Users may turn on and off the green laser pointer at any time with the ON/OFF keystroke on body

The principle of magnetic recording media and head has a gap in a annular magnetizer Shangrao coil, in a seamless annular magnetizer Shangrao coil, constitutes the head. heads are usually made of soft magnetic materials. constitute the head. heads are usually made of soft magnetic materials. Computer Science head the form can be divided into two heads in the form of the contact head and the floating head can be divided into two contact-type head-contact head of the contact head and the floating head in the read and write information, contact the head to read and write information, magnetic heads and recording media quality direct contact direct contact with the floating head is the air flow generated by the media, high-speed movement, generated when the air flow between the head and media surface to form a very thin layer of air film (air cushion),), so that heads and media layer of very thin film of air (air), so that the surface of the head and media disengagement and floating surface disengagement and floating 17 computer component principle 8.2.2 The power switch is on one side of the green laser pointer body.The magnetic recording medium the head 3.MR head (self) MR head (self-) head of Computer Science magnetoresistance effect (magneto reistive, referred to as MR) using the magnetoresistance effect referred to as MR) head (magneto reistive, in the case of high-density recording read out the signal head of the MR head in read out the signal density record. the MR head is dedicated to the read head is dedicated to the read head. The simple ON/OFF keystroke brings green laser pointer users portability.the head coil, if there is no forward current shall be the direction of current no current is not zero there must be the direction of current, no current state system. magnetosphere is not positive saturation magnetization and is the reverse saturation magnetic sequential write 'or of consecutive Write '1 'or '0', the direction of the write current is time-invariant, therefore, the same, so this record than zero the system reduces the number of magnetization reversal of the number of flip 23 Principles of Computer Organization 8.2.3 Magnetic Recording way to turn the non-return to zero See "1" to turn non-return to zero (NRZ1) on the turn of the non-return-to-zero system NRZ1) School of Computer Science and of no return zero system, recording information, and do not return to zero, record information, there is always a current through the head coil.