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Most MTP (Media Transfer Protocol) devices in show up in Windows Explorer under their device name or a GUID, but don't have a drive letter assigned.

How can I access the files on such devices from the command line. Using either cmd.exe or Powershell.

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The fact that the Linux MTP compatible implementations such as gphoto2 have a way to script uploading suggests that this should be possible on Windows somehow, assuming that Windows Media Player doesn't somehow block any other software from accessing the USB MTP interface... I too would like to know if this is possible. – Mokubai Dec 20 '11 at 22:00
I gave up trying to find a solution for this with my Android MTP device and ended up installing a WebDAV server on my device. This could be mounted as a network drive, albeit slowly. – Mark Booth Oct 14 '12 at 13:25
WebDAV...ugh... That's painful. It would work decently enough though. It' me that Windows can't seem to manage what Linux does out of box effortlessly. Oh, well. – Svartalf May 9 '14 at 19:57
up vote 18 down vote accepted

Unfortunately, APIs exposed by MTP are very different from a normal filesystem APIs. Therefore exposing MTP device as a read/write filesystem is not possible. The main reason:

Wikipedia says:

Neither the MTP nor the PTP standards allow for direct modification of objects. Instead, modified objects must be reuploaded in their entirety, which can take a long time for large objects. With PTP/MTP, the file size must be known at the opening stage.

Your common file copy program just opens a source and a target file, and copies data in chunks from the source file to the target. This won't work with MTP, since you need to use MTP special functions, and generic filesystem primitives (read, seek, write) are not available.

There are also other limitations. For example, the number of files that can be read or written simultaneously on an MTP device is severely limited. The device simply does not behave like a filesystem.

I suppose read-only filesystem driver for an MTP device might be possible, but because of the problems outlined above, it will be of very little use, so nobody bothered to create it.

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The read-only filesystem driver seems to exist now: – Arne de Bruijn Sep 12 '13 at 12:25
Actually, it's not "not possible". When you consider that I've got gphotofs and mtpfs as FUSE filesystems on Linux that're COMPLETELY Read/Write- its' quite possible to accomplish this as a "drive letter" under Windows...they've just not made it available or easy. – Svartalf May 9 '14 at 19:57

You may be able to cobble something together with the MTP porting kit's MTPMon.

Alternatively, PowerShell can create COM objects and call their methods, so you may be able to use the APIs that Windows Explorer is using (for example, GetDeviceInfo() and GetObjectInfo()).

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