Some context first: I have late 2012 iMac 27" with 1TB fusion drive. Some time ago, for whatever reason, the SSD drive became visible in Disk Utility. I happily used the drive for Yosemite and bootcamp. After some time, for whatever reason, booting became sluggish, so I've reset PRAM. Booting sped up, but SSD went into hiding again, leaving me with no OS. I'd like to go back to the setup with the visible SSD, but I don't know how.
Here are diskutil and gpt outputs:
~ ❯❯❯ diskutil cs list No CoreStorage logical volume groups found ~ ❯❯❯ diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: *0 B disk0 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk1 1: EFI 209.7 MB disk1s1 2: Apple_HFS mac 32.0 GB disk1s2 3: Apple_HFS home 20.0 GB disk1s3 4: Apple_HFS data 697.9 GB disk1s4 5: Apple_HFS WIN_DATA 249.6 GB disk1s5
I think disk0 is the SSD, but why does it have 0B size?
~ ❯❯❯ sudo gpt -vv -r show /dev/disk0 gpt show: unable to open device '/dev/disk0': Operation not supported by device ~ ❯❯❯ sudo gpt -vv -r show /dev/disk1 gpt show: /dev/disk1: mediasize=1000204886016; sectorsize=512; blocks=1953525168 gpt show: /dev/disk1: PMBR at sector 0 gpt show: /dev/disk1: Pri GPT at sector 1 gpt show: /dev/disk1: Sec GPT at sector 1953525167 start size index contents 0 1 PMBR 1 1 Pri GPT header 2 32 Pri GPT table 34 6 40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B 409640 62500000 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC 62909640 262144 63171784 39062496 3 GPT part - 48465300-0000-11AA-AA11-00306543ECAC 102234280 262144 102496424 1363009592 4 GPT part - 48465300-0000-11AA-AA11-00306543ECAC 1465506016 262144 1465768160 487494824 5 GPT part - 48465300-0000-11AA-AA11-00306543ECAC 1953262984 262151 1953525135 32 Sec GPT table 1953525167 1 Sec GPT header
I tried reinstalling the OS (now I'm using MAC OS 10.8) and formatting the whole disk1, but to no avail. Can someone please help me?
Following @agentroadkill advice I tried the method from 'How to fix deep formatting problems with OS X drives' article. I remember that I tried this method earlier, before posting the question here, and the results were different than described in the article - the /dev/random output was directed to the console then. I don't remember in which boot mode I was in back then. Anyway, I tried it again:
In normal boot mode and in recovery mode:
sh-3.2# cat /dev/random > /dev/disk0 cat: stdout: Device not configured
In single-user mode:
:/ root# cat /dev/random > /dev/disk0 disk0: media is not formatted. 0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [ErrType IO] [ErrNo 6] [IOType Read] [PBlkNum 0] [LBlkNum 0] [FSLogMsgID 701182122] [FSLogMsgOrder First] 0 [Level 3] [ReadUID 0] [Facility com.apple.system.fs] [DevNode devfs] [MountPt /dev] [Path /dev/disk0] [FSLogMsgID 701182122] [FSLogMsgOrder Last] cat: stdout: Device not configured