JPS58169309A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To detect exactly a write error, by comparing a detecting data outputted by a demodulating circuit, with the first recording data, and detecting the write error. CONSTITUTION:The first recording data (1) by an NRZ system is sent out from a host device 1 by being a controller, its data (1) is modulated to the second recording data (2) of an MFM system by a modulating circuit 3, and write is executed in accordance with its data (2). An error detecting circuit is constituted of a coincidence detecting circuit 8 which compares the data (1) with (2) and detects whether they coincide with each other or not, a timing clock generator 9 for detection, and an error detecting circuit which detects an output of the coincidence detecting circuit 8 by synchronizing with its clock (7), detects whether it is an error or not, and outputs a data (8) of its fact. In this way, a write error can be detected exactly.

Description

[Detailed description of the invention] (1) 518t) tjt*in! The device K is capable of detecting a malfunction in the magnetic link of a magnetic disk device and detecting l1ljl writing.
Related 0 @ 妓frO Background In the magnetic disk device, the higher-level device Sonesheets sends out iEm data using the N1jE method, and modulates the le life data to data such as the MF Rei method. Based on the data, a write current is applied to the head and written to the magnetic disc plate.◇ In recent years, the number of high-volume write currents has increased, resulting in malfunctions that cause modulation in the transmission system of 11 and 141 K. Conventional technology and problems In the past, as a check method such as Generally, after writing to the medium with the #i head, the *0 head is used to detect the read door. Due to the writing format, the track width became narrower (1K), making it impossible to install two heads on the Oka-Tochikku (1k), and the lead door 71-・2-item method due to overcurrent.
It's impossible to use Hiroshi.

(4) The purpose is to speed up the reliable detection of erroneous file writing in OI magnetic disk drives.

(5) FIO configuration The original disk device outputs data from the host device to the first O according to the modulation method for recording data.
A modulation circuit that modulates to 1ea data, a current increase @ circuit that inputs the armpit 30 notes data and outputs a write current, a magnetic head that sends the armpit write current to write to the recorder, and a wrinkled magnetic head. O playback data to 10th brass data 1
1 demodulation 111I, and detects the write current to the magnetic head (O off 1m) and detects the detection data output by the folding current detection circuit in response to the output of the write current to the magnetic head and the l1
It is assumed that the true value of 2) erroneous writing is detected by comparing 1.

(@Issue e + iosm example No. ill Tsumumotoya - 〇-P■, Ta-kaku, sa
Notes ■～・ on the base are shown in g.

In this embodiment, like the normal magnetic disk drive/1111 and 2, the host device 1, which is an N-type, sends the le-data Φ of ll1 by the N-wing 2 method, and the 0 data Φ
The current amplification circuit 4 is modulated by the Aiuuii path 3 into the MFM method's 8° recorded data, and based on the 7O data.
Writing to the disk is performed by flowing a write current Φ to the magnetic head 0 from 0 to 0. And in this embodiment, the current pattern flowing to the magnetic head during writing is generated by, for example) 7. K of the liveback voltage signal) is being detected. That's electric power, and it's the same as MFy method O relay 1O1e-data 0.
o Output data signal 0. The signal (1) is then input to a demodulation circuit 7 provided in advance for reading, and demodulated into NBZ system O data (2).

The WA detection circuit 1 in this embodiment includes a cycle detection circuit $ that compares data ■ and ■ and detects whether or not there is a cycle, and a generator 9 that generates a detection O voice signal. And soeta
In the evening, the Kfl1 period was detected, and the output of the output gate was detected.
Erroneous] It consists of an E2 #IL output path that detects whether or not it is a write and outputs data to that effect. , at that time, Day I is at H level1.
In this example, there is a read function that directly reads the contents written to the disk.
Unlike the array write method, it is necessary to monitor all systems from Konto 2 to the distal trench. (7) Detailed explanation of the invention and the fact that the present invention eliminates most of the errors caused by disc scissoring Detects, & knows 0

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the flow N of an embodiment of the present invention, and Fig. 8 is a skin diagram showing the signals Φ to ■ of the section in Fig. 1.

Claims (1)

[Claims] A circuit that modulates the recorded data of the 91111 transmitted from the host device into a j1110me silver data according to the recording modulation method, and the corresponding relay! A current amplification path that inputs data I and outputs a write current; a magnetic head that sends a write current to write on a recording medium; and a magnetic head that enriches the reproduced data into JIIID data. a voltage detection circuit for detecting the switching of the write current to the wrinkled magnetic head; and a detection gator for detecting whether the scissors demodulation path is output in accordance with the output of the current detection circuit. A magnetic disk i device characterized in that it is equipped with an an detecting device that compares the data with the data I and outputs one write.