I have backup on disk, I have set my tape size to 10TB to avoid problems

When the first backup is done it's generates a big file of 2TB of the full backup 00001.srv-test-01._rep_grp.0
The incremental is small like 300M

The problem is that to recovery any file looks like amanda read the entire full dump, this takes hours because it is a 2TB file

I want to speed up the recovery process

If I create a tape size smaller that forces amanda to create various small parts of the full backup will amanda jump over directly to the part that has the file or it will read all the files the same way?

Is there any way to speed up the process?