USB flash drive not seen by file managers at start up

Here you go...

This basically means that the Windows USB driver reported some error communicating with the device and couldn't even get the descriptor.

Unfortunately, I haven't found any documentation from MS about what exactly the CM_PROB_FAILED_POST_START error means during this phase.

Since it looks like your USB controller drivers are up to date and this only happens with one device, I'd say it's a device problem. Does this happen if you plug in the USB drive into another computer?

Code:

        +++++++++++++++++ Device Information ++++++++++++++++++
Device Description       : Unknown USB Device (Set Address Failed)
Device Path              : \\.\usb#vid_0000&pid_0004#5&326c0cbc&0&17#{a5dcbf10-6530-11d2-901f-00c04fb951ed}
Device ID                : USB\VID_0000&PID_0004\5&326C0CBC&0&17
Hardware IDs             : USB\SET_ADDRESS_FAILURE
Driver KeyName           : {36fc9e60-c465-11cf-8056-444553540000}\0027 (GUID_DEVCLASS_USB)
Driver Inf               : C:\WINDOWS\inf\usb.inf
Legacy BusType           : PNPBus
Class                    : USB
Class GUID               : {36fc9e60-c465-11cf-8056-444553540000} (GUID_DEVCLASS_USB)
Interface GUID           : {a5dcbf10-6530-11d2-901f-00c04fb951ed} (GUID_DEVINTERFACE_USB_DEVICE)
Enumerator               : USB
Location Info            : Port_#0017.Hub_#0004
Manufacturer Info        : (Standard USB Host Controller)
Capabilities             : 0x64 (Removable, SilentInstall, RawDeviceOK)
Status                   : 0x01806400 (DN_HAS_PROBLEM, DN_DISABLEABLE, DN_REMOVABLE, DN_NT_ENUMERATOR, DN_NT_DRIVER)
Problem Code             : 43 (CM_PROB_FAILED_POST_START)
Address                  : 17
Power State              : D3 (supported: D0, D3, wake from D0)

        ---------------- Connection Information ---------------
Connection Index         : 0x11 (17)
Connection Status        : 0x02 (DeviceFailedEnumeration)
Current Config Value     : 0x00
Device Address           : 0x00 (0)
Is Hub                   : 0x00 (no)
Number Of Open Pipes     : 0x00 (0)
Device Bus Speed         : 0x02 (High-Speed) -> not true, see below in Connection Information V2

Also, I notice that port 15 has some error (indicated by yellow bangs in usbtreeview). It's there in both the good and bad cases so I don't think it's related to the flash drive issue, but do you have some device plugged into that port?

Code:

    =========================== USB Port15 ===========================

Connection Status        : 0x03 (Device general failure)
Port Chain               : 3-15

      ======================== USB Device ========================

DriverKeyName            : ERROR_INVALID_PARAMETER

        ---------------- Connection Information ---------------
Connection Index         : 0x00 (0)
Connection Status        : 0x03 (DeviceGeneralFailure)
Current Config Value     : 0x00
Device Address           : 0x00 (0)
Is Hub                   : 0x00 (no)
Number Of Open Pipes     : 0x00 (0)
Device Bus Speed         : 0x00 (Low-Speed)

    ---------------------- Device Descriptor ----------------------
bLength                  : 0x00 (0 bytes)

      -------------------- String Descriptors -------------------
none