Enumerating USB device

Hi,

I have a USB device that has 2 logical units.
USBSTOR\DISK&VEN_XXXX&PROD_YYYY&REV_0100\012345678 9990&0 (Drive A

USBSTOR\DISK&VEN_XXXX&PROD_YYYY&REV_0100\012345678 9990&1 (Drive B

I used SetupDiEnumDeviceInterfaces() func and I get just
one:USBSTOR\DISK&VEN_XXXX&PROD_YYYY&REV_0100\01234 56789990

I guess this is understandable since there is only one physical device.
However, is there a function that I can use to get both the drive letters?

I used the DEVINTERFACE_VOLUME GUID for the SetupDiEnumDeviceInterfaces()
function.

> I guess this is understandable since there is only one physical device.
> However, is there a function that I can use to get both the drive letters?

Enumerate all letters, call IOCTL_STORAGE_GET_DEVICE_NUMBER on each.

Open each USBSTOR's device, and call the same IOCTL on each.

Then match the results.

--
Maxim S. Shatskih
Windows DDK MVP

http://www.storagecraft.com

Maxim,

I got the device numbers for the 2 logical units along with their volume IDs
using the method you mentioned.

With this drive, at startup only the first logical drive is visible. The
second one opens up only after successful authentication.
To figure out if the second drive opened up and is available, I would need
to match the device instance IDs of the 2 drive letters. I can't use the
volume ID since it is assigned by windows?
However, like I mentioned before, I am able to get only one instance ID
using the SetupDi function.

Also if multiple USB devices are plugged in, DeviceInstanceID is the only
way I can identify multiple instances of the same device present on the
system, right?

"Maxim S. Shatskih" wrote:

> > I guess this is understandable since there is only one physical device.
> > However, is there a function that I can use to get both the drive letters?
>
> Enumerate all letters, call IOCTL_STORAGE_GET_DEVICE_NUMBER on each.
>
> Open each USBSTOR's device, and call the same IOCTL on each.
>
> Then match the results.
>
> --
> Maxim S. Shatskih
> Windows DDK MVP
>
> http://www.storagecraft.com
>
> .
>

> To figure out if the second drive opened up and is available, I would need
> to match the device instance IDs

No need.

Just find your parent USB device using CM_xxx and SetupDiXxx, and enumerate its children. If there are 2 of them - then the secure device is authenticated and running. If there is only 1 - then it is not such.

--
Maxim S. Shatskih
Windows DDK MVP

http://www.storagecraft.com

Thank you so much, Maxim. I got the 2 IDs using the Get_Child and Get_Sibling
calls as you suggested.

Appreciate the help.


"Maxim S. Shatskih" wrote:

> > To figure out if the second drive opened up and is available, I would need
> > to match the device instance IDs
>
> No need.
>
> Just find your parent USB device using CM_xxx and SetupDiXxx, and enumerate its children. If there are 2 of them - then the secure device is authenticated and running. If there is only 1 - then it is not such.
>
> --
> Maxim S. Shatskih
> Windows DDK MVP
>
> http://www.storagecraft.com
>
> .
>

I enumerated all drive letters and got the corresponding volume names.

I then used the SetupDiXXX and CM_Get_XXX to find the parent and the children.
(This helps me find the 2 logical volumes - say E: and F. The volume names
are different for the 2 logical drives and so are the device numbers(they are
3 and 1 respectively).

However, when I do a GetVolumeNameForVolumeMountPoint() on the
pDevDetail->DevicePath(which I obtained using the SetupDiXXX function) for
the particular USB device, I get only the second volume name and hence the
second drive letter(F. ALthough I have both E: and F: to the original
enumerated list, I am not sure how I can use this to get the primary drive
letter?

I think the last few letters of the volume name are the same for both E: and
F:. Can I use that reliably to do a string compare and obtain the primary
drive letter (i.e E?





I am trying to tie t

"Odomae" wrote:

> Thank you so much, Maxim. I got the 2 IDs using the Get_Child and Get_Sibling
> calls as you suggested.
>
> Appreciate the help.
>
>
> "Maxim S. Shatskih" wrote:
>
> > > To figure out if the second drive opened up and is available, I would need
> > > to match the device instance IDs
> >
> > No need.
> >
> > Just find your parent USB device using CM_xxx and SetupDiXxx, and enumerate its children. If there are 2 of them - then the secure device is authenticated and running. If there is only 1 - then it is not such.
> >
> > --
> > Maxim S. Shatskih
> > Windows DDK MVP
> >
> > http://www.storagecraft.com
> >
> > .
> >

> However, when I do a GetVolumeNameForVolumeMountPoint() on the
> pDevDetail->DevicePath(which I obtained using the SetupDiXXX function)

I cannot understand why are you doing this. What is the purpose?

--
Maxim S. Shatskih
Windows DDK MVP

http://www.storagecraft.com

GetVolumeNameForVolumeMountPoint returns FALSE for one
volume? For which one? What does GetLastError say?

Volume names using GUIDs, string compares are good for
finding identical ones only. Finding similar ones does
not work.

Uwe



Odomae wrote:
> I enumerated all drive letters and got the corresponding volume names.
>
> I then used the SetupDiXXX and CM_Get_XXX to find the parent and the children.
> (This helps me find the 2 logical volumes - say E: and F. The volume names
> are different for the 2 logical drives and so are the device numbers(they are
> 3 and 1 respectively).
>
> However, when I do a GetVolumeNameForVolumeMountPoint() on the
> pDevDetail->DevicePath(which I obtained using the SetupDiXXX function) for
> the particular USB device, I get only the second volume name and hence the
> second drive letter(F. ALthough I have both E: and F: to the original
> enumerated list, I am not sure how I can use this to get the primary drive
> letter?
>
> I think the last few letters of the volume name are the same for both E: and
> F:. Can I use that reliably to do a string compare and obtain the primary
> drive letter (i.e E?
>
>
>
>
>
> I am trying to tie t
>
> "Odomae" wrote:
>
>> Thank you so much, Maxim. I got the 2 IDs using the Get_Child and Get_Sibling
>> calls as you suggested.
>>
>> Appreciate the help.
>>
>>
>> "Maxim S. Shatskih" wrote:
>>
>>>> To figure out if the second drive opened up and is available, I would need
>>>> to match the device instance IDs
>>> No need.
>>>
>>> Just find your parent USB device using CM_xxx and SetupDiXxx, and enumerate its children. If there are 2 of them - then the secure device is authenticated and running. If there is only 1 - then it is not such.
>>>
>>> --
>>> Maxim S. Shatskih
>>> Windows DDK MVP
>>>
>>> http://www.storagecraft.com
>>>
>>> .
>>>

Maxim, I am trying to get both drive letters because I need to send some
commands to the first drive (which is read only) and others to the second
one(which is a writeable partition)

Uwe, GetVolumeNameForVolumeMountPoint() returns false for the second
writeable drive partition. It returns the volume name correctly for the first
partition. I havent checked the GetLastError() code on the fail. I will check
and let you know.

"Uwe Sieber" wrote:

>
> GetVolumeNameForVolumeMountPoint returns FALSE for one
> volume? For which one? What does GetLastError say?
>
> Volume names using GUIDs, string compares are good for
> finding identical ones only. Finding similar ones does
> not work.
>
> Uwe
>
>
>
> Odomae wrote:
> > I enumerated all drive letters and got the corresponding volume names.
> >
> > I then used the SetupDiXXX and CM_Get_XXX to find the parent and the children.
> > (This helps me find the 2 logical volumes - say E: and F. The volume names
> > are different for the 2 logical drives and so are the device numbers(they are
> > 3 and 1 respectively).
> >
> > However, when I do a GetVolumeNameForVolumeMountPoint() on the
> > pDevDetail->DevicePath(which I obtained using the SetupDiXXX function) for
> > the particular USB device, I get only the second volume name and hence the
> > second drive letter(F. ALthough I have both E: and F: to the original
> > enumerated list, I am not sure how I can use this to get the primary drive
> > letter?
> >
> > I think the last few letters of the volume name are the same for both E: and
> > F:. Can I use that reliably to do a string compare and obtain the primary
> > drive letter (i.e E?
> >
> >
> >
> >
> >
> > I am trying to tie t
> >
> > "Odomae" wrote:
> >
> >> Thank you so much, Maxim. I got the 2 IDs using the Get_Child and Get_Sibling
> >> calls as you suggested.
> >>
> >> Appreciate the help.
> >>
> >>
> >> "Maxim S. Shatskih" wrote:
> >>
> >>>> To figure out if the second drive opened up and is available, I would need
> >>>> to match the device instance IDs
> >>> No need.
> >>>
> >>> Just find your parent USB device using CM_xxx and SetupDiXxx, and enumerate its children. If there are 2 of them - then the secure device is authenticated and running. If there is only 1 - then it is not such.
> >>>
> >>> --
> >>> Maxim S. Shatskih
> >>> Windows DDK MVP
> >>>
> >>> http://www.storagecraft.com
> >>>
> >>> .
> >>>
> .
>