In the DR info Folder look for “AsrBCD.data” file. Open the file in Notepad and look for DiskSize, Values is in Bytes, So you need to convert it to GB or TB.
You can find the DR info folder in the below locations:
1. On the Backup Server:X:\Program Files (x86)\CA\ARCserve Backup\DR
2.On the 'Alternate Location' configured during boot kit creation
3. On the MSD or DR ISO (For ISO you will need to extract the ISO)