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There have been many threads about why the 127Gb limit occurs and how to fix it. This can be caused by using and older motherboard without LBA enabled, not having SP1 installed with you copy of XP, and that basically hard drive manufactures use a different method of measuring Gb's that others do. IE a 40Gb HDD is actually only a 37.4Gb capacity. (They use 1000Mb to define a Gb when most people use 1024Mb to define a Gb)
The following links describe the Microsoft method of enabling 48 bit addressing which is the cause of your computer from not recognise larger than 127Gb drives.
http://support.microsoft.com/default.aspx?scid=kb;en-us;303013
1. Click Start, click Search, and then click All Files and Folders.
2. Type Atapi.sys, and then click Search.
3. If you do not find the Atapi.sys file in your %systemroot%\system32\Drivers folder, click More advanced options in Search Companion, click Search hidden files and folders, and then repeat step 2.
For additional information about how to search for hidden and system folders, click the following article number to view the article in the Microsoft Knowledge Base:
302347 (http://support.microsoft.com/kb/302347/) How to search for hidden or system files in Windows XP
4. Right-click Atapi.sys in your %systemroot%\System32\Drivers folder, and then click Properties.
5. Note the file version on the Version tab.
Further down in the linked document is a method of enabling LBA in an unattended instalation.
Other methods also include flashing your BIOS to the latest version, Repartioning your hard drive using either a 3rd party software tool like Partition Magic or a free tool from freeware. or from here Ranish Partition manager
If you have run the program as shown in the link and your computer refuses to see any more than 127Gb then you will need to flash your BIOS with the latest version.
