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My MacBook pro mid-2012 has been acting a little odd lately (freezing, losing track of files). I've run first aid in disk utility multiple times, but always get the same notes which suggests it doesn't fix them (see below). I've booted into recovery and disk utility tells me the hard disk is ok and still shows these same results. Are these results anything I should be worried about? Thanks!

Verifying storage system
Performing fsck_cs -n -x --lv --uuid 08DE86D5-A3DC-4538-9A11-42C8C06CC8FE
Checking volume
disk0s2: Scan for Volume Headers
disk0s2: Scan for Disk Labels
Logical Volume Group 08DE86D5-A3DC-4538-9A11-42C8C06CC8FE 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 AAA6EF91-6B7D-4D6C-806C-B24B184671B9
Load and verify 0E445AF6-FF17-41CC-BB25-0BCA0B9662C5
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 08DE86D5-A3DC-4538-9A11-42C8C06CC8FE appears to be OK
Storage system check exit code is 0.
Verifying file system.
Volume could not be unmounted.
Using live mode.
Performing fsck_hfs -fn -l -x /dev/rdisk1
Performing live verification.
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 Macintosh SSD appears to be OK.
File system check exit code is 0.
Restoring the original state found as mounted.
Operation successful.

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    First Aid checks to see if your file system is good. An "exit code" of "0" means everything is good from that perspective. It doesn't check to see if your drive or related hardware is failing (like the SATA cable). What problems are you having exactly? – Allan Mar 25 at 2:51
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This output means that the filesystem check has not found any problems with the drive.

If you're worried about "Volume could not be unmounted", it just means that the file system is in use while you're checking it. It does not mean that anything is wrong with the drive or the file system.

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