How do I install a service pack during a unattended installation?

A. There are various options, however all of them requirefor the service pack to be extracted to a directory, using

NT4SP3_I /x

and you then enter the directory where you want to extract to.

You could extract to a directory under the $OEM$ installation directorywhich would then be copied locally during the installation and you could addthe line

".UPDATE.EXE -U -Z"

to CMDLINES.TXT. This will increase the time of the text portion of theinstallation as the contents have to be copied over the network.

With Service Pack 4 you could just add and not need to expand the servicepack first.

[Commands]
".sp4sp4i386.exe -z -u"

Simply create a folder called sp4 under $OEM$ and copy sp4i386.exe to it.

If using the above you should ensure you have the following inunattended.txt

[Unattended]
OemPreinstall=yes

An alternate method is to install from a network drive, this requires a bitmore work: