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Windows 137GB Barrier
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Windows 137GB Capacity Barrier

The 137GB barrier is also known as 48-bit LBA (logical block addressing) support for IDE/ATA, ATAPI and SATA disk drives. Such barrier does not affect SCSI hard disks.


Important Note - Formatting IDE/ATA hard disk past 137 GB without meeting necessary reuirements will result in data loss. Always backup your data or have necessary recovery plan before attempt to perform any disk configuration or operation.


How to overcome?


The common methods are:


  • OS based solutions if Windows XP or Windows 2000
  • Use Ultra ATA/133 MHz PCI controller card for Windows XP, 2000, ME, 98 Second Edition, and NT4
  • Chipset and driver support for Windows ME, 98 Second Edition, and NT4

OS based Solution for Windows XP/2000


You must have a 48-bit LBA compatible BIOS.


Install latest Service Pack:


  • Windows 2000 Professional - SP3 or higher
  • Windows 2000 Sever - SP3 or higher
  • Windows XP Home Edition - SP1 or higher
  • Windows XP Professional Edition - SP1 or higher

Windows XP SP1 includes 48-bit LBA support for ATAPI disk drives. With this support, you can use hard disks that are larger than the current 137 GB limit. By default, support is enabled in SP1. To determine if you are running SP1, right-click My Computer and then click Properties. On the General tab, Service Pack 1 will be listed under System.


Extra Steps are needed for Windows 2000:


You must enable the support in the Windows registry by adding or changing the EnableBigLba registry value to 1 in the following registry subkey: HKEY_LOCAL_MACHINE\ SYSTEM\ CurrentControlSet\ Services\ atapi\ Parameters


To enable 48-bit LBA large-disk support in the registry:


  • Start Registry Editor (Regedt32.exe)
  • Locate and then click the following key in the registry: 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: 0x1
  • Quit Registry Editor.

For more details, please refer to the following articles from microsoft knowledge base:


  • Q303013 - "How to enable 48-bit logical block addressing support for ATAPI disk drives in Windows XP"
  • Q305098 - "48-bit LBA support for ATAPI disk drives in Windows 2000"

Ultra ATA/133 MHz PCI controller card for Windows XP, 2000, ME, 98 Second Edition, and NT4


Simply use a new Ultra ATA/133 host adapter (controller card) that is fully compatible with all capacities. Before buying the card, be sure to verify with the supplier that the card do breaks the 137GB barrier, or visit the manufacturer's website to confirm the technical specifications.


Use Intel Chipset for Windows ME, 98 Second Edition, and NT4


Applicable for motherboards that use the following Intel chipsets:


Intel 810, 810E, 810E2, 815, 815E, 815EP, 815P, 820, 820E, 830M, 830MP, 830MG, 840, 845, 850 or 860


The Intel Application Accelerator v2.3 or above support IDE/ATA hard disk above 137GB, and is compatible with Windows 2000, XP, ME, 98 Second Edition and NT4.


The driver may be download from www.intel.com/support/chipsets/iaa.


Other chipsets such as VIA, ALi, SiS, Promise, etc may have drivers that support above 137GB in a similar way, please refer to the respective web site for more information.