CN100407155C - Protector and protecting method for portable computer hard disc driver - Google Patents
Protector and protecting method for portable computer hard disc driver Download PDFInfo
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- CN100407155C CN100407155C CN021344957A CN02134495A CN100407155C CN 100407155 C CN100407155 C CN 100407155C CN 021344957 A CN021344957 A CN 021344957A CN 02134495 A CN02134495 A CN 02134495A CN 100407155 C CN100407155 C CN 100407155C
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- microprocessor
- magnetic head
- portable computer
- hard disc
- computer hard
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Abstract
The present invention relates to a protective device and a method for a hard disk driver of a portable computer. The protective device comprises an acceleration sensor, a microprocessor and a magnetic moving device. The method comprises the steps that the acceleration sensor detects whether the computer lies in a free falling body motion state, if true, a signal is sent to the microprocessor; when the microprocessor detects the state for a scheduled time, the microprocessor orders the magnetic head moving device to retract a magnetic head from the surface of a magnetic disk so that the damage of a hard disk due to the impact of the magnetic head can be avoided.
Description
[technical field]
The invention relates to a kind of protective device and method of portable computer hard disc driver, the protection scheme of when particularly falling hard disk drive head being stopped about a kind of portable computer.
[background technology]
Present various types of portable computer all has a miniature hard disk drive, and this hard disk drive may be shaken, in some cases may badly damaged hard disk drive.
Because under the situation of operate as normal, the magnetic head and the distance between disc sheet of driver are very little, magnetic head touches disk easily when computing machine is given a shock, thereby magnetic head is sustained damage, can scratch disk when serious, destroy the data that write down in the magnetic medium, this phenomenon is known as " head crash ", and it may cause irremediable corrupted data.
Therefore, how effectively to prevent contacting between magnetic head and disk to become an important problem.
Existing most typical hard disk protecting method is to rely on vibrations the reaction that the back portable computer is made takes place; as United States Patent (USP) the 5th; 235; No. 472 and the 4th; 862; No. 298, these methods all depend on and magnetic head are rested in the landzone of no datat or magnetic head is unloaded from magnetic disk surface.Another preferably method be before hard disk is clashed into, take preventive measures with the protection hard disc data, as United States Patent (USP) the 5th, 227, No. 929, its protection system comprises one or three accelerators and a special microprocessor.This microprocessor is carried out a program to keep the communication with hard disk drive, and order hard disc magnetic head to be withdrawn successively, but relatively long time of this continuous action need cost, because its operation is consuming time too much, magnetic head may strike magnetic disk surface before withdrawal.In addition, this project organization complexity, system overhead is big, and it depends on the operation of microprocessor and the timely response of hard disk drive can prevent that just disk is not destroyed.
The method that another more effective prevention hard disk is clashed into is to implant a control microprocessor in that hard disk drive is inner, thereby can avoid the uncertain time delay that causes because of host computer system or software.
[summary of the invention]
The object of the present invention is to provide a kind of protective device of portable computer hard disc driver, avoid damaging hard disk, and then reach the purpose of data protection because of the bump of magnetic head.
The objective of the invention is to realize: the protective device of portable computer hard disc driver of the present invention by following technical proposal; it comprises an acceleration sensing equipment, a microprocessor and a magnetic head mobile device; this acceleration sensing equipment is used for the detection computations machine and whether is in a movement of falling object; when detecting this state, just send a signal to microprocessor; microprocessor detects this state continuance after a schedule time; order magnetic head mobile device is withdrawn magnetic head from harddisk surface, thereby avoids clashing into the disk failures that causes because of magnetic head.
The protective device of portable computer hard disc driver of the present invention and the advantage of method are: use an independent microprocessor, can be independent of host cpu and carry out faster more reliable protection operation.And because the present invention is self-contained microprocessor, making various portable computers not need to do change is applicable the present invention.
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.
[description of drawings]
Fig. 1 is a functional block diagram of the system element of the protective device of portable computer hard disc driver of the present invention and method.
Fig. 2 is the protective device of portable computer hard disc driver of the present invention and a process flow diagram of method execution in step.
[embodiment]
Please refer to Fig. 1, portable computer 10 of the present invention comprises a central processing unit 11 and a hard disk drive units 12.This hard disk drive units 12 comprises a hard disc apparatus 13, this hard disc apparatus 13 comprises a disk, a magnetic head, a driver and an axle center, said elements all is encapsulated in the housing, this hard disk drive units 12 also comprises the microprocessor 14 of a control hard disk drive, computing machine 10 is when operate as normal, microprocessor 14 carries out communication with central processing unit 11, and carries out the transmission and the reception of signal between the magnetic head of hard disc apparatus 13 and disk.
One acceleration transducer equipment 16 is connected to the little processing 14 of control, and this acceleration transducer 16 is used for the acceleration of detection computations machine when mobile, and transmission signals is given microprocessor 14.
Please refer to Fig. 2, Fig. 2 has described workflow diagram of the present invention.First design object of the present invention is to fall that Shi Yaoneng enough provides unloader signal soon so that magnetic head is taking place to withdraw before the bump at computing machine, second design object of native system is that the slight jitter in the computing machine moving process is not can damage hard disk the time, will there be sufficiently long delay in system stoping the withdrawal of magnetic head, thereby guarantees that normal hard disk operation proceeds.
After computing machine 10 starts, whether acceleration sensing equipment 16 detection computations machines 10 are in and fall or the free-falling state, as detect this situation and give control microprocessor 14 with regard to transmission signals, when control microprocessor 14 detects computing machine and is in free-falling state or zero anchorage force state and reaches the time of a predetermined length, just sending signalisation hard disc equipment 13 removes magnetic head and unload from disk, in such computing machine, control microprocessor approximately will spend 30 milliseconds of magnetic heads of withdrawing after signal is provided.
In addition, need the time of setting to postpone, to such an extent as to this time delay is used for guaranteeing that the time long enough magnetic head of free-falling can touch hard disk and cause real damage.For example, computing machine 10 freely falling body under action of gravity approximately needs 125 milliseconds of times for 3 inches, if the longer distance of freely falling body just need be withdrawn magnetic head to avoid hard disk to sustain damage from hard disk, but when the distance of freely falling body less than this apart from the time, these vibrations are not enough to make magnetic head to be damaged to disk.If after detecting acceleration, just trigger this guard method in a too short time, may cause maloperation, as in the environment of some high speed vibrations such as aircraft and motor vehicles, this 1～2 millisecond vibrations can be tolerated.
Like this, time delay can be chosen as from beginning to detect freely falling body back 90 milliseconds of beginning takes place, after during this period of time, and signaling magnetic head withdrawal again, magnetic head withdrawal required time is 30 milliseconds.Therefore, behind 120 milliseconds of freely falling bodies, the unloaded hard disk that makes of magnetic head is in guard mode, can make hard disk bear a very large bump.Realize among the present invention that the delay during this period of time before the head unloading is to use analogue integrator or digital integrator to realize.
In the present embodiment, shock sensor and other functions are integrated in the harddisk driving unit 12, control microprocessor 14 also is integrated in the harddisk driving unit 12, and this control microprocessor in time unloads magnetic head from quickening sensing equipment received signal and fill order from harddisk surface
Claims (7)
1. the protective device of a portable computer hard disc driver, mainly comprise an acceleration sensing equipment, a microprocessor and a magnetic head mobile device, it is characterized in that: described acceleration sensing equipment is connected on the microprocessor, the motion state of this acceleration sensing Equipment Inspection computing machine; The operation of this microprocessor control hard disk drive, this microprocessor receive transducing signal and respond this magnetic head mobile device of this signal command from acceleration sensing equipment magnetic head is withdrawn from harddisk surface.
2. portable computer hard disc protective device as claimed in claim 1 is characterized in that: this microprocessor is to be integrated in hard disk inside.
3. the guard method of a portable computer hard disc driver; it is characterized in that: its step comprises the motion state of acceleration sensing Equipment Inspection computing machine; with the direct-connected microprocessor control head of acceleration sensing equipment mobile device magnetic head is withdrawn from harddisk surface; when detecting computing machine and be in movement of falling object state; with this state notifying microprocessor; microprocessor is withdrawn magnetic head at control head mobile device after postponing after a while from harddisk surface, above-mentioned retraction operation is 30 milliseconds or time still less.
4. the guard method of portable computer hard disc as claimed in claim 3 is characterized in that: wherein postpone for some time from beginning to detect between the withdrawal magnetic head.
5. the guard method of portable computer hard disc as claimed in claim 4 is characterized in that: wherein this time delay is at least 90 milliseconds.
6. the guard method of portable computer hard disc as claimed in claim 4 is characterized in that: its state-detection comprises detection one free falling body state.
7. the guard method of portable computer hard disc as claimed in claim 3 is characterized in that: this microprocessor is included in the operation of mentioning for the first time of hard disk inside and comprises a read operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN021344957A CN100407155C (en) | 2002-07-31 | 2002-07-31 | Protector and protecting method for portable computer hard disc driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN021344957A CN100407155C (en) | 2002-07-31 | 2002-07-31 | Protector and protecting method for portable computer hard disc driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1472648A CN1472648A (en) | 2004-02-04 |
| CN100407155C true CN100407155C (en) | 2008-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN021344957A Expired - Fee Related CN100407155C (en) | 2002-07-31 | 2002-07-31 | Protector and protecting method for portable computer hard disc driver |
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| Country | Link |
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| CN (1) | CN100407155C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100618866B1 (en) * | 2004-10-02 | 2006-08-31 | 삼성전자주식회사 | Method and apparatus for detecting free falling of an electronic device |
| WO2006080225A1 (en) * | 2005-01-31 | 2006-08-03 | Hitachi Metals, Ltd. | Fall detecting method and fall detecting device |
| US7151643B2 (en) * | 2005-04-22 | 2006-12-19 | Kabushiki Kaisha Toshiba | Apparatus and method for protecting a disk drive in a hardcopy device |
| CN101535919B (en) * | 2006-06-22 | 2015-03-18 | 创造者科技有限公司 | Auto-closable flexible display device |
| CN100409316C (en) * | 2006-07-21 | 2008-08-06 | 无敌科技(西安)有限公司 | Data anti-damage method of magnetic disc type storage medium |
| CN101211566B (en) * | 2006-12-30 | 2010-09-29 | 联想(北京)有限公司 | Mobile terminal and hard disk protection method |
| US9047907B2 (en) * | 2011-06-23 | 2015-06-02 | Western Digital Technologies, Inc. | Electronic device avoiding false detection of free fall event based on detected operating modes |
| CN102902636B (en) * | 2011-07-29 | 2016-03-02 | 联想(北京)有限公司 | A kind of method of hard disk protection, device and electronic equipment |
| CN103902478A (en) * | 2012-12-26 | 2014-07-02 | 联想(北京)有限公司 | Hard disc protection method and electronic device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002100180A (en) * | 2000-09-22 | 2002-04-05 | Toshiba Corp | Magnetic disk unit |
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2002
- 2002-07-31 CN CN021344957A patent/CN100407155C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002100180A (en) * | 2000-09-22 | 2002-04-05 | Toshiba Corp | Magnetic disk unit |
| US20030067705A1 (en) * | 2000-09-22 | 2003-04-10 | Kiyoshi Ishiyama | Disk drive |
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| CN1472648A (en) | 2004-02-04 |
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