Windows XP Service Pack 1 (SP1) and Windows 2000 SP3 add support for 48-bit Logical Block Addressing (LBA), which lets you access hard disks larger than 137GB. To enable 48-bit LBA, perform the following steps:
Start a registry editor (e.g., regedit.exe).
Navigate to the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\atapi\Parameters registry subkey.
From the Edit menu, select New, DWORD Value.
Enter the name EnableBigLba, then press Enter.
Double-click the new value, set it to 1, then click OK.
Close the registry editor.
Restart the machine for the change to take effect.