HDD GURU FORUMS :: View topic - usb did not recognized..

Could also be the oscillator.

what software can i use for that??

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

N.C. wrote:

pcimage wrote:

Could also be the oscillator.

Sorry, but diasgree.

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

Author:	innoxious42 [ February 8th, 2010, 23:36 ]
Post subject:	usb did not recognized..
what should i do when i insert my flashdrive it says that "usb did not recognized" can someone help me.. thanks..

Author:	N.C. [ February 9th, 2010, 4:08 ]
Post subject:	Re: usb did not recognized..
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

Author:	pcimage [ February 9th, 2010, 4:13 ]
Post subject:	Re: usb did not recognized..
Could also be the oscillator.

Author:	N.C. [ February 9th, 2010, 4:21 ]
Post subject:	Re: usb did not recognized..
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

Author:	innoxious42 [ February 9th, 2010, 4:26 ]
Post subject:	Re: usb did not recognized..
what software can i use for that??

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Author:	N.C. [ February 9th, 2010, 4:27 ]
Post subject:	Re: usb did not recognized..
innoxious42 wrote: what software can i use for that?? hardware.... (first)

Author:	pcimage [ February 9th, 2010, 10:55 ]
Post subject:	Re: usb did not recognized..
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%.

Author:	pcimage [ February 9th, 2010, 11:23 ]
Post subject:	Re: usb did not recognized..
But we both agree that it's a hardware problem, right??? 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!

Author:	TheSlider [ February 9th, 2010, 12:01 ]
Post subject:	Re: usb did not recognized..
Hi guys, maybe it's irrelevant but I am new at the field. What is oscillators? Thank you all!!

Author:	N.C. [ February 9th, 2010, 18:25 ]
Post subject:	Re: usb did not recognized..
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%. 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

Author:	innoxious42 [ February 9th, 2010, 22:57 ]
Post subject:	Re: usb did not recognized..
so you mean to say its a hardware problem?? thanks for the advice..

Author:	pcimage [ February 10th, 2010, 4:18 ]
Post subject:	Re: usb did not recognized..
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!

Author:	falther [ February 10th, 2010, 4:32 ]
Post subject:	Re: usb did not recognized..
TheSlider, http://en.wikipedia.org/wiki/Crystal_oscillator

Author:	innoxious42 [ February 10th, 2010, 4:36 ]
Post subject:	Re: usb did not recognized..
is there a possible way to fix that??

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Author:	pcimage [ February 10th, 2010, 4:48 ]
Post subject:	Re: usb did not recognized..
You can try to replace it, but it's a long shot.

Author:	TheSlider [ February 10th, 2010, 13:06 ]
Post subject:	Re: usb did not recognized..
falther wrote: TheSlider, http://en.wikipedia.org/wiki/Crystal_oscillator Sorry about the spam. Thanks for the answer and for the link.

Author:	innoxious42 [ February 10th, 2010, 20:18 ]
Post subject:	Re: usb did not recognized..
i think i have to buy a new one.. =(

Author:	pcimage [ February 10th, 2010, 20:33 ]
Post subject:	Re: usb did not recognized..
Er... yeah. Assuming the data is worthless.