My Bootcamp partition disappeared after the Yosemite update, in place a partition named disk0s4 appeared. Can someone guide me in recovering this partition?
MacBook Pro, OS X Mountain Lion (10.8.3), Lost Partition
Very efficient Spotlight index, Kappy. Very 😎.
Leave your Testdisk display? and start a new Terminal Window. Please use the following steps... i'm not sure where i'm supposed to start, but it looks like i need values from test disk to proceed on. I tried typing Test disk in terminal but it's not a command. Do i test disk from disk utility?
Please download
1. Testdisk from http://www.cgsecurity.org/wiki/TestDisk_Step_By_Step.
2. GPT Fdisk (aka Gdisk) from http://sourceforge.net/projects/gptfdisk/
3. Start Testdisk scan using https://imgur.com/a/PjmnK as a Guide.
Please post the output of the following Terminal commands for recording purposes, before any changes are made.
diskutil list
diskutil cs list
Sudo needs your password, which is not echoed back to you. It may warn you about improper use and data loss due such abuse.
There are two sudo commands in similar threads, which ASC is not allowing me to post again. They show the GPT and MBR (Fdisk /dev/disk0)
MacBookPros-MacBook-Pro:~ Mac$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage 400.5 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
4: Microsoft Basic Data 80.0 GB disk0s4
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD *400.1 GB disk1
Logical Volume on disk0s2
5CDEF809-569E-43D4-A28B-F14ABB3CA63E
Unencrypted
I don't know if Loner agrees with me on this, but I would:
Open Terminal and paste this line:
sudo diskutil cs revert /dev/disk1
Press RETURN, enter your admin password when prompted, press RETURN, again.
Reboot the computer. This should return the disk layout to HFS+.
i'll wait to see what you both agree on, thanks for the help.
For some obscure reason (perhaps due to the spamming of the ASC all day today), I am unable to post the following request
Can you post the output of the GPT command as shown in the other threads?
Even if OP reverts the disk to HFS+, if there is an issue with the GPT due a partition gap, it may not help in finding it. The CS vs HFS+ approach makes more sense if there is a partition re-sizing attempt which does not work in Yosemite due to a broken Disk Utility.
Last login: Wed Apr 1 23:31:23 on ttys001
MacBookPros-MacBook-Pro:~ Mac$ Sudo gdisk /dev/rdisk0
Password:
GPT fdisk (gdisk) version 1.0.0
Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Warning! Disk size is smaller than the main header indicates! Loading
secondary header from the last sector of the disk! You should use 'v' to
verify disk integrity, and perhaps options on the experts' menu to repair
the disk.
Caution: invalid backup GPT header, but valid main header; regenerating
backup header from main header.
Warning! Error 16 reading partition table for CRC check!
Warning! One or more CRCs don't match. You should repair the disk!
Partition table scan:
MBR: hybrid
BSD: not present
APM: not present
GPT: damaged
Found valid MBR and corrupt GPT. Which do you want to use? (Using the
GPT MAY permit recovery of GPT data.)
1 - MBR
2 - GPT
3 - Create blank GPT
Your answer:
im not sure if this is the gpt command, if so do i type 2?
I prefer 2. It will try and correct the CRC errors and resurrect the GPT, if possible. The Gdisk command does this, but the native Apple GPT command does not.
The GPT command will show the gap, while Gdisk does not.
Run the GPT command as shown https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/ man8/gpt.8.html.
Command (? for help): 2
b back up GPT data to a file
c change a partition's name
d delete a partition
i show detailed information on a partition
l list known partition types
n add a new partition
o create a new empty GUID partition table (GPT)
p print the partition table
q quit without saving changes
r recovery and transformation options (experts only)
s sort partitions
t change a partition's type code
v verify disk
w write table to disk and exit
x extra functionality (experts only)
? print this menu
Type 'v'.
Caution: The CRC for the backup partition table is invalid. This table may
be corrupt. This program will automatically create a new backup partition
table when you save your partitions.
Problem: The secondary header's self-pointer indicates that it doesn't reside
at the end of the disk. If you've added a disk to a RAID array, use the 'e'
option on the experts' menu to adjust the secondary header's and partition
table's locations.
Problem: Disk is too small to hold all the data!
(Disk size is 976773123 sectors, needs to be 976773168 sectors.)
The 'e' option on the experts' menu may fix this problem.
Problem: GPT claims the disk is larger than it is! (Claimed last usable
sector is 976773134, but backup header is at
976773167 and disk size is 976773123 sectors.
The 'e' option on the experts' menu will probably fix this problem
Identified 4 problems!
My Bootcamp partition disappeared after the Yosemite update.
