Can't identify four reasons mobile hard disk
A, set the installation issues related to the system
1. Do not think that as long as there is USB port can use the mainboard mobile hard disk, it remains to be seen whether the system support. Windows, Windows xp and above version of the system can be directly support mobile hard disk, do not need to install the driver can be used, and under Windows98 using mobile hard disk must be installed driver, otherwise the system will move hard disk identified as "unknown" USB devices.
2. For some Windows98 users, after installed mobile hard disk driver, can see the mobile hard disk from the device manager icon, but in the resource manager have no corresponding drive logo, this is improper system Settings. Double-click on the mobile hard disk in the device manager icon, and click "properties" button in the pop-up window, can see at this time "disconnect", "delete", "synchronous data transmission" and "INT" 13 units four options, including "can delete" before a system is off by default and check this option to restart the computer after, can be seen in the resource manager of new mobile hard disk drive.
Second, motherboard USB interface problems
Because the motherboard is a problem with the USB interface trigger a mobile hard disk can't normal use, mainly from the following aspects:
1. USB port is not open: on some old machines (including some name-brand computer), while there are external USB interface, but in the BIOS is off by default, so even if the system support, so should check whether the USB option in the BIOS Settings on: press and hold Del on start button, enter the BIOS Settings, the "Chipset the Features Setup" or "Integrated Peripherals" will "OnChip USB" set to "Enabled", save and reboot the computer.
2. The system does not support USB interface: it is also mainly appear in some old computers. As compatibles, the motherboard is the flagship VISTA710V2, motherboard chipset used VIA Apollo MVP3, an external USB interface card after system didn't recognize (Windows Me or Windows 2000 dual system), can't find in the "device manager" "universal serial bus controller". Get online check, the original is the mainboard chipset has a problem, to download the latest motherboard BIOS refresh and download again VIA USB driver patch for this chipset, finally on my computer recognizes "mobile storage devices.
3. USB port power supply shortage: the vast majority of mobile hard disk is normal work the required 5 v, 0.5 A current voltage can be directly through the USB port to supply motherboard, but some motherboard USB interface power supply less than the value, leading to A mobile hard disk cannot be system identification. Fortunately, in the special USB cable mobile HDD caddy fixings mostly tell a PS / 2 connector, as long as the plug the connector into the main board of the PS / 2 interface.
3, improper operation lead to move hard disk can't be used
Due to improper operation caused by mobile hard disk cannot be used properly, is mainly refers to the timing of the plug mobile hard disk didn't grasp well.
1. The best closing before splicing mobile hard disk is running a variety of applications, and do not plug in the system boot process.
2. Will there be a mobile hard disk just connected to systems to recognize dish, loading process, before the end of this process is best not to do anything (offered to mobile hard disk points less area, points in the area, the more the system recognize plate the longer), will have to wait until the mobile hard disk of the working light is stabilized before operation.
3. The use of mobile hard disk to use, also can appear before again and again, it can't use occasionally, when this happens to the "system" in the "unknown USB device" to delete, and then remove the mobile hard disk, and then restart the system, and then connected, mobile hard disk failure generally can solve.
Four, the mobile hard disk itself
If you ruled out the cause of the problem above, still can't use mobile hard disk, it may be there is something wrong with the mobile hard disk itself. Mobile hard disk structure is relatively simple, mainly composed of HDD caddy fixings and laptop hard drive, HDD caddy
fixings generally not easy bad, caused problems mostly laptop hard disk. In order to avoid the mobile hard disk itself hardware damage, in use should pay attention to the following aspects:
1. The mobile hard disk smooth when use, should be put in place, don't move when it is read and write is shaken.
2. Should be strictly in accordance with the procedures when remove the mobile hard disk operation, such as hard disk not read disk, double-click the task bar "pull out or pop-up hardware" icon in the lower-right corner of the window, in the event of a window in the "stop" the use of the equipment first, and then removed from the system equipment options, and then remove the mobile hard disk from the host (remember that do not unplug when hard disk read and write, otherwise easy to damage the laptop hard disk).
3. Even in the non-working state, vibration is also the biggest killer of mobile hard disk, which requires a user in mobile hard disk to carry out to take effective damping measures (some brands of mobile hard disk to do better in this respect, the device itself has taken a shockproof measures), had better put it with plastic bubble around the box.
Ctrl + Shift + N shortcut key to easily create fol
Keyboard shortcuts can effectively save computer operating time, but some people just too accustomed to the mouse operation, or are too lazy to use Ctrl + C and Ctrl + V.
With the advent of the new Windows 7 system, we seem to overlook the many useful shortcuts. Since two keys on the keyboard to achieve the same operation, and why we need to take the trouble to click the mouse it? Today Xiaobian want to share with you is Ctrl + Shift + N shortcut key, I hope you all like the shortcut key .
Role: Create a new folder
Shortcut keys: Ctrl + Shift + N
If you want to use the mouse to create a new folder, you need to take the following steps: Right-click the mouse -> New -> Folder. Now, MP-07F33U4-4424H Keyboard Ctrl + Shift + N shortcut key step to get. Use this shortcut, you can create a new folder in any position that you can create a folder in the Windows 7 system.
Note: You need to be in the folder window, press Ctrl + Shift + N for the job, opened an incognito window in Chrome shortcuts.
Windows 7 system itself supports the operation of many shortcuts, of course, some are more prevalent in XP era, but some of the new features are more practical for office must make good use of your office get twice the result with half the effort.
Laptop keyboard common fault analysis and maintena
Laptop keyboard common fault notebook computer keyboard met the most common problem is: key cap off can't go back, support fracture, he labber and too dirty to clean up. Key cap off put back in the notebook computer users are common, we put the most difficult of COMPAQ key cap as an example.
First of all, please ensure that support has been properly installed, you can use the fingernail gently pick the support, if it can normal movement up and down is no problem, otherwise please first support pack good, in not installed correctly on the support of the forced into key cap is will cause damage.
If support has been installed, please pay attention to key cap central part has a trunk, the trunk and support center in the middle of the elastic rubber the concave part must be corresponding. Installation method is first eased the key cap on support, slowly to and fro and around mobile, until the key cap at the back of the corresponding raised the elastic rubber in the middle of the undercut site, correct alignment will feel mobile key cap by elastic rubber resistance, then can the key cap pressure, key cap the card tenon will automatically clamp support, issued in the luo da sound, in the key cap at the four corners, to ensure that the four card tenon have correctly bite support, then key cap can be used.
Support break more troublesome, you can look at the broken support is still can barely operation, if you can, don't tube he, forced mount, later use careful is, if support have fracture to can't use, so can consider the other use at least the key support in come, so that we can not influence the emergency work. Key cap support is very tiny vulnerable parts, must be careful operation.
If is he splashed water into the keyboard, should be in first time machine upside down in order to avoid water flows into the motherboard cause disastrous consequences. Then pulled out power and battery forced shutdown, simply press the power switch forced shutdown is not enough, because the Lord has battery could still short circuit, so be sure to take off the battery and disconnect the ac adapter.
Then use dry cloth blot keyboard surface water, try to remove the keyboard dry at the back of the water, then dry in the shade (had better not use hot air blow), and at the same time, the main internal use cold wind day, or boot is probably a wisp of smoke go west.
Water dry after, if you find any part of the key failure, please check again the keyboard water is dry, inspection of key keyboard eduction connection position, generally speaking now notebook keyboard
is not because of a bubble water is thoroughly clean up, as long as there are still much hope do it back.
If your keyboard is dirty to clean up, to buy a good brush hair will fall, the notebook computer shutdown back side stand, and then carefully clean keyboard gap. Brush to keep dry do not have water! After finish with a bowl of water to add a drop of detergent, with cotton wet to twist dry to clean, dry surface keyboard after they may be put into use.
Hard disk maintenance
1, to keep the computer clean working environment
Hard disk communicates with ultra-fine filter paper breathing hole with outside, it can be used in the indoor environment of the ordinary non-purifying apparatus, the surface of the if serious environmental dust, will be adsorbed to the PCBA, the interior of the spindle motor and plug breathing filter, so must dust. There humid environment, voltage instability may result in damage to the hard disk.
2, develop proper shutdown habit
Hard at work suddenly turn off the power, the head and the disc may cause violent friction and damage to the hard disk, but also so that the head can not properly reset the hard disk scratches. The shutdown must pay attention to the panel on the hard disk light is still flashing, only when the hard disk light stops blinking hard after the end of the read and write before shutdown.
3, the correct mobile hard drive, pay attention to earthquake
The best mobile hard disk hard drive completely stalled after waiting for shutdown ten seconds. Boot disk rotates at high speed, and gently shake the disk and the head may mutual friction arising from the floppy disk bad track or head damage. So, in the boot of the state, do not move the hard disk or chassis shutdown ten seconds, it is best to wait for the hard drive completely stalled and then move the host or restart the power supply to avoid power due to transients on the hard disk damage. Installed in the hard disk, the demolition process should be more careful, hard disk mobile transport non-bump, the best protection with foam or sponge packaging, to minimize vibration.
Note: The hard disk manufacturers so-called "anti-collision ability" or "shock system" on the hard drive in the state does not start the shockproof, anti-collision capabilities, rather than turned on.
4, the user can not dismantle the Hard Drive Cover
In addition, the hard drive manufacturing and assembly process is absolutely dust-free environment, remember: the general computer user can not dismantle HDD Cover or dust in the air into the hard disk, high-speed low-flying head assembly rotates driven dust or dirt can make heads or disc damage, leading to loss of data, can continue to use the hard life will be greatly shortened, and even make the entire hard disk scrapped.
5, pay attention to the anti-high temperature, moisture, anti-electromagnetic interference
Hard working conditions and life of the great temperature preferably 20 ~ 25 ?, the temperature is too high or too low will be hard to use in temperature of the crystal oscillator clock speeds change, it will result in a hard circuit component failure, the magnetic media will cause a recording error due to thermal expansion effects; temperature is too low, the moisture in the air will be condensed in the integrated circuit element, resulting in a short circuit.
Also available software monitors hard disk temperature
DTemp is a software to monitor hard disk temperatures, it can be reported to the user hard disk in real time operating temperature, and allows the user to customize the upper limit of a temperature, to prevent the hard disk temperature is too high and unstable work situation. YORK download channels downloaded to of size 93.5KB software only after extracting the software, you will find that there has been a drive like a small icon in the task bar at the bottom of the screen, icon above accompanied by a changing temperature display This temperature is the hard disk to the current working temperature. Double-click the icon, there will be a setup interface, which, "Check temperature every (1) minutes" one to detect the hard disk temperature cycle, it is recommended that you select the default setting (one minute). "HDD critical temperature (40) ?" one to set the temperature of the hard drive on the limit. Where users need to use the hard disk speed, 5400 rpm hard drive, it is recommended that is set to 40 ° C, 7200 rpm can be set to 50 ° C. With color selection "Normal temperature color" and "Critical temperature color" two for the hard drive in normal temperature and different states beyond the upper limit, we can according to their own preferences to choose, as long as the eye-catching to. Option "Warning about critical temperature" is to allow the user to select whether or not to issue a warning when the hard drive beyond the upper limit? There is no doubt that we should select "Yes". "Warning about SMART failure" one is to allow the user to select whether to issue a warning when the hard disk problems when the hard disk "SMART" technology it on the hard disk of the security is very important, and is recommended to select "Yes".
When the humidity is too high, the surface of the electronic components may adsorb a water film, oxidation, corrosion, electronic circuits, resulting in poor contact, even short-circuit, but also so that the magnetic force of the magnetic media change, resulting in data read and write errors. The humidity is too low, easy to accumulate large amounts of electrostatic charge generated by the machine rotation, these the static will burn CMOS circuit absorb dust and damage to the head, scratch disk slice. The humidity inside the room is preferably 45 to 65%.
Also, try not to make the hard drive close to strong magnetic fields, such as speakers, speakers, in order to avoid the data recorded by the hard magnetization and damage.
6, to defragment your hard disk regularly
Regularly defragment the hard disk can improve the speed, if the debris has accumulated too much not only access to reduced efficiency, may also damage the tracks. But do not often defragment the hard disk, it will also undermine the hard life.
7, pay attention to the prevention of viruses and Trojan Trojans
The key objectives of the hard drive is a computer virus attack, should pay attention to the use of the latest anti-virus software to prevent the virus. Hard disk regularly antivirus, and pay attention to the protection and regular backup of important data. Recommendations of unknown origin applications usually do not just run to open e-mail attachments, be sure to check the virus and Trojan before running.
8, correct to take the hard way to
Direct contact with the hand in computer maintenance should seize the hard drives on both sides, and to avoid the back of the circuit board, light-light, do not bump or collision with other hard objects; not hand casually touching the hard disk on the back of the board, hands may be static, electrostatic damage to electronic components on your hard drive, can not run correctly. There Never hot plug.
9, so the rest of Intelligent drive
So hard intelligence into the "off" state, the temperature and lifetime of hard work to give a great help, first enter the "My Computer" Control Panel double-click with the left mouse button, then select "Power Management", "Turn off hard disks" to set a time for 15 minutes, you can exit after application.
10, easy not low grid
Do not low-level format of the hard disk operation, avoid unnecessary disc performance.
11, to avoid the frequent high-level formatting operation
It also the disc performance impact, repartition, plus parameters can be used "Q" quick format command.
12, hard disk bad sectors
Hard disk, such as bad sectors, even if it is a cluster may have a proliferation of destructive, as soon as possible to find the businesses and manufacturers to replace or repair during the warranty period, the warranty period has expired minimize format the hard drive to reduce the spread of bad clusters.
13, to make good use of the Disk Utility
Make good use of all kinds of disk tools, such as the Norton Utilities, Norton CleanSweep, regular clean your own hard drive, can improve overall system performance.
14, RESCUE DISK
Norton Utilities software tools to the hard disk partition table, boot record, and CMOS information is saved to a floppy disk, just in case.
15, try not to use the hard disk compression technology
When the compressed volume file is gradually increased, the hard disk read and write data is greatly slowed. If the capacity of the disk is enough, it is not necessary in the use of the hard drive compression technology.
Hard Drive Caddy Material
Hard Drive Caddy currently on the market is very strange, and removal of various shapes aside, this weight is also a big difference, and only a few dozen grams small, large full couple of pounds of multiple main materials used in Hard Drive Caddy different. Hard Drive Caddy common materials are generally three kinds of plastic, aluminum, and aluminum-magnesium alloy, the difference between these materials is not only manifested in Hard Drive Caddy weight, also showed different thermal performance.
Hard Drive Caddy cheap commonly used plastic material, the cooling effect is poor. Product with such a short period of time to use the hard disk also appeared normal, but if a long period of continuous work, the hard drive heat generated is difficult due to poor thermal performance of plastic Hard Drive Caddy cleared, siltation into Hard Drive Caddy temperature straight up, causes the hard disk to severe stagnation, data corruption, and even crash. Brand manufacturers and informal vendors IBM Thinkpad W500 Hard Drive Caddy+Rails mostly using aluminum material, even aluminum-magnesium alloy material, they greatly reduce the quality of the Hard Drive Caddy, but also as a good conductor of heat, they have a better heat effect, can make your hard drive longer, more stable work.
Other material related to the seismic performance of the Hard Drive Caddy. Vibration is hard taboo, ranging from data loss, it caused heavy damage on track, Hard Drive Caddy design lies in portability, Hard Drive Caddy seismic design is the key. From this point, those thin, small size of the guy but does not have the advantage.
Mobile storage devices
1) USB flash drive
USB flash drive is also commonly known as USB or U disk, a semiconductor as the storage medium of data storage devices, hard disk and floppy based on the magnetic material as a storage medium, which is between them. the main difference.
Compared with other mobile storage, USB flash drive has a small size, high reliability. Just the USB flash drive into your computer's USB interface can be used directly, and flash memory chips to store data does not need to maintain the voltage, the energy consumption is mainly used for reading and writing data. The common flash drive capacity of 64MB, 128MB, 256MB and 512MB of several.
2) removable hard disk
Hard Drive is a high-capacity mobile data storage devices, its volume is larger than the USB flash drive, the capacity is much greater. Its data storage media are generally semiconductor materials. Mobile hard disk using the USB interface to transfer data storage capacity of 10GB, 20GB, 40GB and 80GB of several.
USB flash drives and portable hard drives
3) The activities of the hard disk
The activities of the hard disk is used by ordinary activities Hard Drive Caddy installed hard drive as a removable hard disk. Activities HP Compaq 6720S Hard Disk Drive Caddy with Screws
trailers are generally installed in the chassis, and when to use the hard disk activity in the shutdown state, the activities of the hard disk into the activities of the hard drive rack can.
Active hard disk box data cable and power cord connection on the motherboard, hard disk box to connect to the hard disk in the box, and then connected through the IDE interface of hard disk box. Relatively speaking, this connection is not very convenient, but does not support hot swap. But there are also the activities of the USB interface HDD Enclosure, HDD Enclosure connection using the USB interface is very convenient, but also hot-swappable.
Explain the LCD monitor
LCD and CRT works completely different, due to an internal lamp, so it not suitable for long driving, it is recommended that the LCD user closes the screen saver function. In short, the screen saver on the LCD display no protective effect.
The LCD monitor works: LCD (LiquidCrystalDisplay), LCD screen, its core structure similar to a "sandwich" the middle of the two glass substrates filled with the liquid crystal molecules of the movement. Signal voltage of the direct control of the switching state of thin film crystals, re-use the transistor to control the liquid crystal molecules, the liquid crystal molecules has obvious optical anisotropy, LCD inverter modulated light from the backlight lamp launch, the image display. Constitute a complete display by the number of pixels, each pixel is like a switch transistor. So that you can control the display resolution. If an LCD resolutions up to 1024x768 (XGA), it represents both 1024X768 pixels to display. Works from the LCD can be explained by a lot of people will be asked questions such as why the best resolution of the LCD fixed LCD refresh frequency is why only 60Hz.
We can see by the above-mentioned LCD works, one is the image of the LCD, the liquid crystal molecules have been in the switch state, a response time of 20ms of LCD for 1 second, the liquid crystal molecules switch hundreds of times. Switching times of the liquid crystal molecules will naturally be the limit of life, the life of the LCD will appear the phenomenon of aging, such as dead pixels. So when we stop the operation of the computer also colorful repeated movement of the screen saver is undoubtedly still in the state of repeated switching the liquid crystal molecules on the screen.
Hard disks: SATA, ATA difference
Serial senior technical accessories (SATA) is a new standard electronic interface technology. SATA performance is expected to more than previous generation technology, parallel ATA, because it can provide higher performance, and the cost was just SCSI or fibre channel, a small part of the traditional storage technology.
Just as its name implies, SATA only a serial links interface standards, used to control and transmission server or storage equipment to the client applications between data and information. SATA Hard Drive to storage equipment such as Hard Drive Connector
connected to the motherboard, and enhance the system performance, improve efficiency, greatly reduce development costs.
To understand the advantages of SATA, needs to understand parallel ATA. Parallel ATA is based on integrated drive circuit (IDE) interface standards of a hard drive technology, used for transmission and exchange of computer motherboard bus to disk storage of data between devices.
Many of the low end to connect to the network storage (NAS) equipment is the parallel ATA drives, because of cost effectiveness. In addition, but also because of the many high bandwidth applications, such as backup and restore, video monitoring, video processing and use disk and not nearly line tape storage.
The SATA storage equipment configuration up than the parallel ATA much easier, this down to its smaller format parameters. SATA cables used than parallel ATA longer and more fine, the latter USES, thick short and easy to fracture of the cables. In addition, the SATA connector 7 needle data, not parallel ATA 40 pin connector.
Connected to a disk drive the thick cable assembly up more difficulties, but also can stem airflow, cause fever, that will affect the hardware of the whole system performance and stability. SATA laid and installation up much more simple, compact disk drive for the mainboard and have made the extra space.
SATA also use low voltage difference signal technology, this and low power consumption and the cooling of the needs are in agreement. Signal voltage parallel ATA from 5 v down to a mere SATA 0.7 volts. This not only reduce the disk drive power consumption, also narrowed switch controller size.
The interface technology used 8/10 a coding method, i.e. the 8 bits of data bytes coded into 10 character transmission. The serial technology and a BianMaFa 8/10, not only improve overall transmission performance are completely around the concurrent transmission of the existing problems. This data integrity high scheme provided the necessary embedded time and important data integrity check function, and that is the high speed transmission need.
The point of a SATA topology structure, rather than is generally applied to the parallel ATA or SCSI technology based on the structure of the bus, so SATA can provide for each connected devices full bandwidth, so as to improve the overall performance. According to the Working Group SATA * ATA Working Group) claim that because the schedule includes three generations of enhanced data transfer rate: a rate of the equipment are 150 Mbps, 300 Mbps and 600 Mbps, SATA preparations guarantee a decade of steady and healthy development. The new standard is backwards compatible, such serial format conversion into parallel format more convenient, and vice versa, but also can accelerate the SATA speed.
Due to the use of flexible cable, fine connectors, improve the reliability and security data, and the software is fully compatible, SATA will give cheap network storage products to bring the huge market opportunities. Many disk drives and chip manufacturers have announced the release of SATA support product, by more than 80 manufacturers of the working group also obtained the field SATA wide support.