On Jun 23, 8:03*am, Paul <nos...@needed.com> wrote:
> Roy wrote:
> > On Jun 22, 6:50 pm, Paul <nos...@needed.com> wrote:
> >> Roy wrote:
> >>> On Jun 22, 4:04 pm, Paul <nos...@needed.com> wrote:
> >>>> Roy wrote:
> >>>>> Hello group
> >>>>> Recently I *was dismayed why my USB drive was not recognized anymore
> >>>>> by window explorer. Therefore if I *plug it on the USB slot it does
> >>>>> nothing. I searched the web for some ideas and came from this fellow
> >>>>> which states:\
> >>>>> 'A user of a company I know recently told me the following experience
> >>>>> he had with a USB flash drive. The user traveled a lot and had a
> >>>>> laptop that he used to connect to the company's network when he wasin
> >>>>> the office. And he was used to plugging his flash drive into the USB
> >>>>> slot on his laptop so he could transfer files to another machine he
> >>>>> used at home. But one day he came into the office, connected his
> >>>>> laptop to the network, plugged in the flash drive and nothing happened
> >>>>> -- normally an Explorer window would open displaying the contents of
> >>>>> the drive. This was disconcerting, so he opened My Computer and
> >>>>> discovered that the USB drive wasn't there. Puzzled by this, he took
> >>>>> out another flash drive from his pocket and tried it, and this timeit
> >>>>> worked fine so he knew at least the problem wasn't with his computer.
> >>>>> He was just about resigned to throwing out his first drive when he
> >>>>> decided to send me a quick email detailing the problem. My immediate
> >>>>> reaction too was that it was that the drive had failed, but then I
> >>>>> thought about it some more. One of the key steps in troubleshooting
> >>>>> problems is to ask what just happened. The drive failure had occurred
> >>>>> after he connected his machine to the network, so could it be an issue
> >>>>> with the network? I emailed back and suggested he disconnect his
> >>>>> laptop from the network and try the flash drive again, and a short
> >>>>> time later I received an email saying the drive now worked!
> >>>>> Then it dawned on me. I told him to remove the drive, connect to the
> >>>>> network and open My Computer again and look for something different..
> >>>>> He did this and told me there was a new mapped network drive that he
> >>>>> hadn't seen before. Aha! The network administrator must have modified
> >>>>> their logon script to map a new drive on users' computers, and this
> >>>>> new mapped drive probably assigned the very same drive letter that
> >>>>> this particular user's laptop had previously assigned to his first USB
> >>>>> drive. I told him to plug the USB drive in again, open Computer
> >>>>> Management, and change the drive letter of the USB drive. He did this,
> >>>>> and right away an Explorer window opened displaying the contents of
> >>>>> his USB drive. Problem solved'
> >>>>> Since I have never done such things these ideas sound strange to me..
> >>>>> Meaning if the drive is malfunctioning it might have something to do
> >>>>> with such and not a hardware fault.
> >>>>> Although I was not using a laptop but just a desktop PC.
> >>>>> I did found the computer management ( local) and had viewed the disk
> >>>>> management on the right pane.
> >>>>> Indeed there are letters that indicates one drive say for example
> >>>>> Drive D and drive C which is easier tounderstand as well asthe Drive E
> >>>>> and F *and so forth. Previously the Flash drive was recognized as
> >>>>> Drive G and J as well as drive H for *another External hard drive..
> >>>>> But now it does not recognized my flash drive.
> >>>>> What I don't understand is why window explorer does not recognize my
> >>>>> USB flash drive but still do with the other drives.
> >>>>> Early this morning I was plugging these drives to the networked
> >>>>> computer in the internet cafe and immediately it was not recognized
> >>>>> and this kept me worried so when I arrived home I immediately plugged
> >>>>> it and there the flash drive is not functioning or being recognized
> >>>>> anymore.
> >>>>> Could somebody offer me their advice how to sort this out
> >>>>> What is going on?
> >>>>> TIA
> >>>>> Roy
> >>>> Uwe Sieber has a web site, with that kind of information on it.
> >>>>http://www.uwe-sieber.de/usbtrouble_e.html
> >>>> *From a hardware perspective, you can verify that the plugged in
> >>>> device is being detected (communicated with), via UVCView program
> >>>> from Microsoft. (Use the upper right hand link, to download an
> >>>> executable for Windows 32 bit OS.) This is an archived web page,
> >>>> as Microsoft has taken down the download page. There have been
> >>>> several versions of programs that look like this one, and so far,
> >>>> this one is the most capable. (Some of the originals, had limits
> >>>> on the number of ports they could handle.)
> >>>>http://web.archive.org/web/200705160...crosoft.com/wh....
> >>>> If the physical layer is working, and the USB device can be
> >>>> enumerated, and fill the window with data, then the problem
> >>>> must be at a higher level in software. (In the picture here,
> >>>> you can see VID/PID 0x0ECD 0xA100 device has been detected, and
> >>>> the presence of the Endpoint Descriptor presumably means a
> >>>> communications path is set up.)
> >>>>http://www.die.de/blog/content/binary/usbview.png
> >>>> For resetting the USB stack, usbman.com has a page describing a
> >>>> procedure to do in safe mode. But this doesn't necessarily fix
> >>>> everything. There are also instances where a driver cache is
> >>>> corrupted, or the registry is locked to updates, that might
> >>>> cause a procedure like this to not fix anything. But in those
> >>>> cases, searching on the exact error text, will likely lead you
> >>>> in the right direction.
> >>>>http://www.usbman.com/Guides/Cleanup...%20Safe%20Mode....
> >>>> HTH,
> >>>> * * *Paul- Hide quoted text -
> >>>> - Show quoted text -
> >>> Thanks !. sounds complicated and Microsoft is cautious about
> >>> installing hotfixes which may not be the solution to the problem
> >>> I did try to follow a certain procedure
> >>>http://www.port-huron.k12.mi.us/tech...bflashdrivetro....
> >>> But it when I right my computer- choose manage- Storage- disk
> >>> management
> >>> Then I right clicked the listed removable disk then change drive
> >>> letter and paths
> >>> And want to assign a new drive letter.
> >>> I was given a warning that *changing the drive letter might cause
> >>> problem that the hardware connected might no longer run so *stopped
> >>> there.
> >>> I also tried to create another drive letter but it says the letter was
> >>> not recognized.
> >>> Creating a new folder *needs that you need another path, but when I
> >>> browsed I only find that there are two path- the C and D drive.
> >>> So I got lost here and would need some suggestion from people that are
> >>> familiar with this methods.
> >>> Thank You!
> >> Have a look at this page. The Drive Letter Manager
> >> might be able to change a USB drive letter for you.
> >> I haven't used it, because I don't have any USB flash
> >> devices here.
>
> >>http://www.uwe-sieber.de/usbdlm_e.html
>
> >> * * Paul- Hide quoted text -
>
> >> - Show quoted text -
>
> > Thanks, I will have to read first the literature about its use.
> > BTW, is there anybody here have experience about USB drive
> > overvoltage? What I mean I am not discounting the fact that the
> > desktopPc might have fried circuitry *and this is an additional worry
> > for me. I was thinking that *some computers might have higher USB
> > voltage rating for USBs than laptops?
> > Is there a likelihood for such to happen?
> > I just hope that this hardware is still intact...
>
> The USB connector consists of +5V, GND, D+, and D-. Two power
> signals and two data signals. The power level is a standard, whether
> desktop or laptop. A high power device may draw up to 500mA of
> current, and the total maximum power of 2.5 watts is just enough
> to operate a modern 2.5" hard drive.
>
> A USB device can be damaged by handling, such as dropped and broken.
> Or static discharge could damage a device. But the
> operating voltage should be the same on each computer. And
> the connectors seem to be well designed, at least compared to
> some more problematic connectors (Firewire).
>
> The reason I wanted you to use UVCView, is to see if any low
> level communication was happening or not. If there are no
> endpoints and no enumeration data being shown, for a plugged
> in USB device, it could be a hardware issue. If the right hand
> window in UVCView has data in it, then there is hope that the
> USB device is not completely dead.
>
> The foreign computer could also have malware or a virus on it,
> and a software like that might erase the flash device. I suppose
> a device could be "killed" by being reconfigured, but I don't understand
> how those tools work. It is possible to change the declared size
> of a USB flash device (fraudsters on Ebay do that), so there is
> some kind of interface to USB flash sticks, that hackers understand.
>
> The only "frying" I've heard of, is Intel ICH5/ICH5R Southbridge
> chips, can have their USB ports fail. When that happens, all the
> USB ports on the computer, fail to operate. No plugged in device
> will be recognized at all. You would not see any activity in UVCView.
> In extreme cases, there will be a burn mark on the Southbridge chip on the
> motherboard. But many of the ones reported to have
> failed, don't have the burn mark - and that is good, because
> if the chip is not burned by the failure, the computer
> continues to be bootable. When it burns, it is finished, and
> won't boot again. (I get to worry about this, because I have
> that chip on my motherboard :-) )
>
> * * Paul- Hide quoted text -
>
> - Show quoted text -

Hello Paul...sorry for the delay, been very busy the last several days
to visit newsgroups. I did try to download the UVC view.x86.exe. but
never been able to finish downloading this file as it tends to hang up
when its about 65-77% of the program has been downloaded. And it
cannot be refreshed either as it just start from the beginning. I have
done this so many times....but failed.
Therefore I can't evaluate my USB drive.
Is there any mirror for these site?
BTW, I was starting to think about the efffect of static electricity
on some computer hardware and got worried that this particular flash
drive got it.
The PC that I plugged my USB ( i found out later was home built). What
is your opinion on this?
Thanks
Roy