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How can I configure Windows XP to access ATAPI hard disks larger than 137GB?
John Savill
September 25, 2002
1 Min Read
A. XP Service Pack 1 (SP1) adds support for 48-bit Logical Block Addressing (LBA) for ATAPI drives, which lets the OS access hard disks larger than 137GB (the current limit). For this change to work, you must have
a 48-bit LBA-compatible BIOS
a hard disk with a capacity greater than 137GB
XP SP1
To enable 48-bit support, perform the following steps:
Start a registry editor (e.g., regedit.exe).
Navigate to the HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesatapiParameters registry subkey.
From the Edit menu, select New, DWORD Value.
Enter a name of EnableBigLba, then press Enter.
Double-click the new value, set it to 1, then click OK.
Reboot the machine for the changes to take effect.
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