Re: Questions on USB Handling

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

> 1. ... there is an error condition with code 14.

14 means your computer needs to be restarted before the driver can work.

> 2. ... If two USB mass storage devices, both do not have serial number in
> their
> device descriptor, are plugged into a computer

I believe the USB mass storage spec requires disks to have a serial number.

> 3. Same as above but this time both USB mass storage devices have the same
> serial numbers.

XP (and 2K) will not enumerate the second device properly, if at all

Marc Reinig
System Solutions

"George" <georgeyu@xxxxxxxxxxxxxxxx> wrote in message
news:udM7sqtpFHA.1996@xxxxxxxxxxxxxxxxxxxxxxx
> Hi All,
>
> I have a few questions regarding the Windows' handling of USB mass storage
> devices.
> 1. Sometimes when I plug multiple USB mass storage devices into a
> computer, one of them will be inoperable. From the Safely Remove Hardware
> dialog box, the text for the inoperable device is Mass Storage Device and
> it
> has a yellow question mark and a small yellow exclamation mark. When I
> check
> further, it indicates there is an error condition with code 14. Could
> anyone
> please tell me what causes this condition? The fact that the text "Mass
> Storage Device" is shown indicates some low level handshakings were
> successful. I just wonder at which step the USB plug and play procedure
> went
> south.
> 2. If two USB mass storage devices, both do not have serial number in
> their
> device descriptor, are pluged into a computer. How does the Windows tell
> which is which? will this cause problem?
> 3. Same as above but this time both USB mass storage devices have the same
> serial numbers. Will this cause the Windows to not function properly in
> terms of USB devices' identification and handling?
>
> Any help on these subjects are greatly appreciated.
>
> Best regards,
> George
>
>


.

Relevant Pages

  • Re: USB mass storage lockout needed
    ... (which is a system folder - you need to change your folder options to see ... I need to find a way to lock out USB mass storage devices from multiple ... these files but windows just replaces them within a few seconds. ...
    (microsoft.public.win2000.security)
  • Another Question on USB Mass Storage Device handling
    ... I have more questions on Windows' handling of USB mass storage device: ... If two USB mass storage devices, both do not have serial number in their ...
    (microsoft.public.win2000.developer)
  • Questions on USB Handling
    ... I have a few questions regarding the Windows' handling of USB mass storage ... Sometimes when I plug multiple USB mass storage devices into a ... If two USB mass storage devices, both do not have serial number in their ...
    (microsoft.public.win32.programmer.kernel)
  • USB card reader - how do I mount it?
    ... The card reader is a PNY multi card reader ... Initializing USB Mass Storage driver... ... SCSI emulation for USB Mass Storage devices ...
    (comp.os.linux.hardware)
  • Re: USB Mass storage driver problem
    ... I expect there are still issues with certain USB mass storage devices, ... I want to ask if a problem with USB mass storage driver in Win CE 5.0 ...
    (microsoft.public.windowsce.platbuilder)