By default Boot.ini is ensigned as a read-only system file and shouldn’t need any manual alteration. Windows (particularly Ntldr) utilizes the Boot.ini file to resolve the operating system preference to view during the boot (startup) procedure. To modify the contents of this file simply, employ the System tool in Control Panel.

The following is a typical Boot.ini file:

[boot loader] timeout=30 default=scsi(0)disk(0)rdisk(0)partition(1)\winnt
[operating systems] scsi(0)disk(0)rdisk(0)partition(1)\winnt = "Windows NT" /NODEBUG C:\ = "Previous Operating System on C:\"

The following method explains the data in the foregoing Boot.ini file:

• "Timeout" specifies the amount of time Windows waits before choosing the default operating system
• "Default" specifies the default operating system.
NOTE: When the operating system is Windows NT, the new storage path syntax is used. For more information on this syntax, query on the following words in the Microsoft Knowledge Base:
* NT
* GEOMETRY

• "Scsi(0)" means that the primary controller (usually the only one) is responsible for the device. If there were two SCSI cards and the disk was hanging off the second one, it would be named "scsi(1)".

NOTE: If the system uses IDE, EIDE, ESDI drives, or a SCSI adapter with no built in BIOS replace "SCSI" with "Multi".

• "disk(0)" refers to physical disk 1.
• The rdisk() parameter refers to which SCSI logical unit (LUN) to use, which could be a separate disk, but the vast majority of SCSI setups have only one LUN for each SCSI ID.
• "Partition(1)" in this example is the only partition on the first drive in the computer. If there were two partitions, C and D, C would be partition(1) and D would be partition(2).
• Multi-boot will look at the \Winnt folder to boot from one of the specified SCSI card's disk and partition.
• /NODEBUG specifies that there's no debugging information being monitored. Debugging information is only useful for developers and does slow down Windows NT.
• The /SOS switch can be added to display driver names while they are being loaded during the Windows boot. By default, the OS Loader screen only echos progress dots.
• The "Previous Operating System on C:\" parameter implies that it is MS-DOS, because "C:\" is an MS-DOS path.