Cannot mount the backup image.

I have 7 volume of backup image which is for an 2TB HDD
[Vol1: 2TB ; Vol2: 306MB ; Vol3: 227MB ; Vol4: 239MB ; Vol5: 40.5MB ; Vol6: 5.28MB ; Vol7: 23.4MB]

Vol1 store in a HDD and Vol2~6 store in another HDD (originally it was split into several media)

I'm able to explorer the image (double click of mouse) and validate it successfully, but when I mount the drive, ATIH prompt this msg : "Specify where is the Vol.1" and it let me browse it so it can know where I put the first volume.
But after I browse it, the msg still here, and press "retry" cannot help with the problem.

So how can I do? Since I'm unable to buy another HDD that's over than 2TB, putting all volume in the same HDD is impossible.