Expand disks using Diskpart

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In example below it will expand the disk by 10GB, if no size is specified all available space will be allocated to the partition. Keep in mind that Windows 2003 doesn't allow to expand system volume.

DISKPART > Select Disk 0 ("This assumes that DISK 0 is your boot disk")
 Disk 0 is now the selected disk.

DISKPART > Detail Disk
 Controller Type SCSI Disk Device
 Disk ID: 2FE43460
 Type : SCSI
 Bus : 3
 Target : 0
 LUN ID : 0

Volume ###  Ltr  Label    Fs    Type       Size    Status   Info
 ---------- --- -------- ----- ---------- ------- --------- --------
 Volume 1    D   Data     NTFS  Partition  68 GB   Healthy  System

DISKPART > Select Volume 1
 Volume 1 is the selected volume.

DISKPART > Extend Size=10000 
Disk Part successfully extended the volume.

DISKPART > Exit