c++ - Programmatically differentiating between USB Floppy Drive and USB Flash Drive in Windows

Question

On Windows (XP-7), is there a reliable way of programatically differentiating between USB floppy drives and USB flash drives in C++?

At the moment, I'm using WMI to get updates when new Win32_LogicalDisk instances are detected, and then using the DriveType attribute of the LogicalDisk object to figure out a basic type. This works quite well, except that floppy drives and USB flash drives are both of DriveType DRIVE_REMOVABLE, so to differentiate between those (floppy vs. flash), I'm using the IOCTL_STORAGE_GET_HOTPLUG_INFO interface to figure out if the device is hotpluggable, and was working on the principal that that meant it was a flash drive and not a floppy. Again, I think this works quite well (if a little inefficient, using both the WDK API and WMI to get info ) in the case of internal floppy drives, but unfortunately USB Floppy drives are also hotpluggable a lot of the time, so there is no clear way to differentiate between flash and USB floppy drives, that I can see. I know there are properties that may work, like checking if its mapped to the reserved drives A: or B (edit: only relevant if the machine definitely has a floppy drive - see MS-KB: How to change drive letter assignments in Windows XP), or looking at the description, but I'd really like something a bit more reliable.

Sorry about the long explanation, but just wanted to be clear! Thanks

Answer 1

Did you try Win32_LogicalDisk.MediaType? It has specific enumerations for floppy disks. Make sure you try it when there's no disk in the drive.