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+semantic: 0.445
+mistranslation: 0.350
+architecture: 0.346
+performance: 0.313
+device: 0.266
+PID: 0.249
+peripherals: 0.232
+user-level: 0.231
+kernel: 0.219
+socket: 0.216
+arm: 0.211
+permissions: 0.210
+hypervisor: 0.203
+graphic: 0.201
+debug: 0.173
+files: 0.165
+ppc: 0.151
+boot: 0.145
+register: 0.144
+network: 0.138
+virtual: 0.136
+i386: 0.128
+VMM: 0.127
+TCG: 0.110
+risc-v: 0.109
+vnc: 0.106
+x86: 0.097
+assembly: 0.092
+KVM: 0.065
+
+Unable to use USB as hda in Windows
+
+I built qemu 1.6.0 from source in MinGW (and all dependents not available with mingw-get) 
+The command line:
+qemu-system-i386.exe -m 1024 -hda \\.\PhysicalDrive1 -L pc-bios
+or
+qemu-system-x86_64.exe -m 1024 -hda \\.\PhysicalDrive1 -L pc-bios
+(or the *w.exe equivalents)
+reports in stderr.txt:
+qemu-system-i386.exe: -hda \\.\PhysicalDrive1: Block protocol 'host_device' doesn't support the option 'filename'
+qemu-system-i386.exe: -hda \\.\PhysicalDrive1: could not open disk image \\.\PhysicalDrive1: Invalid argument
+
+I have also found this bug in 1.5 but not in 1.4
+
+Some Help:
+The code in Qemu is a bit beyond me at 1am, but I was able to determine the root cause seems to be that block.c is becoming confused about referring to a file but not having a file name. I have been able to work around this by changing line 860 of block.c from:  "if (qdict_size(options) != 0) {" to "if (qdict_size(options) != 0 && !is_windows_drive(filename)) {"
+
+But I don't think this is a good solution (it is assuming that nothing else could be wrong), and I can't be sure that I'm not masking some real issue.
+
+FWIW; Build is on XP, but execution is on Win7.
+
+Thanks.
+
+I can confirm the same bug.  I am not building from source, but rather using the unofficial Windows binaries linked to by Qemu.
+
+http://wiki.qemu.org/Links
+
+I'm running as Administrator on Win8.1 x86_64
+
+qemu-system-i386.exe -L . -hda \\.\PhysicalDrive3
+
+qemu-system-i386.exe: -hda \\.\PhysicalDrive3: Block protocol 'host_device' doesn't support the option 'filename'
+qemu-system-i386.exe: -hda \\.\PhysicalDrive3: could not open disk image \\.\PhysicalDrive3: Invalid argument
+
+I see this error in the 1.51, 1.53, and 1.60 builds from a couple different sources
+
+PhysicalDrive3 is a USB device that's visible in the Windows Disk Management Snap-In.  I see the activity light on the drive blink when running this command.
+
+I've found some older Qemu binaries from various random sources https://code.google.com/p/kqemu-portable-win/ and they seem to be able to access physical devices without issue, though they also seem to have other problems of their own...
+
+I think this has been fixed by commit 68dc0364, which was included in
+qemu 1.7.0 and also backported to 1.6.1. Can you please try upgrading and
+confirm whether it fixes the problem?
+
+
+I found some newer Windows binaries at http://qemu.weilnetz.de/ and can confirm I do not see the issue any more.
+