Q: OS X El Cap startup - prohibited symbol
I'm having an issue with my Mac. I have a Samsung SSD 840 Evo 1TB in my MacBook Pro (13-inch, Mid 2010). I've only had the SSD in it for a few years now. The SSD and the memory are the only upgrades I have done (upgraded to 8GB RAM within a few months of ownership and to the SSD 2-3 years ago).
I do use FileVault 2 (I work with sensitive client information).
Last night I resumed my computer from sleep (open screen, wake up, login). Only to close my Spotify and the screen froze and become completely unresponsive (clock was not flashing, could not change dim on keyboard, cursor would not move, etc) - so after about 20 minutes I decided it was time to force it off and turn it back up, it presented the normal login screen showing my name and the guest account. Clicking into my account and entering my password, it starts its usual loading process, gets to about halfway.. but then shows the prohibited symbol.
After booting into Internet Recovery I was able to check the drive and do some basic checks and it was saying disk0s2 was not a CoreStorage volume.
So I switched back to my old (and slow) hard drive (10.10.1 is on this) and mounted the SSD separately using a sata2usb connector, and ran a repair and got back this - the same errors I got on the Internet Recovery:
Verifying and repairing partition map for “Samsung SSD 840 EVO 1TB Media”
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 all HFS data partition loader spaces
Checking booter partitions
Checking booter partition disk3s3
Repairing 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.
Updating boot support partitions for the volume as required.
Reviewing boot support loaders
Checking Core Storage Physical Volume partitions
Verifying storage system
Checking volume
disk3s2: Scan for Volume Headers
disk3s2: Scan for Disk Labels
Invalid Disk Label @ 999328231424: bad MLV address
Invalid Disk Label @ 999332425728: invalid field value
Invalid Disk Label @ 999336620032: cksum mismatch
Invalid Disk Label @ 999340814336: invalid field value
disk3s2 is not a CoreStorage volume
Storage system check exit code is 1.
Repairing storage system
Checking volume
disk3s2: Scan for Volume Headers
disk3s2: Scan for Disk Labels
Invalid Disk Label @ 999328231424: bad MLV address
Invalid Disk Label @ 999332425728: invalid field value
Invalid Disk Label @ 999336620032: cksum mismatch
Invalid Disk Label @ 999340814336: invalid field value
disk3s2 is not a CoreStorage volume
Storage system check exit code is 1.
Repairing storage systemChecking volume
disk3s2: Scan for Volume Headers
disk3s2: Scan for Disk Labels
Invalid Disk Label @ 999328231424: bad MLV address
Invalid Disk Label @ 999332425728: invalid field value
Invalid Disk Label @ 999336620032: cksum mismatch
Invalid Disk Label @ 999340814336: invalid field value
disk3s2 is not a CoreStorage volume
Storage system check exit code is 1.
Problems were encountered during repair of the partition map
Error: This disk needs to be repaired. Click Repair Disk.
Executing "Repair Disk" gives back the same information.
From what I've seen on the internet already here is some information that may help:
% diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *750.2 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_HFS Macintosh 701.3 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 4: Microsoft Basic Data BOOTCAMP 48.0 GB disk0s4 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *8.0 GB disk1 1: DOS_FAT_32 NO NAME 8.0 GB disk1s1 /dev/disk3 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk3 1: EFI 209.7 MB disk3s1 2: Apple_CoreStorage 999.3 GB disk3s2 3: Apple_Boot Recovery HD 650.1 MB disk3s3 % diskutil cs list CoreStorage logical volume groups (1 found) | +-- Logical Volume Group D9884BF5-CC85-4359-B567-B05FE28189C5 ========================================================= Name: -none- Status: Initializing Size: 0 B (0 B) Free Space: -none- | +-< Physical Volume 86EBE82F-BD40-4021-BE68-A8B41920E177 ---------------------------------------------------- Index: 18446744073709551615 Disk: disk3s2 Status: Failed Size: -none- % diskutil cs unlockVolume /dev/disk3s2 % diskutil cs unlockVolume disk3s2 % diskutil cs unlockVolume D9884BF5-CC85-4359-B567-B05FE28189C5 % diskutil cs unlockVolume 86EBE82F-BD40-4021-BE68-A8B41920E177 # all of the above give the same response: xxx is not a CoreStorage Logical Volume UUID % diskutil cs info /dev/disk3s2 Core Storage Properties: Role: Physical Volume (PV) UUID: 86EBE82F-BD40-4021-BE68-A8B41920E177 Parent LVG UUID: D9884BF5-CC85-4359-B567-B05FE28189C5 Device Identifier: disk3s2 PV Status: Failed % sudo fsck_cs /dev/disk3s2 Password: Executing fsck_cs (version 471) ** Checking volume ** disk3s2: Scan for Volume Headers ** disk3s2: Scan for Disk Labels Invalid Disk Label @ 999328231424: bad MLV address Invalid Disk Label @ 999332425728: invalid field value Invalid Disk Label @ 999336620032: cksum mismatch Invalid Disk Label @ 999340814336: invalid field value ** disk3s2 is not a CoreStorage volume
I'm really regretting not backing up for a few weeks now, as there is a lot of work on this SSD I would like to have back!
I can mount my Recovery HD and the EFI volumes:
% diskutil mount /dev/disk0s3 Volume Recovery HD on /dev/disk0s3 mounted % diskutil mount /dev/disk0s1 Volume EFI on /dev/disk0s1 mounted
Now I'm not sure what to do.
MacBook Pro, OS X El Capitan (10.11.6)
Posted on Sep 15, 2016 7:17 PM