Mobile hard disk as the name suggests is hard disk for storage interface system, emphasizes portability of storage products. On the market at present most of the mobile hard disk are standards based on the hard disk, and only a few part is based on micro hard disk (1.8 inch hard disk, etc.), but the price factors determine the mainstream mobile hard disk or on the basis of the standard notebook hard drive. Because of the hard disk for storage interface, so the mobile hard disk in the data model of reading and writing and standard IDE hard disk is the same. Mobile hard disk with USB interface, IEEE1394 transmission speed faster, can high speed and systems for data transmission.
The characteristics of the mobile hard disk
Large capacity
Mobile hard disk can provide a large storage capacity, is a more competitive price of the mobile storage products. In the large capacity "flash" price, and cannot be accepted by the users, and mobile hard disk can, within the scope of user can accept the price, to provide users of large storage capacity and good portability. Market at present the mobile hard disk can provide 10 gb, 20 gb, 40 gb capacity, to a certain extent, to satisfy the needs of users.
Transmission speed
Most of mobile hard disk with USB, IEEE1394 interface, can provide higher data transmission speed. But the mobile hard disk data transmission speed is restricted by the speed of the interface to a certain extent, especially in USB1.1 interface standard products, in the large amount of data transmission, will test the user's patience. And USB2.0 and IEEE1394 interface is relatively better.
Easy to use
PC basic are now equipped with USB function, main board can usually provide 2 ~ 8 a USB port, some display will also provide the USB adapter, USB interface has become necessary in the PC interface. USB devices in most versions of the WINDOWS operating system, can not need to install the driver, a true "plug and play" characteristics, flexible and convenient to use.
Reliability of the ascension
Data security is always the mobile storage users most concern, is also an important measure of this kind of product performance is good or bad people. Mobile hard disk with high speed, large capacity, easy and convenient advantages to win the favour of many users, and the advantages of greater still lies in its storage the safety and reliability of the data. This kind of hard disk similar to the structure of the notebook computer hard drive, use silica more blanks. This is a kind of material is more durable than aluminum, magnetic disks, and with greater storage capacity and better reliability and improve the integrity of the data. Using silica as materials of disk drives, characterized by more smooth disk, effectively reduce the disks may affect the integrity of the data reliability and irregular the number of disk, disk higher hardness make USB hard disk is of high reliability.
Along with the development of multimedia technology, computer data capacity is more and more big, in the past that kind of transfer data on a floppy disk method obviously already can not adapt to the needs of the now. In recent years instead of the U disk, mobile hard disk, the former volume is small, but due to the capacity is limited by the price, only applies to hundreds of MB the following data storage. In the school teaching, multimedia courseware teaching resources such as the data quantity is bigger, often need more storage space, mobile hard disk should be the most appropriate choice. So, how to choose a suitable mobile hard disk? Below the author, combining with the experience their own use mobile hard disk to the talk.
Mobile hard disk is the middle of the large capacity data exchange between computer memory, general when choosing a mobile hard disk, the factors are capacity, interface properties, volume and additional function, and of course the price. Below the specific about when choosing mobile hard disk factors to consider:
1. The capacity. Sales on the market of mobile hard disk in the capacity of 4.7 GB ~ 40 GB range, from the perspective of the use nature, 4.7 GB ~ 20 GB is enough, because the mobile hard disk only as transitional storage medium, there is no need to use a lot of capacity. But due to the hard disk capacity and the price is not proportional to, large capacity tend to have higher performance to price ratio, and less than 20 gb hard drive most is the product that has been eliminated, so proposal should choose when buying a new mobile hard disk of the 20 gb or more, but if buy HDD caddy fixings back their assembly that is another matter.
2. Size. Mobile hard disk composed of hard disk and HDD caddy fixings, including the interface and the control circuit. Mobile hard disk there are usually two kinds of specifications: 2.5 inches and 3.5 inches, corresponding to the laptop and desktop computer hard disk. 2.5 inch disk the size and weight of the smaller, more easy to carry, but the price than 3.5 inches your hard disk. Generally recommended to choose 2.5 inches hard disk.
3. The interface. Mobile hard disk with USB interface commonly (early have also had the IDE interface, but it is not convenient to use, to open chassis connections), but must pay attention to the USB interface with USB1.1 and USB2.0 two specifications, the latter of the data transmission speed faster than the former hundreds, and the speed of the built-in computer hard disk exchange data basically the same, but the price is a bit expensive. Choose mobile hard disk should be first USB2.0 interface.
4. Buying finished goods or DIY. Mobile hard disk can buy products directly, but also can be in the computer market to buy the right move HDD caddy fixings (there is no hard drive, including the corresponding USB driver circuit, interface circuit and turn the USB connection and external power supply), with 2.5 inch notebook computer hard disk after DIY your own USB mobile hard disk. Move HDD caddy fixings price about 100 ~ 150 yuan, deserve to go up by the old laptop computer and machine hard disk (1 gb ~ 4 gb price in 100 ~ 300 yuan) the mobile hard disk price is in 200 ~ 400 yuan can, high cost performance.
Should pay attention to when buying the mobile HDD caddy fixings also has the difference between size and interface specification, you can reference the above instructions. Is the author's own mobile hard disk with a 2.5 inch USB2.0 move HDD caddy fixings add a 4.7 GB of second-hand notebook computer hard disk DIY, total prices but 400 yuan (two years ago). Installation is very simple, as long as the interface and the hard disk docking it is ok to insert (FIG. 2 for the mobile hard disk data interface circuit, mobile hard disk installed in figure 3).
Mobile hard disk to use in pay attention to the problem
(1) the connection to the mobile hard disk, mobile hard disk of the USB cable is not only the data transmission, it is hard work power supply line, the line is too long can cause resistance increase and the data, make mobile hard disk can't work normally, so pay attention to: USB turn wiring the shorter the better, in addition to the original configuration cables, should not be connect extension cord; Second is should choose to connect with computer box behind the USB interface (directly fixed on the main board interface), and should not use the interface in front of the chassis (which is by the motherboard after a period of wire connected to the front panel).
(2) mobile hard disk of the external power supply, mobile hard disk work hard disk and data interface of the power supply is provided by the computer's USB port. But in the use of more than 10 gb mobile hard disk, simply rely on the USB line to drive power supply may be because of a lack of power to work is not normal, this time will use external auxiliary power supply (dc stabilized voltage source). Move HDD caddy fixings not so expensive, around 100, my figure is beautiful (NOONTEC), is good. Move HDD caddy fixings has two kinds, a kind of box is a small board, the hard disk is "put" in the above, the fixed isn't very good, is a big board, hard disk is "plug" in the above, this is better, buy the best open, look at the big plate is better.
Mobile hard disk, samsung is better, buy 5400 turn, 2 m of cache line, 8 m the good is good, is too expensive.
(3) although mobile hard disk with USB interface, can support hot swap, but should pay attention to in use process (Windows Me / 2000 / XP system) must ensure that closed the USB interface can remove USB attachment (mouse click next to the date of the USB interface, close interface), or in a high-speed operation of the drive sudden power outage may cause damage to the hard drive
Mobile hard disk failure analysis of several kinds of reasons
Storage capacity, in order to be able to conveniently many of my friends to buy mobile hard disk of the USB interface, but in the use of the time but found that the system can't identify mobile hard disk. Is this why?
1, setting up the CMOS parameters
Has not been used for USB external equipment friend, even if properly installed the driver also possible system can't detect USB hard drive, this is mainly due to the main board the default CMOS port is closed, if you don't have it set to open, so Windows nature cannot detect the mobile hard disk. In order to solve this problem, we can the reboot, in the CMOS setup window, and in the PNP/PCI CONFIGURATION "column will be" it IRQ For USB "a set to" Enable ", this system can be assigned to USB port can be used the interruption of the address.
2, lack of power
Due to the USB hard disk at the time of the work also needs to consume a certain amount of power, if direct through the USB interface to electricity, is likely to appear insufficient power supply. Therefore, almost all the mobile hard disk with the separate external power supply or by taking electric PS2 keyboard interface, then as long as you connect the power converter in advance or by PS2 turn good connections with the keyboard, make sure to try again after enough electricity mobile hard disk, then should be able to normal use. Need special remind everyone's attention, it is suggested that the use of mobile hard disk before ensure sufficient supply, or is likely to be damaged disk due to insufficient power supply.
3, USB extension cable fault
Remove the above-mentioned two aspects reasons, there may be a USB interface type does not lead to move hard disk can't use. Such as the configuration of the computer USB interface is 1.1 standard, and buy mobile hard disk is 2.0 standard USB interface, which requires the connection of computer and mobile hard disk connections must support USB 2.0 standard. Because of the high speed mobile device inserted at hub, the equipment may not be normal installation, and some friends in the use of the mobile hard disk at the same time also use the system, in order to facilitate direct use system attached to the USB 1.1 standard connections, so lead to 2.0 standard USB mobile hard disk can't correct recognition. As long as you will replace the connections for USB 2.0 standard can solve the problem.
4, Windows version is too low
Windows 95 or 97 still in use for some system's friend, even if the computer equipped with a USB port, but before the Windows 98 operating system does not support USB peripherals, so no matter how to install the driver, CMOS parameters can make mobile hard disk normal use. For this kind of situation, a solution is to upgrade to Windows 98 operating system above, another way is to Microsoft's official site to download the corresponding patch let Windows 95/97 can identify mobile hard disk.
5, improper system Settings
For some Windows 98 users, after installed the driver, can from the device manager to check the mobile hard disk icon, but not in the resource manager of the corresponding is, this is caused by improper system Settings. In device manager double-click the mobile hard disk icon, and click "properties" button in the popup window, can see disconnect at this time, delete, synchronous data transmission and Int 13 units four options, including a "delete" in front of the system default is no ticking, as long as you check this option after restart the computer, it can be seen in the resource manager of the new mobile hard disk drive.
Although mobile hard disk could not identify the cause of the problem is more, but generally not USB interface or the fault of mobile hard disk itself, so need you around to rule out more from related part of the consideration, believe you also can use the mobile hard disk.
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