Adding capacity to RAID5, all ports full

Hey all,

I have a question that I could not find an answer to after a bunch of searching, so please forgive me if the answer is staring me in the face.

I built a file server a while back for all my movies/music and file backups below is a list of the hardware:

Abit MATX motherboard
36Gb WD Raptor HDD (for OS only)
four WD 750GB HDD's (in RAID 5)
Highpoint Rocketraid 2310 RAID controller (4-SATAII ports, PCI-e 4x)
500W Silverstone PSU

The Rocketraid RAID controller I have has four SATA ports, and each port is attached to a 750Gb HDD. In the RAID5 array, this gives me a total capacity of 2TB. A year + after building it, it is now 85% full. I want to increase the capacity.
I researched OCE (which this card does support) both in the user manual and online, but it seems that this function is for adding capacity only by adding disks to unused ports. Since the server does not have the physical space for more drives, and all of the ports are being used on the card, would I be able to replace all the drives with 2TB HDD's? I think it should be possible to:

Remove drive 0, replace with new 2TB HDD, rebuild array.
Remove drive 1, replace with new 2TB HDD, rebuild array.
Remove drive 2, replace with new 2TB HDD, rebuild array.
Remove drive 3, replace with new 2TB HDD, rebuild array.
Once array is rebuilt with new disks, increase partition size to 5.5TB.

Am I way off base? Please let me know if there is any other way to increase capacity other than building a whole new server and transferring the data. Thanks in advance!

Hey guy, You are right. The OCE for adding capacity can be only by adding disks to unused ports. Therefore your way is not feasible.
I suggest some way for you. First you must use some extra storage to backup your data. After you can:
A:
If you use:
1. Windows 2003 with sp1 and later
2. Windows Vista. (all version)
3. Windows XP(64bit)
Then you can direct create a new RAID 5 in WebGUI.
B:
If you use:
1. Windows XP(32BIT)
2. Windows 2K
3. Windows 2003 without sp1
Then you need to set RAID sector size to 4K VSS (Variable Sector Size) to create new RAID 5 in WebGUI.
(How to Setup and Configuration of VSS with HighPoint Web GUI in below:
http://www.techwarelabs.com/review [...] _raid_3520
HighPoint-Variable-Sector-Size-Dec207.doc)
The Variable Sector Size only designed for Data RAID Array or non-bootable RAID array.
Variable Sector Size Manual in below:
http://www.support-highpoint-tech. [...] ad/VSS.pdf
Finally you must transferring your data to new RAID 5.