I’m trying to use the WinAPI function GetDiskSpaceInformationA (or its Unicode counterpart GetDiskSpaceInformationW) to retrieve disk space information for USB volumes on Windows. However, I’ve encountered an issue where these functions seem to work for internal disks (e.g., C:), but fail with the error ERROR_INVALID_PARAMETER when I try to use them on USB volumes.

I’ve tried various ways to specify the USB volume path, including:

• Drive letter (e.g., D:)
• Drive letter without trailing backslash (e.g., D:)
• Volume GUID path (e.g., \?Volume{GUID})
• Volume GUID path without trailing backslash (e.g., \?Volume{GUID})

But none of these approaches have succeeded. The functions only seem to work for internal disks, not USB volumes.
Is this a limitation of these functions, or am I doing something wrong? Is there a different API function I should be using to retrieve disk space information for USB volumes on Windows?
Any guidance or insights would be appreciated.