~ admin$ diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 23C899E4-9DC5-49CE-AE44-B6DBEE6A8E79
    =========================================================
    Name:         Seagate Backup Plus Drive
    Size:         999860912128 B (999.9 GB)
    Free Space:   16777216 B (16.8 MB)
    |
    +-< Physical Volume 80AAFDE0-7522-48D4-851F-3BB6BC0F6C28
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk1s2
    |   Status:   Online
    |   Size:     999860912128 B (999.9 GB)
    |
    +-> Logical Volume Family 10E44725-802C-47A2-B7FE-FC022BE4E1DB
        ----------------------------------------------------------
        Encryption Status:       Unlocked
        Encryption Type:         AES-XTS
        Conversion Status:       Converting
        Conversion Direction:    forward
        Has Encrypted Extents:   Yes
        Fully Secure:            No
        Passphrase Required:     Yes
        |
        +-> Logical Volume BE4CEC7E-B8FA-4945-8C87-2C26622B3277
            ---------------------------------------------------
            Disk:               disk2
            Status:             Online
            Size (Total):       999525363712 B (999.5 GB)
            Size (Converted):   38616956928 B (38.6 GB)
            Revertible:         Yes (unlock and decryption required)
            LV Name:            Seagate Backup Plus Drive
            Volume Name:        Seagate Backup Plus Drive
            Content Hint:       Apple_HFS