Context : My application writes data in USB ,CD & DVD. I am using RegisterDeviceNotification for detect device changes.To ensure that connected device is USB based storage device i am using DeviceIoControl api.
Problem : Now i need to identify Storage devices in USB devices. During testing i found USB based CD/DVD were also detected by logic as USB mass storage device. I added check for Device Type. But i don't see any device type in SCSI for USB mass storage.
Please suggest me a good solution to uniquely identify a USB Mass storage device.
bool IsUsbStorageDevice( wchar_t letter )
{
wchar_t volumeAccessPath[] = L"\\\\.\\X:";
volumeAccessPath[4] = letter;
HANDLE deviceHandle = CreateFileW(
volumeAccessPath,
0, // no access to the drive
FILE_SHARE_READ | // share mode
FILE_SHARE_WRITE,
NULL, // default security attributes
OPEN_EXISTING, // disposition
0, // file attributes
NULL); // do not copy file attributes
// setup query
STORAGE_PROPERTY_QUERY query;
memset(&query, 0, sizeof(query));
query.PropertyId = StorageDeviceProperty;
query.QueryType = PropertyStandardQuery;
// issue query
DWORD bytes;
STORAGE_DEVICE_DESCRIPTOR devd;
STORAGE_BUS_TYPE busType = BusTypeUnknown;
bool usbcdrom = false;
if (DeviceIoControl(deviceHandle,
IOCTL_STORAGE_QUERY_PROPERTY,
&query, sizeof(query),
&devd, sizeof(devd),
&bytes, NULL))
{
busType = devd.BusType;
usbcdrom = devd.DeviceType == 0x005;
}
CloseHandle(deviceHandle);
return (BusTypeUsb == busType) && !usbcdrom;
}
You must use L"\\\\\\\\.\\\\PhysicalDriveN" instead of L"\\\\\\\\.\\\\X:"
where you change N from 0 to 29:
PhysicalDrive0
PhysicalDrive1
...
PhysicalDrive29
GetDriveType(root) delivers the drive type, as removeable, fixed, cdrom and some others:
wchar_t rootPath[] = L"X:\\";
rootPath[0] = letter;
DWORD DriveType = GetDriveType( rootPath );
switch ( DriveType ) {
case DRIVE_CDROM:
// CD/DVD/BR drive
break;
case DRIVE_REMOVABLE:
// most flash drives, card readers
break;
case DRIVE_FIXED:
// some flash drives, hard drives
break;
default:
// never seen for USB drives
break;
}
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