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I unpluged the USB flash disk before closing a file or an application used with the it, is there any problem? |
2005-8-7 |
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Answer:
Your operating system may prompt a warning message, but, this will not cause any physical damage to your USB flash disk, but the data being transferred will be lost.
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Q. The indicated capacity of the usb flash disk is less than it is marked, why? |
2005-8-7 |
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Answer:
The storage devices, includes USB flash disk, memory cards (CF, SD), hard disks etc, calculates its storage capacity as 1KB=1000 Bytes and 1MB=1,000,000 Bytes. While the operating system like Windows XP count on the standard of 1KB=1024Byts. Due to above reason, the actual capacity may be indicated as 30.8MB(32MB), 62.1MB(64MB), 124MB(128MB)etc.
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When I connect the Flash Disk to a Mac, it recognizes it but asks if I want to format it, what should I do? |
2005-8-7 |
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Your Macintosh computer has been set so that it cannot read Windows-formatted files. You may have deleted this function or initially launched it from a ROM. Please refer to your user¡¯s manual and reset your computer to read Windows files. If you follow the message and format the USB flash disk on a Macintosh, you will not able to use it with a Windows based PC. |
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What's the Benefits of USB Flash Disks? |
2005-8-1 |
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1. Light weight and easy to carry: USB flash drives weigh about the same as a car key ¨C in fact, some USB flash drives are so lightweight that hypothetically it could be only 8 grams. USB flash drives are about the size of a stick of gum. 2. High Capacity: USB flash drives currently can hold up to two gigs of data ¨C that"s over 650 three-minute songs (33 hours) recorded as MP3s or about three times the content of a standard compact disc. 3. If you share a computer, USB flash drives are a great way to store personal information ¨C use them instead of the computer"s hard drive. USB flash drives can maintain data for 10 years! |
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What is USB? |
2005-6-30 |
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USB is a peripheral bus specification developed by PC and tecom industry leaders -- Compaq, DEC, IBM, Intel, Microsoft, NEC and Northern Telecom -- that brings plug and play of computer peripherals outside the box, eliminating the need to install cards into dedicated computer slots and reconfigure the system. Personal computers equipped with USB allow computer peripherals to be automatically configured as soon as they are physically attached - without the need to reboot or run setup. USB also allows multiple devices -- up to 127 -- to run simultaneously on a computer, with peripherals such as monitors and keyboards acting as additional plug-in sites, or hubs. |
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Who created USB? |
2005-6-30 |
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USB was developed by a group of seven companies that saw a need for an interconnect to enable the growth of the blossoming Computer Telephony Integration Industry. The seven promoters of the USB definition are; Compaq, Digital Equipment Corp, IBM PC Co., Intel, Microsoft, NEC and Northern Telecom. |
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What are the benefits of USB? |
2005-6-30 |
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Easier to add new peripherals -- Windows 98 and Windows 95 R2 will automatically recognize devices when you plug them in. Quicker installation of new peripherals -- You won"t have to reboot during installation. Faster--Top USB data speed is around 100 times faster than the fastest serial connection. Greater Expandability -- Using USB hubs you can connect up to 127 devices to your computer, not just be limited to the number of serial ports, parallel ports, or IRQ"s on your computer. Hot Swappable--Changing connected USB devices is as easy as changing a light bulb, just disconnect the old and plug in the new. No need to power down or fumble with drivers. They just plug and go! Eliminates need for external power supplies -- fewer plugs to deal with, and lower cost peripherals. Lower peripheral costs -- will help drive down the cost of computer peripherals by eliminating external power supplies, allowing manufacturers to standardize their products to a single connector, creating a larger customer base by providing the same peripherals for Macs, PCs, and Portables, and reducing returns due to wrong connector types.
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What kind of peripherals will USB allow me to hook? |
2005-6-30 |
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You name it: telephones, modems, keyboards, mice, 4x and 6x CD ROM drives, joysticks, tape and floppy drives, scanners and printers. USB"s 12 megabit/s data rate also accommodates a whole new generation of peripherals, including MPEG-2 video-based products, data gloves and digitizers. Also, since computer-telephony integration is expected to be a big growth area for PCs, USB can provide an interface for Integrated Services Digital Network (ISDN) and digital PBXs |
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What is an USB Hub |
2005-6-30 |
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A USB hub typically consists of a single upstream port (designed to connect directly to your computer or to another hub) and multiple downstream ports. We provide our customers 4-ports, 5 ports and 7-ports models.¡¡It allows you to expand the number of devices you can attach to your computer. |
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What is USB 2.0? |
2005-6-30 |
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Finalized in 2001, USB 2.0 is a complete overhaul to the Universal Serial Bus input/output bus protocol which allows much higher speeds than the older USB 1.1 standard did.
USB 1.1 allowed a maximum transfer rate of 12Mbits/second. That rate is now called "USB." Though some manufacturers label their products Full-Speed USB. Note that this seems a bit deceptive. It¡¯s easy to mistake Full-Speed for Hi-Speed.
You won¡¯t be fooled from now on as you now aware that Full Speed USB is only 12Mbits/second where Hi-Speed USB mode is capable of a much faster 480Mbits/second.
As an aside, USB mice and keyboards need only 1.5Mbits/s to function. That performance level is also named "USB" by the USB Promoter Group.
To sum it up, USB 2.0 specification incorporates three speeds: Hi-Speed, Full-Speed and Low-Speed. You as a consumer don"t need to figure out all the jargons. Just keep in mind that only "Hi-Speed USB" and "USB" host and devices exist.
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Will USB 1.1 devices work on USB 2.0? |
2005-6-30 |
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Yes, all USB1.1 devices can still work perfectly at USB2.0 port. |
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Will USB 2.0 devices work on USB 1.1? |
2005-6-30 |
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Yes, USB2.0 devices can work well at USB1.1 port, but the speed will be limited to the maximum speed of USB1.1, that is 12MBPS. The entire bus under the USB 1.1 root hub will slow to 12Mbps. The operating system will probably notify the user about the sub-optimal configuration and recommend for a better course of action. |
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Will USB 1.1 devices run any faster on a USB 2.0 ? |
2005-6-30 |
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No, USB 1.1 devices will still operate at 12Mbps at full-speed and 1.5Mbps at low-speed on a USB 2.0 bus. Even though USB 1.1 devices won¡¯t run any faster, they can work alongside of USB 2.0 devices on the same bus.¡¡However, the new USB 2.0 architecture allows more high-speed USB 1.1 devices, such as webcams, audio devices, to share the bandwidth.¡¡Developers need to follow USB 2.0 spec in order to design higher speed peripherals that can take advantage of the extra bandwidth. If several USB 1.1 hubs are connected to a USB 2.0 bus, then each of the USB 1.1 hub will get a full 12Mbps bandwidth. |
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How do I distinguish between USB 2.0 and USB 1.1? |
2005-6-30 |
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For all our products, if it is designed as USB 2.0, it will be clearly marked on the item and/or its package. |
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Will USB 2.0 replace USB 1.1? |
2005-6-30 |
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Not entirely, because many products such as generic keyboards, mice, joysticks and audio speakers do not require the faster speed of the new USB 2.0 technology. Only bandwidth-hungry devices, such as webcams, scanners, and high-capacity storage systems, will need all the speed. However, next-generation systems will come with USB 2 ports rather than USB 1.1. |
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How will consumers benefit from USB 2.0? |
2005-6-30 |
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With speed 40 times more than that of USB 1.1, USB 2.0 broaden the range of external peripherals that can be used on a computer. Even with multiple high-speed peripherals connected to a USB 2.0 bus, the system will less likely to hit the bandwidth bottleneck. The new specification also inherits the current USB¡¯s Plug and Play and hot-swapping capability as well as providing backward compatibility for USB 1.1 hardware, allowing existing user base to upgrade seamlessly. |
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How fast is USB 2.0? |
2005-6-30 |
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USB 2.0 has a raw data rate at 480Mbps, and it is rated 40 times faster than its predecessor interface, USB 1.1, which tops at 12Mbps. Originally, USB 2.0 was intended to go only as fast as 240Mbps, but then, USB 2.0 Promoter Group increased the speed to 480Mbps in October 1999. |
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