The hard drive technique zong is horizontal to talk- foreword

Progress along with science and technology, the computer development is more and more quick, several decades come to the hard drive conduct and actions to save the main force power of lie the quality, still measure regardless and calmly the functions all turn over the variety of Reply ground an an an an an an an an an an an a day, but now it is necessary saving in the personal computer the position of the equipments still is to can't falter, in any personal computer system, the hard drives are all one of the most important partseses.Currently it is also the main place of the saving data of customer, peacetime the operate system, the application software, game and other important datas etc.s that we use are saving all in the hard drive.

Along with computer other accessorieses change with each passing day, the new technique appear in the hard drive is also more and more, lookinging at the hard up for cash hard drive of oneself, you understand to it exactly how much?Especially to the hard drive of now the adoptive new technique have how much understanding?These new techniques take the advantage of those aspects to the end customer, customer at applied these combine to have the new technical hard drive again should notice those problems?In this 《 the hard drive technique zong horizontally talk 》 special subject, the writer compromises this to carry on the thorough study.

Total to say, the new technique of the hard drive usage includes the hard drive head technique, diskette technique, connects a people's technique, the data protection technique and vibrates to protect system and each kind of examination technique etc.s nowadays.In these new techniques, don't lack to have some techniques are excellent to turn the new version technique that the renewal release on the original and technical foundation, for example Data Lifeguard( Enhanced), ShockBlock( Enhanced), SeaShield( Enhanced)...etc..Certainly, also have some new techniques to create completely and lately of, for example the AFC diskette technique that company of IBM release and just walked up our Serial ATA( the string went the ATA) to connect a people's technique.

The hard drive head technique, the elfevident, is a new technique that contends for reading and write the head to the hard drive, the most obvious 1:00 in better head is to have to read and write the intelligent degree higherly, so can promote a capacity of the hard drive significantly, a capacity went up, the total capacity nature of the hard drive there will be the exaltation.This in now data information ages of nasty play inflation, the request of customer to the hard drive capacity is certainly more big more good.The hard drive diskette technique, is also the hard drive disk slice use of new technique, the most direct advantage in the better hard drive diskette technique is also a capacity of the hard drive and can do larger, it is complement each other with the hard drive head technique.

And protect to the hard drive data protection technique and vibration the system is all the assistance technique that is the hard drive, although these techniques can't bring about direct influence on the hard drive capacity or function, they also are necessary, imagine once, be the hard drive data to deliver the rate to do more and more high, depend what guarantee the data does not take place the mistake or throw to lose in high speed deliver process?Or the hard drive is in severely vibrate, again how guarantee the safety and credibilities of the customer data?These are all the hard drive data protection technique and vibrations to protect the system to should do of.The hard drive lost the protection technique of these assistances is not imaginable.

Everything starts from" head"- huge head of zizu of GMR

Positive such as of headline explain of, the hard drive head to the hard drive is to go to the pass important, currently the hard drive on the market almost at use the head of GMR, but early time, the hard drive head contain thin film respond( FEI) the head, each to the opposite sex zizu ( AMR) head and the MR zizu head.In addition, in addition to above introductive these four kinds of heads, we still come in sight of concerning CPP- GMR and the related data of the head of OAW, however did not hear use the technical and related product of these heads appear, possibility these are all each factory's technique storages, be also likely to be some not mature over old technique.

GMR(Giant MagnetoResistive)

The saving industry hasn't been stop a ground of quest how raise to face the density and lower the price of the each trillion word stanza, its result is to face the density to raise 50% annually or so.In this long journey, recent inventive new technique?D?The D huge zizu ( GMR) head tree has the imposing milestone.For example apply to make face the density in the head of GMR of the rare jie company Barracuda ATA hard drive over the 15 Gbits/ square inch, read now/ write the head technique to attain of face more than 300% of record the density.The fact prove that the GMR spreads the feeling machine is up to the present read from the hard drive the most intelligent component of data.

Face the density the number that is the each inch zi way is multiplies the number of zi of the each inch.Face the density for the sake of the exaltation, in in the past 10 years, the head technique experienced 3 important development stages.They is:

<> The thin film respond( FEI) the head
<> Each to the opposite sex zizu ( AMR) head
<> GMR

At 1990 goes to 1995, hard drive adoption the TFI read/ write the technique.The head of TFI is the zixin that rounds the line actually.Disk at round the zixin of the line under pass would on the head the creation responds the electric voltage.The TFI the reason that read the head will attain its ability extreme limit, is because at the time of raising the intelligent degree of zi , it writes the ability but dies down.

90's middle, hoped the company of jie to release the hard drive of the usage AMR head.The AMR head usage TFI head to complete to write the operation, but be to read the component with the magnetism material of the thin.Under the condition of having the magnetic field, the electric resistance of the thin will change with the magnetic field, then producing the very strong signal.The hard drive translates the solution because the magnetic field pole change but an electric resistance change, raising to read the intelligent degree.The head of AMR further raises to face the density, and reduced a machine number of items quantity.The electric resistance amount of variety of the thin film of AMR contain certain limit, so the intelligent degree of the head of AMR also exists the extreme limit.This causes head of GMR develop, but the head of GMR is a company of IBM in the head of MR technical foundation up the renewal release of.

The head of GMR inheritted the head of TFI and head of AMRs in the read of adoption/ write the technique.But it reads that the head's magnetism variety toward disk expresses a higher and intelligent degree.The GMR spreads the intelligent degree of the feeling machine bigger than head of AMR 300%, so can raise the hard drive to face the density and functions.The GMR head work principle is depend on in from xin of electronics spread to shoot.For the sake of the work process of the elucidation GMR head, led to go into from this technical term of valve of xin ( SV).Underneath,such as table,1 show is a GMR to read the head thin film structure.

This kind of structure makes the variety change of the magnetize angle( from xin ) of the free layer become the variety and the electric voltage output's varieties of the electric resistance value, so call it as from the valve of xin .For the sake of the stable work of credibility, the thick and thin layer( the hair silk diameter for 100,000 rices of na) of these 1.5 rices of na must have the very high crystal quantity and very few physicses and the magnetism blemishs, otherwise the unbearable harsh hard drive work temperature condition.

CPP- GMR and head of OAW

CPP-GMR

Head of CPP- GMR, all of Chineses call the large anti- magnetize head of the namely perpendicular flat surface electric current mode, its that day was originally the Fuji a company of the calculator manufactory to develop a kind of new read and write the disk head technique.The record density that uses the hard drive actuator of this technique can be up to the each square inch 300 GBs.The hard drive records the saving capacity that the increment of the density will raise the notebook and the desktop computer, but the price is just to have the rising slightly.

A company of Fuji mean that a saving capacity of each disk of 2.5 inches of hard drives is the 30 GBs currently, if this new disk technique carries out in from 2 years to 4 years commercial, will make the saving capacity of each disk slice raise the 180 GBs so, is a capacity of each disk currently of 300%.Compared with the existing head of GMR, the new disk head of this breakthrough is also a sensitive to the signal, and read and write the tightly packed degree of the data is the triple of the existing head of GMR.A company of Fuji anticipate within two years realization commercial produce according to the actuator of this kind of head of CPP- GMR, mainly used for in the PC and notebooks, particularly is used for the expectation market prosperous according to actuator of in the consumption electronics product, if the game controls pedestal and personal video frequency video recorder etc.s.

According to a company of Fuji introduction,2.5 inches of hard drive actuators of the high capacity are end and will replace bulky 3.5 inch hard drive actuatorses.According to the covariance of the international disk actuator equipments manufactory association( IDEMA), in pass by of more than ten years, the disk is saved the exaltation of the capacity and even wanted to be quick in the exaltation that the data handles the ability, but an own expertise of the manufactory detection converts into the actual benefits.The saving price of hard drive has already declined for one beautiful cent of the current and each trillion word stanza from the each trillion word stanza USD 11.54 of 1988, and the independent hard drive manufactory quantity also from originally of 75 decrease arrive current 13s.

OAW

It is English Optically Assisted Winchester that all of Englishs of OAW call, namely optics assistance WEN ZHI 's technique.That technique is a kind of new head technique that the Seagate is develop, it reads and write the head to the traditional zi to combine with the low strength laser beam together, the laser beam enters the head through a fiber optic, the mirror that drives through one more tiny electrical engineering reflects the disk surface, thus carrying out accurate fixed position of the head.The rare company of jie thinks that the technique of OAW can write in 105000 zi s way within the scope of an inch of breadth of, a capacity of hard drive can amount to the 36 GBs above, but that technique wants to enter the practical stage to still need time for 23 years.However, a capacity of the hard drive has already come to a the 80 GBs now, so see, this technical market foreground of OAW allows of no the optimism.

In fine, the head technique and a capacity of hard drives are vitally related, onlying have the more advanced head technique, just may have the more impressionable head parts, thus make the hard drive of the higher capacity publish.