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innoxious42
 Post subject: usb did not recognized..
PostPosted: February 8th, 2010, 23:36 
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Joined: October 27th, 2009, 4:50
Posts: 23
Location: philippines
what should i do when i insert my flashdrive it says that "usb did not recognized"

can someone help me..

thanks..
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N.C.
 Post subject: Re: usb did not recognized..
PostPosted: February 9th, 2010, 4:08 
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Joined: March 28th, 2008, 7:52
Posts: 1466
Location: Europe, Hungary
The internal flash content gets corrupted.
You need special equipment to read out the flash chip and than rebuild the data structure inside.

Seek for professional help, if you don't want to spend a lot of money for tools and knowledge...

Janos
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pcimage
 Post subject: Re: usb did not recognized..
PostPosted: February 9th, 2010, 4:13 
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Joined: November 29th, 2006, 10:08
Posts: 7864
Location: UK
Could also be the oscillator.

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N.C.
 Post subject: Re: usb did not recognized..
PostPosted: February 9th, 2010, 4:21 
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Location: Europe, Hungary
pcimage wrote:
Could also be the oscillator.


Sorry, but diasgree. :)
Without osc, the controller can't make USB link, so the windows can't sense at all something is plugger in or not.
So, if the windows says the device is unknown, usually the flash content is corrupted of flash chip is dead.

Janos
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innoxious42
 Post subject: Re: usb did not recognized..
PostPosted: February 9th, 2010, 4:26 
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Joined: October 27th, 2009, 4:50
Posts: 23
Location: philippines
what software can i use for that??
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N.C.
 Post subject: Re: usb did not recognized..
PostPosted: February 9th, 2010, 4:27 
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Location: Europe, Hungary
innoxious42 wrote:
what software can i use for that??


hardware.... (first)
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innoxious42
 Post subject: Re: usb did not recognized..
PostPosted: February 9th, 2010, 4:36 
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Joined: October 27th, 2009, 4:50
Posts: 23
Location: philippines
aw.. im sorry.. what can i do to that??
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pcimage
 Post subject: Re: usb did not recognized..
PostPosted: February 9th, 2010, 10:55 
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Joined: November 29th, 2006, 10:08
Posts: 7864
Location: UK
N.C. wrote:
pcimage wrote:
Could also be the oscillator.


Sorry, but diasgree. :)
Without osc, the controller can't make USB link, so the windows can't sense at all something is plugger in or not.
So, if the windows says the device is unknown, usually the flash content is corrupted of flash chip is dead.

Janos


Sorry Janos, but I disagree with you :-)

Many times (maybe 6 or more) I have had USB drives with suspect oscillators and the device unseen by the PC at all, but if I put my finger across the oscilator connections the device was recognosed by windows but as "USB device not recognised". An oscillator change has fixed it many times.

In fact, this was the case with the 16Gb unbranded flash drive I have here in my hand that I use every day for temporary data transfer. With my finger over the oscillator connections (from the other side of the PCB) it was detected as something but "USB device not recognised". With a working oscillator, it's working 100%.

:mrgreen:

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pcimage
 Post subject: Re: usb did not recognized..
PostPosted: February 9th, 2010, 11:23 
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Joined: November 29th, 2006, 10:08
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Location: UK
But we both agree that it's a hardware problem, right??? :P

It's more likely to be bad cells in the flash like you say, but I just mentioned that it "could" be the oscillator too!

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TheSlider
 Post subject: Re: usb did not recognized..
PostPosted: February 9th, 2010, 12:01 
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Joined: January 31st, 2010, 18:00
Posts: 36
Location: TheSlider
Hi guys, maybe it's irrelevant but I am new at the field.
What is oscillators?

Thank you all!!
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N.C.
 Post subject: Re: usb did not recognized..
PostPosted: February 9th, 2010, 18:25 
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Joined: March 28th, 2008, 7:52
Posts: 1466
Location: Europe, Hungary
pcimage wrote:
N.C. wrote:
pcimage wrote:
Could also be the oscillator.


Sorry, but diasgree. :)
Without osc, the controller can't make USB link, so the windows can't sense at all something is plugger in or not.
So, if the windows says the device is unknown, usually the flash content is corrupted of flash chip is dead.

Janos


Sorry Janos, but I disagree with you :-)

Many times (maybe 6 or more) I have had USB drives with suspect oscillators and the device unseen by the PC at all, but if I put my finger across the oscilator connections the device was recognosed by windows but as "USB device not recognised". An oscillator change has fixed it many times.

In fact, this was the case with the 16Gb unbranded flash drive I have here in my hand that I use every day for temporary data transfer. With my finger over the oscillator connections (from the other side of the PCB) it was detected as something but "USB device not recognised". With a working oscillator, it's working 100%.

:mrgreen:


In this case i agree, bad connection, broken X-tal can make this issue, because if you touch it, the frequency is close to normal, the win senses the USB link, but the communication is unstable, and this is why unknown device shown.

But basically, without a good oscillator, the drive don't makes any sense at all, right? :)

Yes, agree, this is hw problem.

Janos
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innoxious42
 Post subject: Re: usb did not recognized..
PostPosted: February 9th, 2010, 22:57 
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Joined: October 27th, 2009, 4:50
Posts: 23
Location: philippines
so you mean to say its a hardware problem??

thanks for the advice..
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pcimage
 Post subject: Re: usb did not recognized..
PostPosted: February 10th, 2010, 4:18 
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Joined: November 29th, 2006, 10:08
Posts: 7864
Location: UK
N.C. wrote:
In this case i agree, bad connection, broken X-tal can make this issue, because if you touch it, the frequency is close to normal, the win senses the USB link, but the communication is unstable, and this is why unknown device shown.

But basically, without a good oscillator, the drive don't makes any sense at all, right? :)

Yes, agree, this is hw problem.

Janos


Exactly right, now we're singing from the same hymn sheet! :)

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falther
 Post subject: Re: usb did not recognized..
PostPosted: February 10th, 2010, 4:32 
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Joined: September 2nd, 2008, 12:14
Posts: 447
Location: Austria / Europe
TheSlider,


http://en.wikipedia.org/wiki/Crystal_oscillator
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innoxious42
 Post subject: Re: usb did not recognized..
PostPosted: February 10th, 2010, 4:36 
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Joined: October 27th, 2009, 4:50
Posts: 23
Location: philippines
is there a possible way to fix that??
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pcimage
 Post subject: Re: usb did not recognized..
PostPosted: February 10th, 2010, 4:48 
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Joined: November 29th, 2006, 10:08
Posts: 7864
Location: UK
You can try to replace it, but it's a long shot.

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TheSlider
 Post subject: Re: usb did not recognized..
PostPosted: February 10th, 2010, 13:06 
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Joined: January 31st, 2010, 18:00
Posts: 36
Location: TheSlider
falther wrote:
TheSlider,


http://en.wikipedia.org/wiki/Crystal_oscillator



Sorry about the spam.

Thanks for the answer and for the link. :)
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innoxious42
 Post subject: Re: usb did not recognized..
PostPosted: February 10th, 2010, 20:18 
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Joined: October 27th, 2009, 4:50
Posts: 23
Location: philippines
i think i have to buy a new one.. =(
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pcimage
 Post subject: Re: usb did not recognized..
PostPosted: February 10th, 2010, 20:33 
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Joined: November 29th, 2006, 10:08
Posts: 7864
Location: UK
Er... yeah.

Assuming the data is worthless.

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innoxious42
 Post subject: Re: usb did not recognized..
PostPosted: February 10th, 2010, 22:07 
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Joined: October 27th, 2009, 4:50
Posts: 23
Location: philippines
this is my flash drive..

Attachment:
IMG_1489.JPG
IMG_1489.JPG [ 564.24 KiB | Viewed 20588 times ]


what part do i have to replace??


Attachments:
IMG_1490.JPG
IMG_1490.JPG [ 666.8 KiB | Viewed 20588 times ]
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