JPH02230569A - Method and mechanism for controlling sweep seek of magnetic disk device - Google Patents

Abstract

PURPOSE:To perform sweep seek at high speed and in a short time by performing movement to an inner guard band and an outer guard band by direct seek used on an ordinary data plane. CONSTITUTION:When no microprocessor control circuit group 10 is selected by a host device, the sweep seek to return a head to an original cylinder is performed after the head is sought periodically from the inner guard band to the outer guard band. To perform the above operation, a counter 112 to decide the start of the operation, a judging part 111 to decide the sweep seek based on the states of a counter set signal and an interface signal, a register 107 in which a guard band cylinder is stored, a buffer 102 to hold a called guard band cylinder, and a selector 103 to select the cylinder of ordinary seek or a sweep cylinder are provided. Also, positioning for constant time on the guard band cylinder can be realized by providing a timer 110. In such a way, the sweep seek can be performed in a short time and also, at high speed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic disk device, and in particular to sweep seek control for a magnetic disk device that periodically sweeps the entire area of a data cylinder in addition to a normal seek operation. Concerning methods and mechanisms.

[Conventional technology]

Conventionally, as a head drive control circuit for a swing seek in this type of magnetic disk device, a circuit has been used that combines a control circuit for evacuating the head ζ from the data area in the event of a seek error and a reinitialization control operation circuit.

[Problem to be solved by the invention]

In the above-mentioned conventional magnetic disk head mounting, the speed in sweep seek is set to a low speed, so the seek time becomes longer than in the normal case, and the sweep seek operation period ends up becoming longer, which poses a problem in terms of optimality. There is. Furthermore, there is a possibility that data access from the host device will be hindered.

[Means to solve the problem]

The magnetic disk device of the present invention includes a head disk assembly, a servo analog circuit, a servo logic circuit, a cylinder address circuit, and a microprocessor/control sequence memory/periphery having firmware for seeking to a target shilling according to a command from a host device. L.S.
When the microprocessor control circuit group (system) is not selected by the host device, the head is periodically moved from the inner guard band (IGB) to the outer guard. A counter that determines the start of the sweep seek after seeking to the band (OGB) cylinder and returning to the original cylinder; a determination unit that determines the sweep seek from the counter set 1 signal and the interface signal state; A register in which a band (GB) cylinder is stored, a buffer that holds a called guard band (GB) cylinder,
It has firmware realized by a selector that selects between a normal seek cylinder and a sweep cylinder, and a timer that positions the cylinder on the guard band (GB) cylinder for a certain period of time.

〔Example〕

5-1 Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram of a microprocessor control circuit (system) 10 of the present invention, which is composed of four microphones, a controller, a roll sequence memory, and a peripheral LS circuit. 100 is a sequence memory in which at least a positioning control operation sequence is stored. Reference numeral 101 denotes a control 1 roll sequence, which sequentially executes instructions read out from the sequence memory 100. 102 is the current cylinder buffer, I/O PORT PB12
The cylinder address sent from the address bus 1 is received via the address bus 1. A cylinder selector 103 selects the current cylinder buffer 102 or the sweep seek address buffer 108 depending on the state of the sweep execution signal f, and sends the selection to the seek parameter table 104.

The seek parameter table 104 sets parameters necessary for seeking based on the sent cylinder address. 105 is a seek parameter buffer,
The calculated parameters are stored at 116= hours. 106 is a control buffer, ■/○
It is connected to the control bus J and status bus q via the PORT PD 14, and sends seek parameter/re-initialization (RTZ) control signals to the servo logic circuit, while transmitting speed signal information/G. B. Receive signal information.

107 is a cylinder register, and when a sweep seek operation is started, the cylinder contained in the current cylinder buffer 102 is sent to this register. A sweep address buffer 108 holds the contents read from the sweep shilling register 109.

The sweep cylinder register 109 receives the G. B. Based on signal information, IG
The B cylinder or OGB cylinder is sent to the sweep address buffer 108.

Reference numeral 110 indicates G.110 during the sweep seek operation. B. 111 is a timer for positioning the cylinder for a certain period of time, and 111 is a sweep seek determination unit and a sweep seek counter that determines execution of a sweep seek based on the sweep prohibition signal e sent from the sweep cycle force counter 112 and the sweep prohibition circuit. 112 is a control sequence 101
The value set by is periodically subtracted, and the value becomes 0, which is notified to the sweep seek judgment unit as a state in which the sweep seek can be executed.

A command buffer 113 receives a sequence necessary for driving the spindle motor 45 and VCM 44 from the controller 1/roll sequence 101. Reference numeral 114 denotes a stay buffer, which receives G.1 from the control buffer 106.
B. Based on the signal and speed signal information, G. B. Cylinder selection・G. B. Controls the trajectory of the cylinder fixed time positioning timer.

FIG. 2 is a block diagram of an embodiment of the magnetic disk device of the present invention.

The disk medium 4l is fixed on the same rotation axis and on the same circular center, and the head 42 is arranged on each recording surface of the disk medium 41 and fixed to a positioner 43.

The positioner 43 includes a VCM 44 and receives a positioning drive current n from the servo analog circuit 30. Further, the positioner 43 includes a servo signal detection circuit, and sends a servo signal p including position information to the servo analog 30. In the servo analog circuit 30, G. E. Send the signal p and the cylinder pulse signal m to the servo logic circuit 20,
A positioning control signal k is received from the servo logic circuit 20.

The servo logic circuit 20 is connected to the microprocessor control circuit group 10 via the I/O PORT PD14 via a control bus j and a status bus q. In the microprocessor control circuit group 10, the I/O PORT
Receive the power-on (POWER, -ON) signal a and reinitialization signal (RTZ) I) via the PC 13, and
The address bus is received from the cylinder address register 50 via the PORT PB12. Further I/○
Sweep seek prohibition circuit 60 via PORTPAIL
connected to. The cylinder address register 50 sends the cylinder address h received from the host device along with the direct seek signal g onto the address bus i.

19. The sweep prohibition circuit 60 reports the presence or absence of a sweep seek to the host device via the drive status signal d. When the unit select signal C is received and the device is selected, a sweep inhibit signal is sent to the microprocessor control circuit group 1o to inhibit sweep seek.

Next, the head positioning control flow including the sweep sequence according to the present invention will be explained with reference to FIGS. 3(a), 3(b), and 4.

FIG. 4 is a time chart showing the trajectory of the head 2 in the sweep operation of this embodiment, with time on the vertical axis and position on the horizontal axis. Here, assume that the cylinder number is M-2
We will discuss the case of performing a sweep seek when there is a head in . In particular, in the tree embodiment, OGB is located at cylinder number 1s3o4, and IGB is located at cylinder number M+83.
Let us consider the position as 0 3.

First, when it is detected that power is supplied by a power-on signal, a power-on initialization operation 300 is executed, and if normal, a spindle motor sequence 310 is executed.

Next, a normal recalibrate seek operation 320 is performed to position the head 42 to the home cylinder address, that is, cylinder 0 (2 0 1).

When the recalibrate seek is completed, the process advances to the "ready state" 330. In this state, first, the presence or absence of a direct seek command from the external interface is determined by the control tag signal g (340)'L, otherwise (3
1 4) Jump to decision branch 360; if yes, proceed to seek operation execution routine 350; The seek control in 350 is equivalent to the sequence in a conventional disk device, and performs a seek operation within the data cylinder area.

Next, in decision branch 360, the presence or absence of reinitialization (RTZ) control signal b is checked, and if there is, (361) the process moves to normal repeat rate seek control and executes the control described above. If not (3 6 2), the process proceeds to the sweep seek routine (4 0 0) of the present invention. At decision branch 410, the presence or absence of the sweep prohibition signal e is checked, and if there is, the process returns to the ready state repeat check loop (4 0 1), and if not, the process proceeds to 420.

In 420, the contents of the sweep seek force counter 112 are checked, and if it is 0, the sweep seek execution routine 4 is executed.
Proceed to 40. Otherwise, the counter value of the sweep seek force counter 112 is subtracted and a repeat check loop (4 0 1) is executed. In the sweep seek execution routine 440, first, a sweep execution signal is sent to the sweep prohibition circuit 60 with the sweep parameter set 441, and the data selector in the micropfusers circuit is
Controls changes in seek parameter settings, preparation for timer activation, etc.

The current cylinder 1 0 2 [M-2] (3 0 2) is saved to the cylinder register 107 at the save cylinder address 442. 443, the IGB cylinder [M+S] (3 0 3) stored in the sweep cylinder register 109 is set in the sweep address buffer 108 and passed through the cylinder selector 103 to the seek parameter table 10.
4 and is set in the seek parameter buffer 105. 444 IGB cylinder seek enters the control buffer 106 and performs the same control as a normal seek.

445's 20ms wait positioning, timer 11 is activated based on the positioning completion information stored in the state buffer.
Start 0. When the ○GB cylinder address read in 446 selects the ○GB cylinder [-S] (3 0 4) and the prepared seek parameter is stored in the seek parameter buffer 105, the timer 100 is set, the OGBO cylinder seek in 447 is performed. Execute.

When positioning is completed, the timer 110 starts again (4
4 8) When set, executes recalibrate seek to 449 O cylinder. Here, the cylinder address [M-2] (3 0 2
), this preprocessing is used to return to O
Position to the cylinder. After positioning, 44A
Return force of cylinder L cylinder with sill register 10
7 is returned to the current cylinder buffer 102 and a seek is performed.

When the seeker is completed, the process moves to the normal seek parameter set 44B, and the data selector, parameters, etc. are returned to the normal seek settings. Finally, the reset sweep cycle counter 450 sets the sweep cycle value in the counter 112, and returns to the ready state repeat check loop (4 0 1).

〔Effect of the invention〕

As explained above, the present invention has the effect of allowing direct seek operation to the IGB and OGB cylinders only when the sweep seek prohibition is lifted, thereby making it possible to perform the sweep seek of the entire area of the data cylinder in a short period of time and at high speed. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a microprocessor control circuit (system) of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3(a) is a flowchart of the sequential memory 100 of FIG. Figure 3(b) shows the third
A detailed flowchart of the sweep execution 440 in FIG.
FIG. 4 is an explanatory diagram showing the operation of the head 42 during a sweep seek. 100... Sequence memory, 101...
... Control sequence, 102 ... Current cylinder buffer, 103 ... Cylinder selector, 104 ... Seek parameter table, 105 ... Seek parameter buffer, 10
6...Control buffer, 107...
... Cylinder register, 108 ... Sweep address buffer, 109 ... Sweep cylinder register, 110 ... Timer, 111 ...
...Sweep seek determination unit, 112...Sweep seek counter, 1l3...Command buffer, 114...Status buffer, 10...
...Microprocessor control circuit, 20...
・Servo logic circuit, 30... Servo analog circuit, 40... Head disk assembly, 50... Cylinder address register, 60...
...Sweep prohibition circuit, 41...Disk medium, 42...Head, 43...Positioner, 44...V
CM, 45 Old...Spindle motor a...Para-on signal, b...Re-initialization signal, C...Unit select signal, d...Drive status signal , e...Sweep prohibition signal, f...Sweep execution signal, g...
...Direct seek signal, h...Cylinder address signal, i, old address bus, j...
・Control bus, k...Positioning control signal, ρ...
...Cart hand signal, m...Cylinder pulse signal, n...Positioning drive current, p...
...Servo signal, q...Status bus. Agent Patent Attorney Susumo Uchihara

Claims (3)

[Claims] (1) In a magnetic disk device that uses a magnetic disk having a data area, an outer guard pad on the outer periphery of the data area, and an inner guard pad on the inner periphery of the data area, and uses a head to record and reproduce information, the head is periodically In the sweep seek control method of moving from a position to the inner guard pad and the outer guard pad and returning to the original position, the movement to the inner guard band and the movement to the outer guard band are used on a normal data surface. Sweep seek control method characterized by performing direct seek (2) The sweep seek control method according to claim (1), characterized in that the sweep seek consists of the following processes: (a) a process of holding the current cylinder address of the head; (b) directing to the inner guard band; (c) A process of stopping within the inner guard pad for a fixed period of time; (d) A process of direct seeking from the inner guard pad to the outer guard band; (e) A process of seeking 0 cylinder from the outer guard pad by recalibrating seek. (f) A process that directly seeks to the cylinder address held in (b) above. (3) A magnetic disk device that uses a magnetic disk having a data area, an outer guard pad on the outer periphery of the data area, and an inner guard pad on the inner periphery, and records and reproduces information using a head, particularly in the sweep seek control mechanism of the head. , direct seek means for directly seeking to the address when a cylinder address is input; guard pad address storage means for storing cylinder addresses corresponding to the inner guard pad and the outer guard pad, respectively; and execution of sweep seek. and a sweep seek determination means for determining, and according to the determination of the sweep seek determination means, a sweep seek is performed by reading an address from the guard pad address storage means and inputting it to the direct seek means. Sweep seek control mechanism.