Portlock Leap Frog: Limitations Portlock Leap Frog: Limitations Portlock Leap Frog does NOT support creating a bootable VHD on a USB drive. Only Windows 7 Ultimate/Enterprise and Windows Server 2008 R2 are supported VHD platforms for Windows install. Bitlocker does NOT support Windows 7 when running from VHD. Operating systems booted from a VHD do NOT support hibernation. VHDs that have been compressed are NOT supported by native boot. You can only attach a VHD that is located on an NTFS volume. 2 TB (2048 GB) limit on VHD size. Systems that dual-boot with Linux are NOT supported. Portlock Leap Frog does not support creating VHDs on a destination volume that is located on a Windows Dynamic Disk.