I'm a little bit confused, maybe you can clarify what exactly you are doing and at which step you have problems.
In your previous post you said "... now that I've increased the disk size from 60gb to 90gb I can no longer open the disk in vi", but now it seems you are still trying to figure out how to increase the virtual disk. Anyway, what you may edit to "convert" the IDE disk to SCSI it the header/descriptor .vmdk file, which should only be a few hundred bytes in size, independent of it's associated data (...-flat.vmdk) file.
André