Is there any way to make sure a certain drive always has the same drive letter?

I have an external HDD plugged into my firewire, but its changed from G: to H: and iTunes cant find any of my music now. Is there a way of making it always G: and make sure nothing else can use that letter even if the drive isnt plugged in?

Cheers

Got this from MS website, dunno if its of any use tho.

How to assign a drive letter
To assign a drive letter to a drive, a partition, or a volume, follow these steps:
1. Log on as Administrator or as a member of the Administrators group.
2. Click Start, click Control Panel, and then click Performance and Maintenance.

Note If you do not see Performance and Maintenance, go to step 3. Performance and Maintenance appears in Control Panel only if you use Category view. If you use Classic view, Performance and Maintenance does not appear.
3. Click Administrative Tools, double-click Computer Management, and then click Disk Management in the left pane.
4. Right-click the drive, the partition, the logical drive, or the volume that you want to assign a drive letter to, and then click Change Drive Letter and Paths.
5. Click Add.
6. Click Assign the following drive letter if it is not already selected, and then either accept the default drive letter or click the drive letter that you want to use.
7. Click OK.
The drive letter is assigned to the drive, to the partition, or to the volume that you specified, and then that drive letter appears in the appropriate drive, partition, or volume in the Disk Management tool.


How to change a drive letter
To change an existing drive letter on a drive, on a partition, or on a volume, follow these steps:
1. Log on as Administrator or as a member of the Administrators group.
2. Click Start, click Control Panel, and then click Performance and Maintenance.
3. Click Administrative Tools, double-click Computer Management, and then click Disk Management in the left pane.
4. Right-click the drive, the partition, the logical drive, or the volume that you want to assign a drive letter to, and then click Change Drive Letter and Paths.
5. Click Change.
6. Click Assign the following drive letter if it is not already selected, click the drive letter that you want to use, and then click OK.
7. Click Yes when you are prompted to confirm the drive letter change.
The drive letter of the drive, the partition, or the volume that you specified is changed, and the new drive letter appears in the appropriate drive, partition, or volume in the Disk Management tool.

Thanks for that!

Spot on.