On 15/04/2014, Mark C <[email protected]> wrote: > Yesterday I was backing up my main PC (Windows 7) onto a USB drive. By > 'backing up' I mean I was using MS SynchToy to synchronize a few folders > form the PC to those on the drive. The copy operation just froze, though > the computer ran fine. I disconnected and reconnected the drive, and > got a "USB Device Not Recognized Error" - and then the mouse and > keyboard stopped working. Disconnected the drive, powered off the PC, > powered up - it seemed to boot butthe screen was blank. Tried several > times - no audible post error codes, just a blank screen. I plugged the > the USB drive into the Linux (Lubuntu) machine and it worked perfectly. > OK - I figured the video card on the WIn& machine had died and someone > screwed up the USB on its way out (hey - to my mind that makes sense....) > > Several hours later and and after a lot of re-booting with no change to > the screen, I decided to disconnect the monitor and pull the video card, > planning to replace it today. I unpluged one monitor and on a whim hit > the power button - it booted fine, screen and all. Put on the second > montior, all was back to normal. The monitor cables were screwed in > tight - but unplugging one of them resolved the issue. > > Great - let's get back to backing up. Plugged in the USB drive and the > led on the drive started flickering and flashing like crazy. The > computer did not recognize the drive at all. Tried a few more times and > got a couple of USB Device Not Recognized errors that locked up the > computer. > > I booted the second machine into WIndows XP and found that the drive > worked, but very slowly - took 15-20 minutes to show up and then just > crawled. I figured the drive is toast. But then tonight I tried it again > in Linux. Worked just like normal. I copied the data on the drive to the > LInux machine - from my spot checks and looking at the the file sizes, > it seems to have copied over fine. From what I can see it is > uncorrupted and the copy was a fast as normal. > > I booted the LInux / WinXP machine back into XP and again the drive is > running super slow. I started a command line chkdsk /r 3 hours ago and > it is 50% through step 4 - verifying file data. > > Given that this works fine in linux but not windows - do you think that > might mean that the USB housing is defective and for some reason the > Linux USB drivers can somehow deal with it? If so - I could get a new > enclosure and move the drive. And why would a USB failure cause the > screen on the Win& PC to go blank and stay that until one monitor was > unplugged? Or is that just wicked coincidence?
I have a similar but mirrored problem. After unplugging a USB drive from my Linux box without ejecting or unmounting it, due to some glitch preventing me doing it properly, the drive is now not recognised by Linux. I can't remember the glitch precisely but it did involve a freeze. Taking it to work to try a reformat on Windows, I find it is recognised and all data present and correct. Different Linux machines - not recognised. Windows machines - fine. It's a paradox my skill level is unable to unravel but, by default, I blame Adobe. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
