CAn I disable RAID on a DEll powervault 770n server

manufacturer?

Kindly update the firmware of tapedrive and library

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RAID menu will either be CTRL-A (if you are using the onboard PERC 3/Di) or CTRL-M (if you are using an addin PERC 3/4). If you are not seeing either of these options, then you may not have it enabled in the BIOS. In the BIOS (F2), go to Integrated Devices and make sure that RAID is Enabled. In order to enable RAID, your server MUST have a RAID key, RAID memory DIMM (different from system memory), and a RAID battery.

Try using the drive in question on the controller card that you're on the good one.

The raid may be fine you need to reinstall the OS.
The best way is to drop the raid array astablish a new raid array then install you new OS on a new raid array.Very nice server you have.

I recommend that you first try replacing the power cord, if that doesn't work try replacing the power supply.

I don't KNOW that this will work, but what I'd reccomend is that you try using the drivers for windows 2000 on your windows XP machine

a list of dell drivers and support for the powervault is here:

http://search.dell.com/results.aspx?s=biz&c=us&l=en&cs=555&k=powervault+100T+driver+XP&cat=sup&x=0&y=0&p=1