It sounds as though you need to format the drive.
Right-click My Computer, select "Manage"/Disk Management.
You should have an entry for a new drive if the autodetect worked.
Right-click the drive to partition and format.

Donald DeWitt wrote:
> Hello members, I'm not sure this update was posted or not........
> I need advice installing a second hard drive as a slave. I have a Dell XPS
> 400 running with XP. I purchased a new Seagate 160GB Serial ATA w/NCQ
> 7200/8MB from an internet company. I installed the drive and connected the
> cable to the drive and the motherboard also connected the power plug to the
> drive. The computer doesn't recognize the drive by clicking on "My 
> Computer"
> also the Add Hardware Wizard cannot find it. The drive did not come with an
> installation CD or installation instructions.
> 
> ...in the BIOS under SATA Operation, there are four (4) options.
> 1. RAID Autodect/AHCI
> 2. RAID Autodect/ATA
> 3. RAID on
> 4. Combination
> The factory default is set at RAID Autodect/AHCI.
> I assume the RAID Autodect/ATA is the correct choice here but I'm not sure
> of this and I don't want to get myself in trouble.......

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