I do know that I had an issue with my IDE drive that if I enabled it in the bios it would cause the system to not get past post BUT if i left it disabled Windows did see and recognize the drive. So you might want to check that out. Seems like SATA and IDE don't play well together on the 720.
As to your other questions, DO NOT enable RAID. That function is for your SATA drives, and yes it will cause you to lose your Data as it will overwrite the MBR on the two SATA drives you all ready have.
There really is no limit on the amount of storage you can have running XP SP2 or greater. Remember that a good portion of a hard disk is reserved for file management and disk operating memory so .5 out of a 1.5 TB is about right.
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Dell Studio XPS 1645 Window 10 Pro
Forum member since 2003
Well, I tried doing a few things in the FAQ. (http://en.community.dell.com/forums/t/19240903.aspx) From there i used the wizard. From the wizard I learned that I needed to put my hard drives on cable select. I did this but the bios still couldn't detect the hard drives. To check to see if their was a problem with my ide cable or the connector on the motherboard I reconnected one of my IDE DVD-ROM drives to the master portion of the cable (the very end of the cable). My bios was able to detect the DVD drive. Then I disconnected the DVD drive and placed it in slave portion of the ide cable (which is the connector in the middle of the ide cable). It worked again. The bios was able to detect the drive. So I tried to connect two ide DVD-Rom drives to the master and slave portions of the ide cable. For some reason the bios was able to detect only one DVD-ROM drive. SO I determined nothing was wrong with the cable or the connector on the board. Apparently it is some type of incompatibility. I tried connecting only one pata hard drive to cable on the master portion of the ide cable and the bios was able to successfully detect the hard drive, but when I connected it to the slave portion it didn't detect the hard drive.
So basically I learned that I can only connect one pata hard drive, set to cable select, to the master portion of the IDE cable and I can add one IDE DVD-ROM drive to the slave portion of the cable, but i can't add two PATA hard drives at the same time and I can't add two IDE DVD drives at the same time.
I did read somewhere that you could only add one PATA hard drive at one time, but I wasn't sure if the info could be applied to my PC because the tread I read was talking about another Dell PC.
Davet50 , thanks for answering my post. I'll be sure never to turn on RAID. Are you sure about the limit to the 1.5 TB. I think the storage is limited by the actual computer, not the OS. most of the .5 TBs is raw.
.5 terrabytes = 500 gigabytes I think. That's an abnormally large amount to reserve for file management and disk operating memory.