Hi,
unfortunately the maximum virtual disk size for a VM is 2 TB - 512 Byte. In you Case it would be suitable to create two or three seperate virtual disks and combine them (RAID 0 or concatenate disks). Another way (IMHO the besser way) is to create multiple virtual disks and mount them using NTFS mountpoints.
An example:
D:\Data is a folder on a single virtual disks. Create a second virtual disks and create the folder C:\Data\Data2. Instead of assigning a drive letter to the newly created disk, you can mount it into the folder Data2. This gives you the possibility to move the biggest folders onto seperate virtual disks drives without losing you folder structure.
Regards,
Patrick