Sae Magnetics (h.k.) Limited

Shengqiang Chen

Wahchun Chan

Tszlok Cheng

Yi Wan

XueYang Wang

Shuo Chen

ShuGuang Li

Feng Chen

JianWei Zhu

DongQiang Xie

KwokChiu Cheung

ChangLong Deng

A method for measuring noise of a magnetic head includes setting a plurality of threshold values, applying bias current or voltage to a read element of the magnetic head, applying an external transverse magnetic field to the magnetic head, amplifying output signal from the read element to produce an amplified signal, filtering the amplified signal to produce a filtered signal, generating an enable signal for each threshold value in a predetermined time window by a counting control means with input signals which include the filtered signal and the threshold value, measuring the cumulative time duration of each enable signal, making an amplitude-duration distribution according to the cumulative time durations and the threshold values, calculating a plurality of parameters according to the amplitude-duration distribution and analyzing the parameters with a plurality of predetermined criteria to determine the defects of the magnetic head. Accordingly, the invention also discloses a system for measuring noise of a magnetic head.

Method and system for measuring noise of a magnetic head

An intelligent locking device comprises a microprocessor, a locking element and a control button electrically connected to the microprocessor respectively. The locking element locks a removable HDD to a computer. The control button generates trigger signals in response to manual push thereon. When receiving the trigger signal, the microprocessor detects whether there is data transferring between the removable HDD and the computer, if there is data transferring, the microprocessor terminates data transferring and then sends a driving signal to the locking element; if not, the microprocessor directly sends a driving signal to the locking element. When receiving the driving signal, the locking element releases the lock between the removable HDD and the computer to permit the removable HDD to be safely ejected. Meanwhile, a removable HDD receiving system with the locking device and a method for preventing the removable HDD from being wrongly ejected from the receiving system are disclosed.

Intelligent locking device, removable HDD receiving system with the same and method for preventing the removable HDD from being wrongly ejected therefrom

Growing community of inventors

Dongguan, China

Shengqiang Chen