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.

This can be via GUI just with right click - expand if there is free space right after it.

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

If the Recovery partition is between the volume and the empty space, you can delete and recreate it:

 Disable the existing Windows Recovery Partition by running reagentc /disable
 Use diskpart to remove the recovery partition
 list disk
 select disk # where # is the disk needing the recovery partition removed
 list partition
 select partition # where # is the recovery partition
 delete partition override to force deletion of the recovery partition
 Expand the disk using Disk Management, leaving ~1024 MB at the end of the drive for recreating the recovery partition
 Create New Simple Volume for Recovery, NTFS, no drive letter
 use diskpart to set the recovery partition attributes
 list partition
 select partition # where # is the new recovery partition
 For GPT disks run set id=de94bba4-06d1-4d40-a16a-bfd50179d6ac & gpt attributes=0x8000000000000001
 For MBR disks, run set id=27
Re-enable the recovery partition by running reagentc /enable