Possibly it might have been this?
To initialize new disks. (From Help and Support)
Open Computer Management (Local).
In the console tree, click Disk Management.
Navigate to -
Computer Management (Local) / Storage / Disk Management
Right-click the disk you want to initialize, and then click Initialize Disk.
In the Initialize Disk dialog box, select the disk(s) to initialize.
If you are running Windows XP 64-Bit Edition, you can select whether to use the master boot record (MBR) or GUID partition table (GPT) partition style.
The disk is initialized as a basic disk.
Notes
To open Computer Management, click Start, point to Settings, and then click Control Panel.
Double-click Administrative Tools, and then double-click Computer Management.
You must be logged on as an administrator or a member of the Administrators group in order to complete this procedure. If your computer is connected to a network, network policy settings may also prevent you from completing this procedure.
New disks appear as Not Initialized. Before you can use a disk, you must first initialize it. If you start Disk Management after adding a disk, the Initialize Disk Wizard appears so you can initialize the disk.