How to Determine the ARC Path

ID: Q155222

The information in this article applies to:

Microsoft Windows NT Workstation version 4.0
Microsoft Windows NT Server version 4.0

SUMMARY

When you troubleshoot some issues where a Windows NT boot disk is needed, you may need the ARC path for the Boot.ini file. However, it may not be obvious, or the machine administrator may not remember the partition or root directory the operating system was installed in. This information can be recovered from the Emergency Repair Disk.

MORE INFORMATION

The Setup.log file is located on the Emergency Repair Disk. It has the system, hidden, and read-only attributes. If this file is opened in a text editor, the first few lines will provide information about how to build the ARC path to the operating system. The following is an excerpt from a typical Setup.log file.


   [Paths]
   TargetDirectory = "\WINNT"
   TargetDevice = "\Device\Harddisk0\partition2"
   SystemPartitionDirectory = "\"
   SystemPartition = "\Device\Harddisk0\partition1"

A typical ARC path might be:


   multi(0)disk(0)rdisk(0)partition(2)\WINNT="My Server 4.0"

The rdisk parameter is defined as Harddisk<X> on the TargetDevice line, where <X> is a variable that represents the drive ordinal. Note that the rdisk parameter is not used when SCSI replaces multi in the ARC path.

The partition parameter is defined as partition<X> on the TargetDevice line, where <X> is a variable that represents the partition ordinal. Note also that SystemPartition refers to the partition where NTLDR is stored. Use TargetDevice for the partition ordinal value.

The TargetDirectory line defines the system root directory, which is the part of the ARC path immediately following the partition number.

For more information, please see the following articles in the Microsoft Knowledge Base:

ARTICLE-ID: Q119467
TITLE : Creating a Boot Disk for an NTFS or FAT Partition

ARTICLE-ID: Q102873
TITLE : Boot.ini and ARC Path Naming Conventions and Usage

ARTICLE-ID: Q130921
TITLE : Creating an FT Boot Disk With SCSI() and Multi() Identifiers

ARTICLE-ID: Q139333
TITLE : Creating Alternate Boot Selections on AXP Machines

Additional query words: RISC prodnt

Keywords : kbnetwork nthowto ntfilesys NTSrvWkst
Version : winnt:4.0
Platform : winnt
Issue type : kbhowto