I have a MacBook Air new in 2013. Running disk utilities, I came across diskOs4. This showed an error message saying the disk had to be repaired. Trying to repair I get the message that disk utility cannot repair it and I need to back up as many files, reformat the disk and restore the backed up files.
I have subsequently found out that this is part of the Apple SSD Controller. Is it safe to erase this? How would I save files? How would I reformat this?
MacBook Air, iOS 6.1.4
You save files by having a backup. Two widely used methods are Apple's Time Machine, which comes with the OS and/or a clone. Two backups are better that one. You'd reformat it by booting into the Recovery Partition and using Disk Utility/Erase. As to whether or not it is safe, I'll let someone else answer that. I have never seen anything like that.
Clone - Carbon Copy Cloner (Often recommended as it has more features than some others)
Clone Software – 6 Applications Tested
Time Machine Versus Clones and Archives
Thanks Eric. I shall go ahead with your recommendations
You are welcome. Hopefully someone will answer the other question soon.
Hard Drive Issue
