Density support data block descriptors
  descriptor 1
    Primary density code: 68
    Secondary density code: 68
    WRT: 0
    DUP: 0
    DEFLT: 0
    DLV: 0
    Bits per mm: 9638
    Media width: 127
    Tracks: 704
    Capacity: 400000
    Assigning organization: LTO-CVE 
    Density name: U-316   
    Description: Ultrium 3/16T       
  descriptor 2
    Primary density code: 70
    Secondary density code: 70
    WRT: 1
    DUP: 0
    DEFLT: 0
    DLV: 0
    Bits per mm: 12725
    Media width: 127
    Tracks: 896
    Capacity: 800000
    Assigning organization: LTO-CVE 
    Density name: U-416   
    Description: Ultrium 4/16T       
  descriptor 3
    Primary density code: 88
    Secondary density code: 88
    WRT: 1
    DUP: 0
    DEFLT: 1
    DLV: 0
    Bits per mm: 15142
    Media width: 127
    Tracks: 1280
    Capacity: 1500000
    Assigning organization: LTO-CVE 
    Density name: U-516   
    Description: Ultrium 5/16T