I would like to automate MSI patch generation. Our build needs is the next DiskId and LastSequence (or SequenceStart as input. They can be read from the table Media with the orca.exe tool and "Transform -> View Patch": 
I found this powershell and this post on how to extract values from MSI/MSP files, however, it seems the LastSequence can only be obtained by opening MSI and MSP file together in orca. How can I read this value automatically (with Powershell preferably)?