Unable to write directly to the disk

[RobbieE]

I'm having a problem writing directly to a disk, I'm trying to write a Qt version of the old PARTCOPY (now obsolete on systems incompatible with 16-bit)

I'm using Windows 10, and have my program elevated to Administrator privileges.

Every time I try to open "\\.\A:" in with QIODevice::WriteOnly, I get an error message "The parameter is incorrect".

Using Visual Studio step-wise debugging, I think I've found the problem occurs in QFSEnginePrivate::nativeOpen() when tring to execute CreateFile().

The line:

// WriteOnly can create files, ReadOnly cannot.
    DWORD creationDisp = (openMode & QIODevice::WriteOnly) ? OPEN_ALWAYS : OPEN_EXISTING;

seems to be the cause. If I force the value of creationDisp to be OPEN_EXISTING, then I can get the file opened and I can write to the disk without any further problems. The issue is that I don't know what way I can get this working without using the debugger.

Has anyone found a solution to this?

[SGaist]

Hi and welcome to devnet,

Are you opening the file in ReadWrite mode ?