045e:ffff — Windows CE Mass Storage

This is the USB identifier for a Windows CE Mass Storage manufactured by Microsoft Corp.. The vendor ID 045e is registered to Microsoft Corp. with the USB Implementers Forum, and ffff is the product ID that Microsoft Corp. assigned to this particular model. When you run lsusb on Linux, this device appears as 045e:ffff Microsoft Corp. Windows CE Mass Storage.

Linux

$ lsusb
Bus 001 Device 004: ID 045e:ffff Microsoft Corp. Windows CE Mass Storage

You can filter directly with lsusb -d 045e:ffff, or get the full descriptor dump with lsusb -v -d 045e:ffff. Kernel messages from dmesg show the same pair as idVendor=045e, idProduct=ffff.

Windows

In Device Manager, open the device, go to Details → Hardware Ids. This device reports:

USB\VID_045E&PID_FFFF
USB\VID_045E&PID_FFFF&REV_0100

From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_045E&PID_FFFF"

macOS

$ system_profiler SPUSBDataType
    Windows CE Mass Storage:
      Product ID: 0xffff
      Vendor ID: 0x045e  (Microsoft Corp.)

Having driver issues with this device? Most USB devices are handled by a generic class driver; if yours shows up as an unknown device, confirm the ID above first, then check the manufacturer's downloads page. Microsoft Corp. official support →

The exact lines this page is generated from, in the upstream source file:

045e  Microsoft Corp.
	ffff  Windows CE Mass Storage

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• 045e:930a ISOUSB.SYS Intel 82930 Isochronous IO Test Board
• 045e:ffca Catalina
• 045e:fff8 Keyboard

See all 324 devices from Microsoft Corp. →