USB Device not recognized...has malfunctioned

Sandisk 1gb cruzer mini usb flash drive
January 20, 2010 at 12:47:43
Specs: Windows 7
This flash drive was working on my new computer with windows 7. Now when I insert the drive I get the message "USB device not recognized. The device has malfunctioned and windows does not recognize it. Anything I can do to save the data on this drive?

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January 20, 2010 at 13:19:12
You commonly get a message like that when the USB device you're plugging in can't get a good enough connection in the USB port you have it plugged into.

USB devices may not work correctly when they're connected to certain USB ports e.g. ports in a hub or on the front of a desktop case. If you have a desktop computer, you may have an IRQ sharing problem you need to fix, or your power supply may be starting to fail.
See response 3 in this:

Also - if you are using a USB extension cable, some of them have inadequate wiring and will not work properly with some USB devices.

If the flash drive is being detected correctly but it does not show up in My Computer or Windows Explorer, that's a different matter.
In that case, the data on it is damaged - that can often be fixed with third party programs, if the flash drive is okay otherwise.

If it's being detected correctly as a hardware device, it shows up in Device Manager and in Disk Management.

E.g. - I'm assuming it's the same thing as in Vista.

RIGHT click on Computer - Properties - Device Manager. Under Disk Drives it should show up - e.g. Sandisk Cruzer or similar in this case.
Under USB controllers - there should be a USB Mass Storage Device entry for it
- in the Properties of one of the Root Hubs - Power tab - there should be a USB Mass Storage Device - xxxma

Control Panel - Administrative Tools - Computer Management - Disk Management
It should show up as a removable drive of the right capacity, in this case labelled Sandisk or similar.

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January 21, 2010 at 09:10:58
Thanks for the reply. It doesn't look like it's detecting the device. When I look in the device manager under USB controllers, I see a yellow flag with an exclamation mark in the middle next to "Unknown Device".

If it's a connection problem, is there anything I can do to enhance the connection?

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January 21, 2010 at 15:43:35
- make sure you have it plugged into a USB port it should work fine in
- if no USB device works, or only some USB devices work, if this is a desktop, make sure the PS is putting out 5v, within 10%
- if this is a desktop computer, see the info about checking for an IRQ sharing problem

as in the info in the first link in response 1

Much less likely - look for physical damage -

Examine the USB plug on the drive, and the USB port you're plugging into. Look for bent contacts, or a missing plastic blocking plug. If the plug isn't there, the drive can be plugged in upside down, and doing so may fry the drive and possibly the USB circuits. Bent contacts may fry either too, when the drive is plugged in.

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April 3, 2010 at 17:51:01
I have the same issue except my problem is with my microsoft wireless optical mouse it has malfunctioned it's work for over a year until one day I pulled the usb out and it said that code 43 please help me fix this.

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April 3, 2010 at 22:17:03

Code 43: Windows has stopped this device because it has reported problems

A device driver notified the operating system that the device failed.

For more information about how to diagnose the problem, see the hardware documentation.

If you get the message only when the wireless receiver / transmitter for the mouse is plugged in......

See the second paragraph in Response 1 - the wireless receiver / transmitter for the mouse must be plugged into a USB port it can work properly with.

- wireless mice always use batteries - are you sure they're still okay ? Have you changed them since you got the mouse? You probably should have. They don't last forever.

- wireless mice often have a tiny switch on them - you switch it off when you aren't using the mouse to conserve battery life - if yours has one, is it switched on ?

- when you have unplugged the wireless receiver / transmitter, the next time you plug it in you may need to press a switch on the mouse or do something to activate the wireless mouse.
See the installation instructions.

- unlikely - you may need to un-install the drivers / software for the wireless mouse, install it again. In many cases you do not plug in the wireless receiver / transmitter for the mouse until the software has been installed. See the installation instructions.

- you may not be able to move the mouse cursor after you have un-installed the software for the wireless mouse then installed it again, when you boot the first time, until the desktop has fully loaded and Windows installs the drivers for the mouse. If you need to Logon while booting, use the Tab key to toggle which thing on the screen is active (highlighted or dots around it) press Enter, or type the password, press Enter - you may need to use cursor keys as well.

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