TESTING APPARATUS FOR CONDUCTING A TEST ON A MAGNETIC RECORDING MEDIUM OR A MAGNETIC HEAD, THROUGH RECORDING TEST DATA ON THE MAGNETIC RECORDING MEDIUM AND REPRODUCING RECORDED TEST DATA THEREFROM BY MEANS OF THE MAGNETIC HEAD

• US 6,894,489 B2
• Filed: 12/16/2003
• Issued: 05/17/2005
• Est. Priority Date: 12/22/1999
• Status: Expired due to Fees

• Current Assignee: Hitachi High-Tech Electronics Engineering Co., Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi High-Tech Electronics Engineering Co., Ltd. (Hitachi, Ltd.), Hitachi, Ltd.
• Inventors: Chujo, Norio, Hayashi, Yoshihiko, Homma, Shinji, Orihashi, Ritsurou, Takahashi, Masayoshi, Makuuchi, Masami
• Primary Examiner(s): PATIDAR, JAY M
• Application Number:
  US10/735,909
• Publication Number:
  US 20040124832A1
• Time in Patent Office: 518 Days
• Field of Search: 324/210, 324/211, 324/212, 360/31, 360/53, 360/313, 369/53.35, 369/53.17, 369/53.24, 369/69, 369/53.44, 714/719
• US Class Current: 324/212
• CPC Class Codes: G01R 33/1207 Testing individual magnetic storage devices, e.g. records carriers or digital storage elements functional testing G06F11/00, G06F11/28
• CPC Class Codes: G11B 20/10009 Improvement or modification of read or write signals
• CPC Class Codes: G11B 2005/001 Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers
• CPC Class Codes: G11B 27/36 Monitoring, i.e. supervising the progress of recording or reproducing for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06
• CPC Class Codes: G11B 5/00 Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor G11B11/00 and G11B13/00 take precedence
• CPC Class Codes: G11B 5/012 Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence
• CPC Class Codes: G11B 5/455 Arrangements for functional testing of heads; Measuring arrangements for heads

Abstract

A testing apparatus of a magnetic recording medium for conducting a test on the magnetic recording medium by using reproduced data obtained through reproduction of the magnetic medium, including a plurality of conversion means for converting the reproduced data into digital data, holding means for holding the digital data converted by the plurality of conversion means, data processing means for performing a calculation process on the digital data held by the holding means in relation to a magnetic characteristic of the magnetic recording medium, and analysis processing means for performing an analysis to determine whether or not information obtained by the data processing means satisfies a certain condition.

Claims

1. A testing apparatus of a magnetic recording medium for conducting test on said magnetic recording medium through recording testing data onto said magnetic recording medium by means of a magnetic head and reproducing recorded testing data by means of said magnetic head, so as to perform a predetermined process on reproduced testing data, comprising:

plural conversion means for converting the reproduced testing data into digital values;

sampling clock control means for operating said plural conversion means, at a predetermined sampling frequency for each one of said plural converter means;

plural holding means for holding the digital values converted by said plural converter means; and

data processing means for conducting a calculation process in relation to a magnetic characteristic of said magnetic recording medium from digital values held by said plural holding means, thereby conducting the test on said magnetic recording medium.

2. A testing apparatus as claimed in claim 1, wherein said calculation process is a statistic calculation process or a frequency analysis calculation process, in which a peak value of said reproduced testing data or a threshold value time when exceeding or being below an arbitrary threshold value is measured with using the digital values, thereby to calculate an average value or a dispersion value or a deviation value or a cumulative frequency with respect to said peak value or said threshold value time.

3. A testing apparatus of a magnetic head for conducting test on said magnetic head through recording testing data onto a magnetic recording medium by means of said magnetic head and reproducing recorded testing data by means of said magnetic head, so as to perform a predetermined process on reproduced testing data, comprising:

plural conversion means for converting the reproduced testing data into digital values;

sampling clock control means for operating said plural conversion means, at a predetermined sampling frequency for each one of said plural converter means;

plural holding means for holding the digital values converted by said plural converter means; and

data processing means for conducting a calculation process in relation to a magnetic characteristic of said magnetic recording medium from digital values held by said plural holding means, thereby conducting the test of said magnetic head.

4. A testing apparatus as claimed in claim 3, wherein said calculation process is a statistic calculation process or a frequency analysis calculation process, in which a peak value of said reproduced testing data or a threshold value time when exceeding or being below an arbitrary threshold value is measured with using the digital values, thereby to calculate an average value or a dispersion value or a deviation value or a cumulative frequency value with respect to said peak value or said threshold value time.