What PC-specific information does Windows 7 put into its System Repair Disk that would make it machine-specific? I know the backup image that you create is machine dependent. I have been treating the System Repair Disk as a generic CD, similar to a retail Windows 7 media disk and just had a problem (the CD wouldn't boot, BIOS/EFI issue) because of this. I got it fixed but it was hair-raising, and I am also having some other odd things that may be because of this.
Does Microsoft document this somewhere, Is there best practices regarding system repair disks? For example, do you keep a disk for each PC, etc?