After you apply SP1 for Windows XP, you can manually enable support for hard drives that exceed 137GB, if:

- You have a 48-bit LBA compatible BIOS.

- You have a hard disk with a capacity that is greater than 137GB.

If you DO NOT meet these requirements, you will likely trash your entire system by implementing this tip.

To enable 48-bit LBA support:

1. Use the Registry Editor to navigate to:


2. Add Value Name EnableBigLba, a REG_DWORD data type, and set the data value to 1.

3. Restart Windows XP.

NOTE: DO NOT install any previous operating system on a disk created using this tip, as data loss will occur.