Logical Volume Group on main HD?

Discussion in 'OS X Yosemite (10.10)' started by ramparts, May 9, 2015.

  1. ramparts macrumors regular

    Jun 11, 2008
    I'm using a mid-2012 MBP Retina running Yosemite 10.10.3. I ran Verify Disk in Disk Utility on my Macintosh HD and found something I don't understand. Before doing the usual check it examined a "Logical Volume Group" with the funny name 3E197EA7-DF19-4313-A587-E0713CAB61DB:

    Verifying volume “Macintosh HD”
    Verifying storage system
    Checking volume
    disk0s2: Scan for Volume Headers
    disk0s2: Scan for Disk Labels
    Logical Volume Group 3E197EA7-DF19-4313-A587-E0713CAB61DB on 1 device
    disk0s2: Scan for Metadata Volume
    Logical Volume Group has a 24 MB Metadata Volume with double redundancy
    Start scanning metadata for a valid checkpoint
    Load and verify Segment Headers
    Load and verify Checkpoint Payload
    Load and verify Transaction Segment
    Incorporate 0 newer non-checkpoint transactions
    Load and verify Virtual Address Table
    Load and verify Segment Usage Table
    Load and verify Metadata Superblock
    Load and verify Logical Volumes B-Trees
    Logical Volume Group contains 1 Logical Volume
    Load and verify 13BE1B8D-4F3E-41D2-8BBF-D74BA42B76D9
    Load and verify F7C09161-E6C4-4550-A070-878CF5B6D48D
    Load and verify Freespace Summary
    Load and verify Block Accounting
    Load and verify Live Virtual Addresses
    Newest transaction commit checkpoint is valid
    Load and verify Segment Cleaning
    The volume 3E197EA7-DF19-4313-A587-E0713CAB61DB appears to be OK

    Is this normal?
  2. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    Yep... totally normal. On newer portables Yosemite turns the drive into a Core Storage volume and assigns a UUID to the volumes. That UUID number is what you are seeing there.

    If you run the command below in Terminal it will display the core storage volume layout with the UUIDs.

    diskutil cs list
  3. ramparts thread starter macrumors regular

    Jun 11, 2008

Share This Page