Extend size of a disk in Windows. For example if you increased the LUN size of a Vdisk in a EVA.
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Download tool from web:
http://www.microsoft.com/windows2000/techinfo/reskit/tools/new/diskpart-o.asp

run diskpart from commandprompt:
c:\ diskpart

Microsoft DiskPart version 5.1.3553
Copyright (C) 1999-2001 Microsoft Corporation.
On computer: PCIBRONNER03

DISKPART>

DISKPART> list disk

  Disk ###  Status      Size     Free     Dyn  Gpt
  --------  ----------  -------  -------  ---  ---
  Disk 0    Online        17 GB      0 B
  Disk 1    Online        16 GB   1000 B

DISKPART> select disk 1

Disk 1 is now the selected disk.

DISKPART> list disk

  Disk ###  Status      Size     Free     Dyn  Gpt
  --------  ----------  -------  -------  ---  ---
  Disk 0    Online        17 GB      0 B
* Disk 1    Online        16 GB   1000 B

DISKPART> list volume

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
  Volume 0     D                       CD-ROM          0 B
  Volume 1         HP_UTILITY   FAT    Partition     31 MB  Healthy
  Volume 2     C   NOSPART      NTFS   Partition     17 GB  Healthy    System
  Volume 3     E   DATA         NTFS   Partition     16 GB  Healthy

DISKPART> select volume e

Volume 3 is the selected volume.

DISKPART> list volume

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
  Volume 0     D                       CD-ROM          0 B
  Volume 1         HP_UTILITY   FAT    Partition     31 MB  Healthy
  Volume 2     C   NOSPART      NTFS   Partition     17 GB  Healthy    System
* Volume 3     E   DATA         NTFS   Partition     16 GB  Healthy

DISKPART> list partition

  Partition ###  Type              Size     Offset
  -------------  ----------------  -------  -------
* Partition 1    Primary             16 GB    32 KB

DISKPART> extend size=1024

size is in MB!

DISKPART> list disk

  Disk ###  Status      Size     Free     Dyn  Gpt
  --------  ----------  -------  -------  ---  ---
  Disk 0    Online        17 GB      0 B
* Disk 1    Online        17 GB      0 B


check also in computer management; storage; disk management! for new disk size.