Setup Does Not Check for INT-13 Extensions Before Creating System Partition

• Microsoft Windows 2000 Advanced Server
• Microsoft Windows 2000 Datacenter Server
• Microsoft Windows 2000 Professional
• Microsoft Windows 2000 Server

SYMPTOMS

When you install Windows 2000, Setup allows you to delete, create, and format the system/boot partition. Windows 2000 does not impose any restriction on the size of the system/boot partition because it can format the partition using the FAT file system (up to 2 gigabytes, or GB), the FAT32 file system (up to 32 GB) or the NTFS file system (up to 2 terabytes) before copying the Setup files.

The system partition is defined as the partition containing the files needed for the initial system startup. For Windows 2000, these are the Ntdetect.com, NTLDR, Boot.ini, and sometimes Ntbootdd.sys files.

Windows 2000 supports large system partitions because it has the ability to use BIOS INT-13 extensions to boot the operating system on partitions with more than 1,024 cylinders, or 7.8 GB in size. After Windows 2000 Setup copies files, it restarts the computer to continue with GUI-mode Setup.

During the restart, you may receive the following error message after the computers completes its Power On Self Test (POST):

A disk read error occurred.
Press Crtl+Alt+Del to restart.

CAUSE

Windows 2000 Setup does not determine BIOS INT-13 extensions are enabled or available for use before allowing the creation of a system partition with more than 1,024 cylinders, or typically larger than 7.8 GB.

If you have a SCSI controller with options for drive translation disabled, and INT-13 extensions are disabled in the SCSI BIOS, the drive's geometry is then native, or raw. This means that the partition table contains non-translated Cylinder, Head, and Sector (CHS) values and may need to rely on the INT-13 extensions to boot the operating system. If the system partition is large and cannot be described within the partition table's upper limit of 1,023 cylinders, INT-13 extensions must be used to boot from the partition.

RESOLUTION

Enable the INT-13 Extensions option in the SCSI controller's BIOS. This allows Windows 2000 to boot and continue with GUI-mode Setup. If your SCSI controller does not support INT-13 extensions, you are bound by the restriction outlined in the following article in the Microsoft Knowledge Base:

Q224526 Windows NT 4.0 Supports Maximum of 7.8-GB System Partition

STATUS

Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

You may be able to create a Windows 2000 boot floppy disk using scsi() syntax in the Boot.ini file to continue Setup. This only provides a temporary solution, and you should investigate in more detail why the computer cannot boot from the system partition on its own.

For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

Q119467 Creating a Boot Disk for an NTFS or FAT Partition

Additional query words: INT13 EXT

Keywords : kberrmsg kbsetup
Version : WINDOWS:2000
Platform : WINDOWS
Issue type : kbprb