Linked Questions

8 votes
1 answer

How to fix GUID hard drive corrupted to MBR

I am on OS X 10.9.5 with a late 2013 iMac. I have a 3TB hard drive that has an unusual problem. It is a Western Digital 3TB Red WD30EFRX. I formatted it with two partitions, both 1.5TB. One was a ...
junkelly's user avatar
4 votes
2 answers

Rebuild partition table on external HDD - not writable

I have an external hard drive formatted with 3 HFS+ partitions. To cut a long story short I had it connected to a Windows PC and accidentally started formatting the drive to NTFS. As soon as I ...
dobestar's user avatar
  • 141
4 votes
2 answers

Partition map rebuild

I have an external hdd that doesn't mount anymore. I think I screw up with all the research I done and things I try. I have vital info on this hdd and I'm really afraid to lose it. I tried this: ...
Dani's user avatar
  • 67
1 vote
1 answer

Missing Mac partitions - unrecognized file system

Apparently, I installed Windows 7 via bootcamp and created a new partition in Windows (which probably affected the partition table). After restart, I can't see Macintosh HD in startup disk (it only ...
JoshuaTang's user avatar
3 votes
1 answer

Partition on HFS+ external drive: "Invalid number of allocation blocks", file system check exit code 8. Unable to repair, even in recovery mode

As the title says, I'm getting the error "Invalid number of allocation blocks" on a particular HFS+ partition of an external drive. I am unable to repair, even in recovery mode. Log results when I ...
Jon B's user avatar
  • 127
2 votes
1 answer

Accidentaly converted from a basic disk to a dynamic one

I got a MacBook Pro (13-inch late 2013 retina) So I installed Windows 7 using bootcamp and all was fine. I then needed to create a 32MB FAT16 partition, when Windows prompted me to convert to a ...
user167173's user avatar
-2 votes
1 answer

Hardrive will not mount after deleting Linux partition. Can’t boot into Mac OS X [duplicate]

I tried to delete a Linux partition on my hard drive. My hard drive was no longer bootable and the type turned into FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF. I tried to follow some of the other ...
Rahul Ravisankar's user avatar
1 vote
0 answers

Invalid number of allocation blocks in Disk Utility Repair

First of all I hope @klanomath is still active over here as I'm having a similar issue as described in following thread: Partition on HFS+ external drive: "Invalid number of allocation blocks&...
Kimme's user avatar
  • 11
3 votes
1 answer

Remove Linux partition on Mac. CoreStorage problems

I have a Macbook pro 2015 with a 256 GB SSD and a Linux partition. I would like to remove the partition. Following the steps written in here, I got stuck in the Modify step. Once I execute the command ...
Alex C.'s user avatar
  • 31
1 vote
1 answer

My whole startup disk has gone blank

After a botched arch Linux install, my whole ssd got wiped. I used a bootable USB drive for Ubuntu to see what happened and saw that all my partitions from the SSD had vanished and the drive was ...
user2758186's user avatar