Here's the output. Thanks for all your help and patience!
Last login: Tue Mar 6 19:00:15 on ttys000
Ben:~ jtembley$ sudo tmutil listlocalsnapshots /
Password:
listlocalsnapshots: Unrecognized verb.
Ben:~ jtembley$ diskutil repairDisk disk0
Repairing the partition map might erase disk0s1, proceed? (y/N) y
Started partition map repair on disk0
Checking prerequisites
Checking the partition list
Adjusting partition map to fit whole disk as required
Checking for an EFI system partition
Checking the EFI system partition's size
Checking the EFI system partition's file system
Checking the EFI system partition's folder content
Checking all HFS data partition loader spaces
Checking booter partitions
Checking booter partition disk0s3
Verifying file system
Checking Journaled HFS Plus volume
Checking extents overflow file
Checking catalog file
Checking multi-linked files
Checking catalog hierarchy
Checking extended attributes file
Checking volume bitmap
Checking volume information
The volume Recovery HD appears to be OK
File system check exit code is 0
Reviewing boot support loaders
Checking Core Storage Physical Volume partitions
Verifying storage system
Checking volume
disk0s2: Scan for Volume Headers
disk0s2: Scan for Disk Labels
Logical Volume Group F6F6ADF7-F308-45A9-A963-9C36D915FAA0 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 4B411AEC-1AD0-4A90-ACF8-25A2E901A7BA
Load and verify 905CB1ED-D824-4B97-8C56-9D33288B9611
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 F6F6ADF7-F308-45A9-A963-9C36D915FAA0 appears to be OK
Storage system check exit code is 0
Repairing storage system
The volume disk0s2 cannot be repaired when it is in use
Checking volume
disk0s2: Scan for Volume Headers
disk0s2: Scan for Disk Labels
Logical Volume Group F6F6ADF7-F308-45A9-A963-9C36D915FAA0 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 4B411AEC-1AD0-4A90-ACF8-25A2E901A7BA
Load and verify 905CB1ED-D824-4B97-8C56-9D33288B9611
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 F6F6ADF7-F308-45A9-A963-9C36D915FAA0 appears to be OK
Storage system check exit code is 0
Updating Windows boot.ini files as required
The partition map appears to be OK
Finished partition map repair on disk0
Ben:~ jtembley$
