How to Get Mount Point from Device Name

device driver

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How to Get Mount Point from Device Name

Postby TWljaGVsbGU » Fri, 18 Feb 2005 00:09:01 GMT

I am trying to find the mount point of a partition based on the device name 
obtained from Microsoft Cluster. As far as I know, if a drive letter is not 
assigned to the partition, the device name returned by  Microsoft Cluster is 
formatted as "Disk##Partition##". To get the mount point, one way (I am not 
sure if it is safe) I have tried is:

1. Parse the device name to a format like 

2. GetVolumeNameForVolumeMountPoint() - Using the disk and partition number. 
I can use this function to get the unique volume name i.e. pass 
and get back something like 

3. GetVolumePathNamesForVolumeName() - Using the unique volume name. I can 
use this function to get the path name i.e. pass 
\\?\Volume{1938fbd3-7961-11d9-b611-0050dabfbe25}\ and get back the mount 
point, eg. Z:\mnt\

My concern is about the first step, that is, my code has to rely on the 
format of the device name returned by Microsoft Cluster. 

Is "Disk##Partition##" the only format of the device name known to Microsoft 
Cluster, provided a drive letter is not assigned??? What if the disk is a 
remote one?

If the device name is not a good option, are there other ways of getting the 
partition's mount point based on the information known to the microsoft 
cluster? I have thought about the volume serial number. But I guess the 
serial number is only unique in one machine. In a cluster environment, there 
might be two partitions formatted by different hosts and have the same serial 

Please help!

Re: How to Get Mount Point from Device Name

Postby Robert Marquardt » Fri, 18 Feb 2005 02:23:26 GMT

From an earlier message here:

RE: How to match between physical usb device and its drive letter?
"Kiran" < XXXX@XXXXX.COM >
Wed, 20 Oct 2004 22:01:02 -0700


There is no simple/direct way of obtaining the drive letter.

The following code can be used to get the drive letter
But you have to modify them here and there to meet you need.


struct tagDrives
WCHAR letter;
} g_drives[26];

WCHAR cDrive;

// Get all removable disks on user laptop.
WRITELOG("Error - GetAllRemovableDisks failed\n");
return 0;

// Alocate memory to device ID

// Get device ID corresponding to USBFM from registry.
if(!GetRegValue(lpDevID, DEVICE_ID, dwSize))
WRITELOG("Error - Registry - USBFMDevID failed\n");
return 0;

// Get drive corresponding to the registry entry.
cDrive = GetSpecificDrive(lpDevID);


// return the drive letter.
return cDrive;

* GetAllRemovableDisks - This function retrieves volume information for all
removable disks
* In: None
* Out: TRUE - Success
* FALSE - Failure

BOOL GetAllRemovableDisks()
WCHAR caDrive[4];
int nLoopIndex;
DWORD dwDriveMask;

caDrive[0] = 'A';
caDrive[1] = ':';
caDrive[2] = '\\';
caDrive[3] = 0;

g_count = 0;

// Get all drives in the system.
dwDriveMask = GetLogicalDrives();

if(dwDriveMask == 0)
WRITELOG("Error - GetLogicalDrives failed\n");
return FALSE;

// Loop for all drives (MAX_DRIVES = 26)

for(nLoopIndex = 0; nLoopIndex< MAX_DRIVES; nLoopIndex++)
// if a drive is present,
if(dwDriveMask & 1)
caDrive[0] = 'A' + nLoopIndex;

// If a drive is removable
if(GetDriveType(caDrive) == DRIVE_REMOVABLE)
//Get its volume info and store it in the global variable.
if(GetVolumeNameForVolumeMountPoint(caDrive, volume, BUFFER_SIZE))
g_drives[g_count].letter = caDrive[0];
wcscpy(g_drives[g_count].volume, volume);
g_count ++;

dwDriveMask >>= 1;

// success if atleast one removable drive is found.
if(g_count == 0)
return FALSE;
return TRUE;

* GetSpecificDrive - This function returns the drive corresponding to the
given device ID
* In : lpDevID - Device ID
* Return: Drive letter corresponding to the given device ID.

WCHAR GetSpecificDrive(
GUID guid;
DWORD dwRequiredSize ;
DEVINST devInstParent;
DWORD dwIndex;
int nLength,nLoopIndex;


Similar Threads:

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2.Getting File Object and Device Object without Device Name

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3.Request for help with resolving mount point name to a more friendly name.

Can you explain a little more about "netroots"?


"Maxim S. Shatskih" < XXXX@XXXXX.COM > wrote in message
news: XXXX@XXXXX.COM ...
> Redirectors do not use mount points.
> They use the "netroots", and the only access to them is via MPR.DLL.
> MountMgr cannot help with them.
>     Max
> "Shawn Anderson" < XXXX@XXXXX.COM > wrote in message
> news: XXXX@XXXXX.COM ...
> > Thanks for the suggestion, but that will not work with mount points
> that are
> > caused by the Network Redirector.  Anyone have any other ideas?
> >
> > "Maxim S. Shatskih" < XXXX@XXXXX.COM > wrote in message
> > news: XXXX@XXXXX.COM ...
> > > > I am currently trying to resolve what I think is a mount point
> > > >
> > > > Examples:
> > > >
> \Device\HarddiskDmVolumes\PhysicalDmVolumes\BlockVolume1\Projects
> > > > \Device\HarddiskVolume2
> > > >
> > > > Into something that I can display to a user
> > >
> > > FindFirstVolumeMountPoint/FindNextVolumeMountPoint in user mode.
> > >
> > >     Max
> > >
> > >
> >
> >

4.Mount Points

I wont to get the mount points associated with a Physical Disk Drive
Is there any IOCTL or API which will return me the corresponding mount points given a signature or Physical disk number.

5.match a mount point or driver letter to its USBSTOR registry entry

I am trying to figure out the following:

Given a volume or mount point or volume name retrieve its entry in 

Seems like the solution should be a combination of the SetupAPI and Volume 
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Any ideas would be appreciated.

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