VirtualBox: Share VHD Disk between two guests

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We have two VBox guests, one Windows and one Ubuntu. Now we would like to use an additional (encrypted) data disk for both guests at the same time. We created an encrypted exFAT "shareable" VHD disk and added this disk to both guests. It works, the disk is writable from both guests. BUT: if guest A creates a new file or folder, guest B doesn't see it and vice versa. After unmount/mount or restarting the guest, everthing is visible. Why guest A cannot see changes from guest B in realtime? It's working with VDI instead of VHD?

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I think the simplest solution for your problem is to use this shared folder as an network share (nfs/smb share/sftp/ftp..) hosted on your host and connected to both guests as if they were just two computers on the same LAN