Physical drive size

[john5632]

But we nothing to do with file system, need to get physical disk size. Many other software are showing correct size for same memory card. Can you please give any idea?

[Lost User]

Maybe you need to show us the code you have tried.

Use the best guess

[john5632]

Below is WMI call

VariantClear(&vtProp);
hr = pclsObj->Get(L"Size", 0, &vtProp, 0, 0);

Below is IOCTL call

bResult = DeviceIoControl(hDevice, // device to be queried
IOCTL_DISK_GET_DRIVE_GEOMETRY, // operation to perform
NULL, 0, // no input buffer
pdg, sizeof(*pdg), // output buffer
&junk, // # bytes returned
(LPOVERLAPPED) NULL); // synchronous I/O

CloseHandle(hDevice);

	ULONGLONG DiskSize = 0;    // size of the drive, in bytes

DiskSize = pdg->Cylinders.QuadPart * (ULONG)pdg->TracksPerCylinder *
(ULONG)pdg->SectorsPerTrack * (ULONG)pdg->BytesPerSector;
wprintf(L"Disk size = %I64d (Bytes)\n"
L" = %.2f (Gb)\n",
DiskSize, (double) DiskSize / (1024 * 1024 * 1024));

But both gives same result. pdg->Cylinders.QuadPart is coming 1.

[john5632]

I tried IOCTL

DeviceIoControl(hDevice,IOCTL_DISK_GET_LENGTH_INFO,0,0,&gli,sizeof(gli),&ret,0);
ULONGLONG siize = gli.Length.QuadPart;

It gives correct result on VS2008 but not on VS2003. I need to code for VS2003. Please guide...

[Jochen Arndt]

The VS version should make no difference for device IO control API functions. But IOCTL_DISK_GET_LENGTH_INFO requires XP or later. To support older Windows versions use IOCTL_DISK_GET_PARTITION_INFO.

[Lost User]

Simple answer use VS2008 or later.

Use the best guess

[john5632]

But why it is not giving correct result on my machine win7+vs2003 but working fine with win7+vs2008. I can not use vs2008 simply because whole product is in vs2003 and need to make correction in same. please suggest solution...

[Chris Losinger]

you have a 30GB memory card? that's a strange size... they're sized in generally powers of two.

image processing toolkits | batch image processing

[Jochen Arndt]

I don't know why. DeviceIoControl() is a Windows kernel function that passes the request to the device specific driver. So there should be no differences on one machine when calling this from a VS 2003 or VS 2008 generated application or even any other programming language.

[dusty_dex]

Chris Losinger wrote:

you have a 30GB memory card? that's a strange size... they're sized in generally powers of two.

That's generally the case, but some lower capacity SSDs are specified in tens of gigs. try googling for 30GB/40GB SSD. ;)