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Electrical current measurements at head-disk interface

A current measuring device and current technology, applied in the protection measures of the magnetic head, aligning the magnetic tracks on the magnetic disk, recording information on the magnetic disk, etc., can solve the problems of interference measurement accuracy and so on

Inactive Publication Date: 2007-04-11
SAE MAGNETICS (HK) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for acoustic emissions, as mentioned above, air bearing resonances can interfere with measurement accuracy

Method used

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  • Electrical current measurements at head-disk interface
  • Electrical current measurements at head-disk interface
  • Electrical current measurements at head-disk interface

Examples

Experimental program
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Embodiment Construction

[0025]Referring to Figure 3, an apparatus for measuring current at the head-disk interface is shown. Like a conventional disk drive, a magnetic recording medium (such as a magnetic recording disk 303 ) rotating around a rotating shaft 301 is provided. In this example, the disk 303 is clamped to the shaft 301 and electrically grounded. A head, such as magnetic recording head 305, is provided with an air bearing surface to allow it to float over the moving disk surface. A current measuring device is provided, such as a picoammeter (eg, model 6487 picoammeter / voltage source manufactured by Keithley Instruments, Cleveland, Ohio).

[0026] In a first embodiment of the present invention, the head gimbal assembly (HGA, including the head 305 and its supporting flexures) is electrically isolated from ground. The ammeter 309 is connected to a contact 313 which is electrically connected to the magnetic recording head on the suspension 307 . As seen in Figure 3, if the HGA is electric...

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Abstract

According to an embodiment of the present invention, head / disk contact events are determined through a measurement of current at the head disk interface. For example, an ammeter / voltage source component may be electrically coupled to a magnetic / slider of a disk drive as well as to a spindle coupled to the recording medium. Applied voltage to the slider may result in a lower flying height. Greater measured current by the ammeter could indicate head / disk contact and assist in adjusting applied voltage to obtain a desire flying height.

Description

technical field [0001] The present invention relates to methods and devices for measuring current on hard disk drives and the like. More specifically, the invention relates to measuring current flow between a magnetic recording head and a recording medium. Background technique [0002] A hard disk drive is a general-purpose information storage device that basically consists of a series of rotatable platters that are accessed by magnetic read-write elements. These data transfer elements, commonly referred to as transducers, are usually carried by and embedded in a slider body that is held in close proximity over discrete data tracks formed on the disk so that Allow read / write operations can be implemented. To properly position the transducer relative to the disk surface, an air bearing surface (ABS) formed on the slider body is subjected to a flowing air flow that provides sufficient lift to keep the slider and transducer on the disk data track "float". The high speed rot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/02G11B5/58G11B5/596G11B17/00G11B5/012G11B33/14G11B5/40
CPCG11B5/40G11B5/02
Inventor X·张Z·冯E·T·查Y·付
Owner SAE MAGNETICS (HK) LTD
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