Q: Mac OS Extended (Journaled, Encrypted)

Hi All,

I am new to Mac and the format of the OS on my new retina MBP says Mac OS Extended (Journaled, Encrypted). Please can you let me know what this exactly means?

I recently enabled FileVault encryption which completed with the below results

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.3 GB   disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:          Apple_CoreStorage Macintosh HD            499.4 GB   disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

/dev/disk1 (internal, virtual):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                  Apple_HFS Macintosh HD           +499.1 GB   disk1

                                 Logical Volume on disk0s2

                                 14A056A9-7E4D-4FC4-9EC9-1FAE47BB1E0B

                                 Unlocked Encrypted

CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group 34CADFD4-A008-4B82-8F27-FD277D77EEE2

    =========================================================

    Name:         Macintosh HD

    Status:       Online

    Size:         499418034176 B (499.4 GB)

    Free Space:   32768 B (32.8 KB)

    |

    +-< Physical Volume 9E2A59ED-5EC0-47BD-BF50-D9C554BB826D

    |   ----------------------------------------------------

    |   Index:    0

    |   Disk:     disk0s2

    |   Status:   Online

    |   Size:     499418034176 B (499.4 GB)

    |

    +-> Logical Volume Family 30CF0D57-0632-477C-8DD2-03FCCF6CFA14

        ----------------------------------------------------------

        Encryption Type:         AES-XTS

        Encryption Status:       Unlocked

        Conversion Status:       Complete

        High Level Queries:      Fully Secure

        |                        Passphrase Required

        |                        Accepts New Users

        |                        Has Visible Users

        |                        Has Volume Key

        |

        +-> Logical Volume 14A056A9-7E4D-4FC4-9EC9-1FAE47BB1E0B

            ---------------------------------------------------

            Disk:                  disk1

            Status:                Online

            Size (Total):          499055067136 B (499.1 GB)

            Conversion Progress:   Complete

            Revertible:            Yes (unlock and decryption required)

            LV Name:               Macintosh HD

            Volume Name:           Macintosh HD

            Content Hint:          Apple_HFS

Has the format changed to Extended (Journaled, Encrypted) post this operation or is this the default OS format that ships with all Mac Books?

Also, I had customised this with 512GB Flash Storage but the info only shows 500. Is this normal and the difference (from what's actually stated) common across all capacities or only with 512? Please let me know.

Thanks in advance.