[dvd+rw-tools] "not an MMC unit", Philips PBDV1640P B3.2 and B2.5 via USB2

[/dev/null <devnull@fastwebnet.it>]

Hello.
	I have just purchased a Philips DVD writer which identifies
itself as "PBDV1640P" that growisofs reports as non MMC-compliant.

Since this DVD writer is a recent product, this seems strange.

Furthermore, the kernel says it is "sr0: scsi3-mmc drive: 40x/40x writer
cd/rw xa/form2 cdda tray".

I use the device via an IDE-to-USB2 external case. I don't know whether
that is relevant.

# growisofs -Z /dev/sr0 -R -J /my/files
:-( not an MMC unit!

(/dev/sr0 is a symlink to /dev/scd0)

When I plug the device into the USB port the kernel logs this:
Jan 28 17:28:10 sputnik kernel: usb 1-4: new high speed USB device using address 4 
Jan 28 17:28:10 sputnik kernel: scsi1 : SCSI emulation for USB Mass Storage devices 
Jan 28 17:28:11 sputnik kernel:   Vendor: PHILIPS   Model: PBDV1640P         Rev: B3.2 
Jan 28 17:28:11 sputnik kernel:   Type:   CD-ROM                             ANSI SCSI revision: 02 
Jan 28 17:28:11 sputnik kernel: USB Mass Storage device found at 4 
Jan 28 17:28:13 sputnik kernel: sr0: scsi3-mmc drive: 40x/40x writer cd/rw xa/form2 cdda tray 
Jan 28 17:28:13 sputnik kernel: Attached scsi CD-ROM sr0 at scsi1, channel 0, id 0, lun 0 

This problem happened with the older firmware release B2.5 as well.

I don't think it matters, but the device burns CDs correctly (via cdrecord).

Am I getting something wrong?

TIA,
/dev/null