Mobile Hard disk

Move the hard disk as the name suggests is a hard disk for storage media exchange between computers, large-capacity data storage products that emphasize portability. Market the vast majority of mobile hard drives are standard hard drive, but only a small part of a micro hard drive (1.8 drive, etc.), but the price factor determines the mainstream mobile hard drive or portable hard drive as standard. Because hard disk as the storage medium system, removable hard drive in read/write mode and standard IDE hard disks are the same. Mobile hard drives use USB, IEEE1394, transfer faster interface, high speed transfer data with the system. As of 2009, mainstream 2.5 brand mobile hard drive's reading speed is about 15-25MB/s, write speed of about 8-15MB/s.

Features

Large capacity

Mobile hard drives can provide substantial storage capacity is more cost-effective mobile storage products. In bulk "Flash" price, also cannot be accepted by users, and mobile hard disk user acceptable price range provides consumers with a larger storage capacity and good will.

The market of mobile hard drive offers 80GB, 120GB, 160GB, 320GB, 640GB etc, up to 5TB of capacity, to a certain extent, to meet the needs of users.

High transmission speed

Mobile hard drive comes with USB, IEEE1394, eSATA interface, able to provide high data transfer speeds. But mobile hard disk data transfer rate is still somewhat limited by interface speed, especially at USB1.1 interface specification of the product, the transfer of larger amounts of data, will test the user's patience. And USB2.0, eSATA interface IEEE1394, relatively much better. USB2.0 interface transfer rate is 60MB/s, IEEE1394 interface transfer rate is 50 ~ 100MB/s, while the eSATA 3Gbps 1.5Gbps to reach, in between when data is exchanged with the host, read a large file gigabytes in just a few minutes, especially suitable for video and audio data storage and Exchange.

Easy to use

Mainstream PC Basic are equipped with a USB functionality, motherboard usually provides 2-8 x USB port, some monitors also offers USB adaptor, USB has become the must-have in the PC interface. USB device in most versions of Windows operating system, you do not need to install a driver (windows 98 needs), a true "plug and play" characteristics, flexible and convenient to use. But high-capacity hard drives 160G above (so portable General 160G high) due to the high speed of 7200 RPM (notebook more at 5400 go below). why you need an external power supply (USB power supply shortage). to some extent limited the hard drive of portability (! now some notebook provides enhanced power supply design, a USB port can provide up to 1A current) reliability enhancing data security has always been a mobile storage users are most concerned about, is one measure of this kind of product performance is good or bad is an important criteria. Removable hard drive at high speed, large capacity, compact and convenient, and other advantages to win the favor of many users, and the greater the advantage lies in its security and reliability of the data is stored. This class of hard drives and laptop hard disk structure similar to the use of silica disc. This is a more than aluminum, magnetic platters of durable material, and has a larger storage capacity and better reliability, improved data integrity. Adopt silica material of disk drives to more smooth disc surface for features, effectively lowering the disc may have an impact on data reliability and integrity of irregular number plate surface, the greater the hardness of disc surface so that the USB hard drive with high reliability. Also with anti-shock, in violent vibration when the disc is automatically stopped and reset the head to the security zone. Prevent disc damage. Capacity removable disk drive capacity is in MB (megabytes) GB (1000 MB) TB (1TB = 1000G B), 1.8 media drive mostly provide 10GB, 20GB, 40GB, 60GB, 80GB, 2.5 were 120GB, 160GB, 200GB, 250GB, 320GB, 500GB, 640GB, 1000GB (1TB) of capacity, 3.5 inch mobile hard disk cartridge and 500GB, 640GB, 750GB, 1TB and 2TB 1.5TB, large-capacity, in addition to this there are desktop mobile hard drive capacity increased to 4TB of large capacity. As technology evolves, mobile hard disk capacity is growing, the volume is getting smaller and smaller!

Dimensions

Mobile hard drives (cartridge) dimensions into 2.5 inch and two 3.5 inch. 2.5 inch mobile hard disk boxes you can use the laptop hard drive, 2.5 inch mobile hard disk boxes small light weight, easy to carry, no external power supply.

The vast majority of mobile hard drive is a USB interface, but due to the limited capacity of USB interface functionality, so mobile hard drives use 2.5 ' hard disk is actually the same notebook using the hard disk is not the same. Notebook demand hard drive quick start, so portable hard drive-start current larger, about 900mA around. Mobile hard drive with the disc start time on long, starting current smaller, usually around 700mA. All if you own assembling mobile hard disk, or need to find a dedicated mobile hard disk version of the cores.

3.5 inch hard drive cartridge use desktop hard drives, large, relatively poor portability. 3.5 inch hard-disk box generally comes with external power supplies and cooling fans.

Buy

«Ò» ¡ ¢ speed

Philips mobile hard drive

At the approach before copying data to and from work, a slow one minute or even slow one second will make feel restless, so high-speed reading and writing data is critical. In addition, when using the laptop connect mobile hard drive, if the transmission speed is too slow, it will speed up use of shortening the notebook battery.

Mainstream 2.5 brand mobile hard drive's reading speed is about 15-25MB/s, write speed of about 8-15MB/s. If to 10MB/s write speed copy a 4 GB DVD movie onto a removable disk drive, you need to spend time is about 6 minutes and 40 seconds; if to 20MB/s read speed from mobile hard drive copy a 4 GB DVD movie onto a computer hard drive, need time is about 3 minutes 20 seconds.

Usually 2.5 brand mobile hard drive's read/write speed of the hard disk, read/write control chip, USB ports, type three critical factors. 2.5 inch portable hard drive based speed into 4200 go and 5400 go two types, in addition to speeding up the hard drive's read/write speed, many hard drive manufacturers will be hard to read and write caching to increase from 2MB 8MB. The market of the more common 2.5 inch portable hard drive brand with Hitachi, Seagate, Samsung, and other data, in the West, the speed difference between them is not too obvious, in the purchase of brand mobile hard drive does not have to be on the inside of the hard disk type too much.

Relative to the notebook hard drive itself, read and write control chip and USB ports type often determines the brand mobile hard drive's maximum read and write speed. For example, the same is USB 2.0 interface mobile hard drives product, even if it is the same model 2.5 Hitachi hard drive 5400 go, one can provide 28MB/s read speed and the other can only provide 15MB/s read speed, this is because both the main control chip, and other parts caused by the difference. But as consumers, it was hard to understand a mobile hard drive is what type of read/write control chip, came to see from the outside is also very difficult to distinguish whether a genuine USB2.0 Hi-speed ports. Therefore, if you want to know how a certain paragraph brand mobile hard disk read/write speed, how fast, you should go to a professional IT website to view the profiling data for the product, or at the time of purchase with portable compactor try.

Tip: to get a a brand mobile hard disk read/write speed, the best way is to go to a professional IT website to view that product evaluations, or bring the scene to try notebook.

2. power supply

There are many low-quality desktop motherboard chassis front panel USB port power supply shortfall arises, downtime, mobile hard disk could not be found properly Windows System. In case of insufficient power supply will need to move your hard disk for independent power supply, so most mobile hard drives design by DC-IN DC Jack to solve this problem.

For laptops, USB mobile hard drive 2.5 inch, hard disk and data interface power supply from the USB interface. USB interface provides 0.5A while laptop hard drive work 0.7 ~ 1A, General copy of your data will not be a problem. But if the hard disk capacity is large, or moving files is large very prone to power supply and USB interface at the same time to give more than one USB device when the power supply is also prone to supply shortage, data loss or damage to the hard disk. To strengthen the power supply, USB mobile hard drive x 2.5 generally provides an interface from a PS/2 or usb interface for electrical power line. So move large files when you need to connect the PS/2 for electrical power line. (3.5-inch mobile hard disk usually comes with an external power supply, power supply basic does not exist. IEEE1394 interface maximum available 1.5A current, so no external power supply)

Tip: the power issues, in General, a USB power supply is sufficient. However, you might encounter the need to simultaneously meet two interfaces, so when the user selects the best buy one/two USB data cable, avoid power supply is insufficient.

III. quality

There are many so-called branded mobile hard drive actually is assembled by the dealers themselves, that is, manufacturers provide to resellers only mobile hard drive cartridge, dealers get the box before the hard drive installed inside. This brand of quality mobile hard disk cannot be guaranteed, parallel hard drive or even repair hard drive is likely to be trafficking into removable disk cartridge was sold to unsuspecting consumers.

Notebook hard drive channel complex, parallel imports, dismantle goods in the market are not uncommon, but because the manufacturers are genuine recognition method is not too much publicity, where consumers can easily in the process of being cheated. Not to mention the "Zhongguancun Street full of removable disk nursery" hands of fakes, garage, even at the counter to buy, to guarantee absolute genuine nor easy. Parallel imports into smuggled goods and OEM products. Smuggled goods is not in China, sales of products, portable hard drive as a precision degree higher parts, the smuggling of transport process inevitably togeth, assured quality hard, smuggling of things will probably be obsolete products, there was a time of obsolete products of Hitachi, Ltd. to make a lot of heated discussions, on-line also has a lot of discussion, but took note of the resolution of a consumer or not; and OEM products from notebook manufacturers or manufacturers authorized service facility where it flows out of spare parts, although the quality is not necessarily a problem, but the warranty does not satisfactorily. Dismantle goods from many, mainly rework machine's hard disk, because have used, must have a certain strain and aging, terrible problems which is often not immediately be reflected, in general the user buy when successful as long as the format, size correctly does not have any objections, but time will be a problem. In addition, portable hard drive is not like cards and other accessories, agents usually do not give personal user warranty, dealer dropped counters go, there is no way users; also some dealers say one year warranty, actual and replacement time only 3 months, as long as there is no written receipt, users say. So buy the best mobile hard drive is to buy a certain market visibility and reputation of good products.

In addition, the PCB Board of working also on the quality of the mobile hard drive has a great effect. But as an ordinary consumers, it is impossible to disassemble the machine to carefully check the PCB Board (it is very difficult to have the ability to distinguish between the good and bad), when the best way is to go online to search and see if I can find authoritative media player evaluation reports and user evaluation of the trial.

Fourth, the better is more thin

When it comes to mobile hard drive, the mainstream mobile hard disk prices cheaper, more and more thin. But the blind pursuit of low cost and attractive appearance, making many products are not equipped with anti-vibration measures, some even the most basic no earthquake filler (actually is a portable hard drive with a thin layer of plastic or metal box), stored data reliability that can be imagined.

In General, the fuselage shell thinning of seismic capacity of its mobile hard drives (accidental drops) is poor. In order to prevent accidental drops on mobile hard drive is damaged, there are some manufacturers introduced a super resistant mobile hard drive. Many vendors claim that he was 2 meters high, in fact, prevent drops never should be the focus of attention because many mobile hard disk drive products from 5 m to 10 m of height drops even still be intact, but unfortunately only one or two of good luck. Should be concerned about this product through a professional lab in different angles hundreds of times more drops test, usually mobile hard drives crash drops the height of about 1 m (height of the desk, but also ordinary people waist high), purchase products, you have the tactic of rigid foam let dealers give live demonstrations.

5. FireWire

In the standard has not yet come out USB2.0, USB1.1 standard is very slow, read and write speed of the fastest but 1.5MB/s; FireWire interface to read and write speeds of up to approximately 50MB/s, so for quite a long time, FireWire is a synonym for high-speed transmission.

But after the advent of USB2.0 standard, read and write speed up close 60MB/s, so all of a sudden the FireWire interface left behind, and almost all computers have a USB connection port, only a very small computer with FireWire ports, therefore the purchase of mobile hard drive could have considered using FireWire interface model.

However, if you have an Apple computer, this time FireWire can come in handy, and purchase a FireWire interface of mobile hard drive is more appropriate. Overall, the FireWire interface is a dispensable.

VI. additional value

Many brand mobile hard drives are free some anti-virus software, personal information management software, one-click Backup software, encryption software, etc., but in the broadband network is developed, these were not a truly valuable things that could have affected by this temptation.