recording medium formatted by the formatting means. (2) In a magnetic recording/reproducing device that accesses a magnetic recording medium having a plurality of tracks and each track being divided into a plurality of sectors, each track of the magnetic recording medium is rotated once the magnetic recording medium rotates. an index pulse generating means for generating an index pulse indicating the position of the first sector of the magnetic recording medium; Based on the index pulse, the first sector is sequentially formatted starting from the first sector synchronized with the index pulse, and the first sector of the other track is started from a position shifted by a predetermined period from the position of the first sector of the one track based on the index pulse. What is claimed is: 1. A magnetic recording and reproducing apparatus comprising: a format execution means for performing formatting; and an access execution means for accessing data on the magnetic recording medium formatted by the format execution means.