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UNIVERSAL SERIAL BUS(USB) - is the most common type of computer port used in today's computers. It can be used to connect keyboards, mice, game controllers, printers, scanners, digital cameras, and removable media drives, just to name a few. With the help of a few USB hubs, you can connect up to 127 peripherals to a single USB port and use them all at once (though that would require quite a bit of dexterity).

USB is also faster than older ports, such as serial and parallel ports. The USB 1.1 specification supports data transfer rates of up to 12Mb/sec and USB 2.0 has a maximum transfer rate of 480 Mbps. Though USB was introduced in 1997, the technology didn't really take off until the introduction of the Apple iMac (in late 1998) which used USB ports exclusively. It is somewhat ironic, considering USB was created and designed by Intel, Compaq, Digital, and IBM. Over the past few years, USB has become a widely-used cross-platform interface for both Macs and PCs.

Posted on Aug 16, 2008

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Posted on Jan 02, 2017

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How can i play videos from a USB with a Kenwood DDX715WBT i tried MPEG-2, WMV, DIVX, AVI, but it doesnt play it shows Unsupported File.


These excerpts from the user's manual....

USB
Connecting a USB device
You can connect a USB mass storage class device
such as a USB memory, Digital Audio Player etc. to
the unit.
• For details about connecting USB devices, see
page 70 .
• You cannot connect a computer or portable HDD
to the USB input terminal.
• For playable file types and notes on using USB
devices, see page 75.
When a USB device is connected...
The source changes to
"USB"
and playback starts.
• All tracks in the USB device will be played
repeatedly until you change the source.

[PAGE 75]

USB playback
Playable files on a USB device
• This unit can play the following types of files
stored in a USB mass storage class device.
- JPEG/BMP/PNG/MPEG1/MPEG2/MP3/WMA/
WAV/AAC/FLAC/H.264/WMV (VC-1)
• This unit can recognize a total of 5 000 files and
250 folders (a maximum of 999 files per folder).
• Make sure all important data has been backed up
to avoid losing the data.
Notes on using a USB device:
• This unit may not play back files in a USB device
properly when using a USB extension cable.
• USB devices equipped with special functions such
as data security functions cannot be used with the
unit.
• Do not use a USB device with 2 or more partitions.
• Depending on the shape of the USB devices and
connection ports, some USB devices may not be
attached properly or the connection might be
loose.
• This unit may not recognize a memory card
inserted into the USB card reader.
• When connecting with a USB cable, use the USB
2.0 cable.
The maximum number of characters (when the characters are 1 byte):
- Folder names: 128 characters
- File names: 128 characters
• Avoid using the USB device if it might affect
driving safety.
• Do not pull out and connect the USB device
repeatedly while "Reading" is shown on the
screen.
• Electrostatic shock at connecting a USB device
may cause abnormal playback of the device. In this
case, disconnect the USB device then reset this
unit and the USB device.
• Operation and power supply may not work as
intended for some USB devices.
• Do not leave a USB device in the car, or expose to
direct sunlight or high temperatures to prevent
deformation or damage to the device

Feb 12, 2016 | Kenwood Audio Players & Recorders

1 Answer

Is there a way to speed up the USB port on vr931nb


Hi Al
NO!
Fixed by the USB standards in use
USB 1.1, USB 2.0, USB 3 etc
Also the USB port on Computer
Attaching a USB 3 Drive to a USB 2 Computer Port will slow the device down to USB 2 standard

Sep 28, 2014 | Computers & Internet

1 Answer

I got a new transcend USB jetflash drive 16GB, but my system not showing any response towards it, what shall i do..??? is to download a software for it...??


Flash drives do not need a drivers (plug and play). There are several possibilities:

1. Assumptions: USB port error, computer drivers normal, normal flash drive.
Solution: insert a flash drive into another USB port. If the USB port 1 is not detected, insert flash drive into a USB 2, USB 3 or USB 4.
2. Assumption: normal USB ports, computer driver error, a normal flash drive
Solution: reinstall the chipset drivers, or USB.
3. Assumption: normal USB port,
computer driver normal, flash drive is broken
Solution: try to insert the flash drive into another computer. If the flash drive is not detected, it means your flash drive is damaged.

Solution to determine the cause of damage:
1. If you have a USB mouse, use the mouse to check the damage to the USB port. Example: connect the mouse to the USB 1, USB 2, USB 3 or USB 4. If every USB port, mouse is detected, the conclusion normal USB port
2. To check your computer's drivers, right-click My Computer - Properties - Hardware - Device Manager

10_13_2011_8_27_15_pm.jpg

3. If points 1 and 2 are normal, the possibility of flash drive damaged.
Because the new flash drive, flash drive is most likely normal. Based on experience, cause damage to the flash drive is a USB port is dirty. The USB port is dirty, can cause short-circuit flash drive. The characteristics of short-circuit flash drive. When inserted into a USB flash drive (about 5 seconds), the temperature of the flash drive become extremely hot. If there are problems like this, immediately unplug the flash drive, to prevent permanent damage.

I hope this information helps.

Oct 11, 2011 | Transcend 4GB JetFlash 110 USB 2.0 Flash...

1 Answer

Trying to connect HP Laserjet 2100 (works fine with XP) to Pavilion dv7 with Win7 64 bit Professional. I downloaded the PCL5 driver from HP but it will not print. I am using a Manhattan parallel to USB...


Did you download the Win 7 64 bit drivers for this printer. If not i suggest try downloading the drivers from the following link


http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=14914&pr...


Check the USB connection
The icon on the USB cable (c01424575.gif ) faces up when the cable connects to the product correctly. Check the back of your product and the back of your computer to make sure the USB cable connects correctly and securely.
After you make sure the USB cable connects correctly and securely, review the following guidelines to check other potential USB-related problems:

  • USB ports on the keyboard. USB ports on the keyboard and in the front of some computers might not be powerful enough to support the product. If the USB cable connects to the USB port on the keyboard, try connecting it to another available USB port on the computer.
  • USB cable length. HP supports USB cables less than 5 m (16 feet, 5 inches) long. However, a USB cable that is 5 m (16 feet 5 inches) long must be of high quality. Otherwise, HP recommends using a USB cable that is less than 2 m (3 feet, 3 inches). Do not use patch cables to increase the length of an existing cable. Use a powered USB hub if you need more length.
  • Alternate USB ports. Connect the USB cable to another port on the computer to make sure that the USB port on the computer is not the cause of the problem.
  • Defective USB cable. Replace the USB cable to make sure that the existing cable is not defective.
  • Conflicting USB ports. Disconnect any other USB printers, USB scanners, USB cameras, and any other USB connected peripherals. Start reconnecting these devices one at a time to determine if one of the devices is using too much power. Consider purchasing and installing a powered USB hub if necessary. NOTE: A USB-powered hub is a device that increases the number of available USB ports on a computer and facilitates communication between the USB devices and the computer. A powered USB hub can resolve communication failures between some, but not all, USB chipsets and HP products.

Jun 23, 2011 | HP LaserJet 2100 Printer

1 Answer

MY WEBCAM INTEX IT-305 WEB CAM IS NOT RECOGNIZED ON MY USB PORT EVEN AFTER INSTALLING THE DRIVER. ERROR ON CONNECTING IT TO USB PORT IS WINDOWS CANNOT RECOGNIZE THE DEVICE CONNECTED TO THE USB .


It sounds like you have a USB port(s) problem. Did you check them in Device Manager to see if they work ok? Did you try a different usb cable? You surely need Windows Service Packs installed in order to get USB 2.0 compatibility and speed. Without the service packs you will only get USB 1.1 compatibility and speed. But of course, the USB controller must be a USB 2.0 Controller before it can attain USB 2.0 compatibility and speed. There is no software that will make a USB 1.1 controller a USB 2.0 Controller. If your current USB controller is only 1.1 compatible, you will need to obtain a high speed USB 2.0 controller card or bus card. The easy way to tell if the current installed usb controller is 2.0 is to open Device Manager and click the + button next to USB Controllers. If you see the word "enhanced" anywhere beneath, then the controller is a USB 2.0 controller.

Sep 09, 2010 | Computers & Internet

3 Answers

What is the version of the usb port on a compaq presario 1200


Hi again, after extensively searching I believe your Laptop has a USB version 2.0.

Most PC's manufactured before 2001 were USB 1.0 and USB 1.1.

The Spec Guides for your PC indicate 2002 was the year of manufacture.

USB 2.0 is a faster USB connection than version 1.0 or 1.1. You might have trouble connecting devices that are USB 2.0 (which all new devices are now - since 2001).

To double check, use your Device Manager on the PC to look up the USB device and see what is written.

If you are using XP then do the following:

  1. Click Start
  2. Click Settings
  3. Click Control Panel
  4. In the Control Panel double-click the Systems icon.
  5. In the System Properties window click the Hardware tab.
  6. In the Hardware tab click the Device Manager button and you will see a list of devices.
  7. Click the + button next to the word the Universal Serial Bus controllers.
If it is USB 2.0 then it should say something like USB Enhanced or USB High Speed, this means it is USB 2.0 compatible.

I hope this helps. Please rate. Regards,

Feb 12, 2010 | Compaq Presario 1200 Notebook

1 Answer

I replaced the USB adapter chord and know there's not enough power to run the drive. I think I need a DC adapter, 5V, 1A, that fits the drive.


If you get an error message "Insufficient power to operate USB device" when you plug in a USB device into the computer's USB port then this device is drawing power that the USB port can supply.
In case such as this, you need to purchased a powered USB hub and connect this hub into the computer's USB port and then connect the USB device into this powered USB hub.

Dec 06, 2009 | SimpleTech SimpleDrive Portable USB 2.0...

1 Answer

USB taking too long to transfer vista


Note that USB ports (in your computer) and USB devices can either be "USB 1" or "USB 2" speeds.

While "USB 2" to "USB 2" connections are up to 480 Mbits/second,
any "USB 1" to "USB 2", or "USB 1" to "USB 1", connections,
will max-out at only 11 Mbits/second.

So, check that you have a "USB 2" device.
then check that you are connecting to a "USB 2" port on your computer.

Give more details about your computer, and your USB device.

Nov 04, 2009 | Microsoft Windows Vista Home Premium with...

1 Answer

Usb 1.1 & usb 2.0


USB 1.1 allowed a maximum transfer rate of 12Mbits/second. USB mice and keyboards need only 1.5Mbits/s to function. That performance level is also named 'USB'.
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.
You can use USB device with USB 1.0, USB 1.1 and USB 2.0 as long as your PC or laptop has USB ports, but USB 2.0 device transfer data at 480 Mbps on systems with USB 2.0 support only.

Apr 01, 2009 | Televison & Video

1 Answer

USB Drive


Make sure you are matching the compatibility of USB 1.1 and USB 2.0 between the devices (computer and USB devices).

USB 1.1 device will work in USB 1.1 and USB 2.0, but USB 2.0 devices will not work in USB 1.1 plug in the computer.

How many USB ports do you have in the computer? Which ones have you tried other pen drives in? List the USB ratings for each device and port in the computer to further help.

Have the other USB devices been formatted with other computers? The formatting on other systems might not be compatible.

Nov 21, 2007 | Microsoft Windows Vista Ultimate Edition

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