How to get the drive letter with physical address ?

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How to get the drive letter with physical address like "\\\\.\\PHYSICALDRIVE0"?
If we give the physical address.. It should return the drive letter assigned to that drive?? help me

Posted 2-May-11 21:54pm

Gokulnath007

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«_Superman_» · Answer 1 · 2011-05-02T22:03:00

Solution 1

That is not possible because a physical drive can contain multiple drive letters.
You can however do the reverse, i.e, open a volume and get the physical drive to which it belongs.

Here is what you can do.

1. Enumerate all volumes - GetLogicalDrives.
2. Open each volume - eg. CreateFile(L"\\\\.\\C:", ...
3. Call DeviceIoControl on the handle returned by CreateFile with IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS.

Posted 2-May-11 22:03pm

«_Superman_»

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Gokulnath007 3-May-11 4:11am

GetLogicalDrives containing only number. How to get the individual drive letter with the logical drive function. Help me regarding this.

«_Superman_» 3-May-11 4:16am

If you read the documentation properly, you can see that the number is actually a bit field where each bit represents a drive letter. You can check this as follows -
if (dwDrives & 1) A: exists.
if (dwDrives & 2) B: exists.
if (dwDrives & 4) C: exists.

You can get this in a for loop.
Try this -

for (int i = 0; i < 32; ++i)
{
if (dwDrives & (1 << i))
cout << 'A' + i << " exists\n";
}

Olivier Levrey 3-May-11 4:41am

Good answer. Have a 5.