For a BartPE-CD I need the driver file iastor.sys, but I can't find it neither on Intel's download site nor elsewhere on the internet.
Can anybody point me in the right direction?
This is part of Intel storage driver, you can get it here:
You want the 'Floppy Configuration Utility', either 64 or 32 depending on your requirements. You can just unzip this one, and iastor.sys should be right there :)
Hope this helps!
iastor.sys is for Intel's Matrix Storage driver. Intel mentions that you can download IATA88ENU.EXE from Intel, extract files from package which contains the the iastor.sys (albeit for an unattended install).