48-bit LBA

Schnaufer

• 28-bit LBA Boundary
  - ( 2^28 * 512 ) / ( 1,000^3 ) = 137.44 => for 1K = 1,000, we get 137 GB
  - ( 2^28 * 512 ) / ( 1,024^3 ) = 128 => for 1K = 1,024, we get 128 GB
  
• 48-bit LBA Supported Platforms
  - Windows 2000 SP3 or later (registry mofification required)
  - Windows XP SP1 or later (registry mofification required)
  - Windows Server 2003 (no modification required)
  
• Registry Settings
  - System Key: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Atapi\Parameters]
  - Value Name: EnableBigLba
  - Data Type: REG_DWORD (DWORD Value)
  - Value Data: (0 = disabled, 1 = enabled)
  
  
• References
  - KB305098 - 48-Bit LBA Support for ATAPI Disk Drives in Windows 2000
  - KB303013 - How to enable 48-bit Logical Block Addressing support for ATAPI disk drives in Windows XP
  - KB314695 - Mirrored Drives Larger Than 137 GB Perform Slowly
  - KB327202 - The Fdisk.exe utility may not be able to create a hard disk partition that is larger than 128 GB
  
  - Enable 48-bit LBA Support for Large Hard Drives, from WinGuides Network for Windows
  
  - 48bitLBA.com
  
  - 如何突破137GB的容量限制使用大硬盘