VHD Difference Between VPC and VS

Is there any significant difference between VHDs in the Virtual PC and
Virtual Server environments?  In other words, if a VHD was created and used
under VPC, could it then be used as-is in a Virtual Server environment?  And
what about the other way around, if a VHD was created and used under Virtual
Server - could it be used as-is under Virtual PC?

Thanks

They are compatible except when it comes to specific device support.

They are compatible except when it comes to specific device support.

For example, you can install an OS inside VPC which uses sound. The same VHD
will boot under VS but there will not be a sound device so the sound driver
will not load and there will be no sound.

VS supports SCSI which lets it support very large VHD files. VPC does not
support SCSI, so if a VHD file is too large for the IDE implementation in
VPC, you wouldn't be able to mount it. Otherwise, there is no difference in
VHD format for SCSI vs. IDE, so as long as the VHD is small enough for IDE,
you can mount it as either SCSI or IDE under VS and mount it as IDE under
VPC, regardless of how/where it was originally created.

There is a version inside the VHD but it does not interfere with moving VHD
files between any recent or current version of VPC/VS. This is not to be
confused with the version inside a VMC which can cause a warning message to
be displayed but generally does not otherwise prevent moving virtual
machines around.

Keep in mind that if your VHD contains software requiring activation, moving
it could (especially when combined with other changes like modifying the
memory size in a corresponding VMC) trigger re-activation.

VHD Difference Between VPC and VS

Thanks Ronny.  What a great post!