Re: How do you get the number of physically installed hard disks (Win32)?

NTDEV
1

RB>In my experience the enumeration index of a disk device in either
RB>SetupDiEnumDeviceInterfaces() or SetupDiEnumDeviceInfo() just is it’s
RB>physical drive number. So based on the code I posted, you could also do

RB>while ( SetupDiEnumDeviceInfo(hDevInfoSet, dwDisks, &DevInfoData) )
RB>{
RB> wsprintf(szDisk, “\\.\PHYSICALDRIVE%d”, dwDisks);
RB> CreateFile(szDisk, …);
RB> dwDisks++;
RB>}

In my experience, I have seen the \.\PHYSICALDRIVEN not to be in sequence,
as in from 0 to N-1 especially in SAN environment. For an example, I have
disk being shown as \.\PHYSICALDRIVE15 when there are just 3 disks.
Is there any way to this win32 name from other win32 name, which you get
from interface detail info.Winobj info is updated for such devices, any clue
which calls/data structures is it using?

thanks
pashupati

-----Original Message-----
From: Ralf Buschmann [mailto:xxxxx@backmagic.de]
Sent: Thursday, October 10, 2002 2:03 PM
To: NT Developers Interest List
Subject: [ntdev] Re: How do you get the number of physically installed
hard disks (Win32)?

Pashupati,

you wrote on Thursday, October 10, 2002, 20:04:17:

PK> fine. you can get total number of physical drives and also the
PK> interface name (in form guid) by calling another setup API func.

Right, that would be an interface class enumeration calling
SetupDiGetClassDevs() for GUID_DEVINTERFACE_DISK with flag
DIGCF_INTERFACEDEVICE. You the use SetupDiEnumDeviceInterfaces() to
enumerate and can subsequently call SetupDiGetDeviceInterfaceDetail() to
obtain a Win32 device name that you can pass directly to CreateFile() to
obtain a handle to the device.

Take a look at
http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q264203 for a
great sample.

PK> Are you aware of any function which can give me indivual device name
PK> in form of \.\PHYSICALDRIVN.

In my experience the enumeration index of a disk device in either
SetupDiEnumDeviceInterfaces() or SetupDiEnumDeviceInfo() just is it’s
physical drive number. So based on the code I posted, you could also do

while ( SetupDiEnumDeviceInfo(hDevInfoSet, dwDisks, &DevInfoData) )
{
wsprintf(szDisk, “\\.\PHYSICALDRIVE%d”, dwDisks);
CreateFile(szDisk, …);
dwDisks++;
}

Ralf.

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