Enabling 48-bit LBA for ATAPI in Windows 2000/XP.Windows 2000
Start the registry editor. Click Start, Run, and type “regedit32.exe” (omitting the quotes).
Drill down to: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Atapi\Parameters\
On the Edit menu, click Add Value, and then add the following registry value:
Value name: EnableBigLba
Data type: REG_DWORD
Value data: 0×1
Quit the registry editor and reboot.
Windows XP/SP1/SP2
Start the registry editor. Click Start, Run, and type “regedit” (omitting the quotes)
Drill down to: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Atapi\Parameters\
Under the last value, right click and from the New drop out menu, select “DWORD value”.
Rename the new DWORD value to “EnableBigLba” (omitting the quotes).
Double click the new DWORD value, and type a “1″ (omitting the quotes”) in place of the 0.
Make sure that Hexadecimal is selected on the right.
Quit the registry editor and reboot.
Where is the space? My drive didn’t get any bigger!
Right click My Computer, on your Windows Desktop, and select Manage. Alternatively, you can go to the Administrative tools and select Computer Management.
On the left hand side, click “Disk Management”. In the Disk Management window you should see a block of space called “Un-allocated Space” from here you can format that space into a drive, and mount it under a folder (NTFS only) or you can merge it into another existing partition.
Further Information
If you would like further information, and other details about this problem, you can visit the Microsoft Knowledge Base pages where I got the information for this guide from.
http://support.microsoft.com/kb/305098/EN-US/
http://support.microsoft.com/default.aspx?scid=kb;en-us;303013
Comments @ eastonroyce