usb did not recognized..

[innoxious42]

what should i do when i insert my flashdrive it says that "usb did not recognized"

can someone help me..

thanks..

[N.C.]

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

[pcimage]

Could also be the oscillator.

[N.C.]

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

[innoxious42]

what software can i use for that??

[N.C.]

what software can i use for that??

hardware.... (first)

[innoxious42]

aw.. im sorry.. what can i do to that??

[pcimage]

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%.

[pcimage]

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!

[TheSlider]

Hi guys, maybe it's irrelevant but I am new at the field.
What is oscillators?

Thank you all!!

[N.C.]

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

[innoxious42]

so you mean to say its a hardware problem??

thanks for the advice..

[pcimage]

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!

[falther]

TheSlider,


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

[innoxious42]

is there a possible way to fix that??

[pcimage]

You can try to replace it, but it's a long shot.

[TheSlider]

TheSlider,


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

Sorry about the spam.

Thanks for the answer and for the link.

[innoxious42]

i think i have to buy a new one.. =(

[pcimage]

Er... yeah.

Assuming the data is worthless.

[innoxious42]

this is my flash drive..

what part do i have to replace??

Attachments