On Mon, 29 Dec 2008, Andrew Hoog wrote: > Good morning, > > For some time, I've tried to figure out how to treat the virtual > CD-ROM on a U3 drive as a direct-access device (SCSI type 0) instead > of a read-only direct-access device (SCSI cd-rom, type 5) In theory this is possible. In practice, what makes you think the device will work when you send it disk-type commands instead of the CD-ROM-type commands it expects? > so that > users can overwrite the data in that area and use as they wish. There > is quite a bit of discussion on the web about this device however most > centers around removing the "partition" or hiding it in Linux (the > autorun and .exe on the CD-ROM are for Windows only). > > I've posted my analysis to date at > http://chicago-ediscovery.com/computer-forensic-howtos/forensic-acquisition-analysis-u3-usb-drive.html > which is focused on the forensics side. There is a U3 removal utility > as well as a program (Universal Customizer) that will overwrite the > iso9660 filesystem (in Windows) using a .dll supplied by the U3 group > (u3dapi10.dll). However, I would like to be able to accomplish this > in Linux using standard utilities. Your best bet is to reverse engineer the Universal Customizer program, say by using a program like SnoopyPro to see what commands it sends to the device. Then you can figure out how to send the equivalent data yourself in Linux. > I've looked into udev rules but I cannot find a way to change the > device driver. Also, I tried the sg3_utils but sg_dd on the generic > device fails (device not ready (w)) as it still just sees a read-only > CD-ROM. Does anyone have advise on how to change the device driver > for the endpoint from "sr" to "sd"? The only way is to fool the kernel into thinking the device is Type 0 instead of Type 5. You would have to hack the kernel, which probably is not what you had in mind. > Is there a better work around? > Thank you. If you don't like the reverse-engineering approach, you can use programs like sg-utils to send your own WRITE commands to the device. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
