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<blockquote data-quote="cgalloway" data-source="post: 1741263" data-attributes="member: 386496">I have a late 2013 imac with a 1TB Fusion drive.A while ago I had problems in starting up. Basically, the machine would not boot unless I chose a non-SSD route on pressing the option key. Running disk utility told me: &quot;first aid found corruption that needs to be repaired. to repair the startup volume, run first aid from recovery.&quot;I didnt pursue this because I was busy at the time. Coming back to it now, however, I cant find the SSD drive at all. I realise this is normal in disk utility, but I can find no sign of it anywhere else either. In terminal I get this: /dev/disk0 (internal, physical):&nbsp;&nbsp; #:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; TYPE NAME&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SIZE&nbsp; &nbsp; &nbsp;&nbsp; IDENTIFIER&nbsp;&nbsp; 0:&nbsp; &nbsp; &nbsp; GUID_partition_scheme&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; *1.0 TB&nbsp; &nbsp;&nbsp; disk0&nbsp;&nbsp; 1:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; EFI EFI&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 209.7 MB&nbsp;&nbsp; disk0s1&nbsp;&nbsp; 2:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Apple_HFS Apple Fusion HDD&nbsp; &nbsp; &nbsp; &nbsp; 999.9 GB&nbsp;&nbsp; disk0s2/dev/disk1 (external, physical):&nbsp;&nbsp; #:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; TYPE NAME&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SIZE&nbsp; &nbsp; &nbsp;&nbsp; IDENTIFIER&nbsp;&nbsp; 0:&nbsp; &nbsp; &nbsp; GUID_partition_scheme&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; *1.0 TB&nbsp; &nbsp;&nbsp; disk1&nbsp;&nbsp; 1:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; EFI EFI&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 209.7 MB&nbsp;&nbsp; disk1s1&nbsp;&nbsp; 2:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Apple_HFS My Passport&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 999.8 GB&nbsp;&nbsp; disk1s2/dev/disk2 (external, physical):&nbsp;&nbsp; #:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; TYPE NAME&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SIZE&nbsp; &nbsp; &nbsp;&nbsp; IDENTIFIER&nbsp;&nbsp; 0:&nbsp; &nbsp; &nbsp; GUID_partition_scheme&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; *1.0 TB&nbsp; &nbsp;&nbsp; disk2&nbsp;&nbsp; 1:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; EFI EFI&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 209.7 MB&nbsp;&nbsp; disk2s1&nbsp;&nbsp; 2:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Apple_HFS Lacie 1TB&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 999.9 GB&nbsp;&nbsp; disk2s2&nbsp; &nbsp;&nbsp; In system report under 'Storage' I get essentially the same (ie, a single 1 TB internal drive). Under 'SATA' I see a reference to the Apple SSD Controller in which the drop down menu says:Unknown:&nbsp; Native Command Queuing:&nbsp; &nbsp; No&nbsp; Detachable Drive:&nbsp; &nbsp; No&nbsp; Bay Name:&nbsp; &nbsp; SSDI'm assuming at this point that the SSD drive may be fried, allowing me the rather slower option of using just the conventional 'Apple Fusion HDD' instead. The machine seems to work fine. I'm a bit confused, though as to why the SSD should have disappeared altogether. Surely the system should at least tell me if its not working? Also, I had the impression that the 1 TB Fusion drive in my machine included both the SSD and a conventional drive, so I would have thought that I would have less than 1TB available to me. If I try to reformat the drive and start from scratch am I likely to get my SSD drive back or is it gone for good?</blockquote>

[QUOTE="cgalloway, post: 1741263, member: 386496"] I have a late 2013 imac with a 1TB Fusion drive. A while ago I had problems in starting up. Basically, the machine would not boot unless I chose a non-SSD route on pressing the option key. Running disk utility told me: "first aid found corruption that needs to be repaired. to repair the startup volume, run first aid from recovery." I didnt pursue this because I was busy at the time. Coming back to it now, however, I cant find the SSD drive at all. I realise this is normal in disk utility, but I can find no sign of it anywhere else either. In terminal I get this: /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_HFS Apple Fusion HDD 999.9 GB disk0s2 /dev/disk1 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk1 1: EFI EFI 209.7 MB disk1s1 2: Apple_HFS My Passport 999.8 GB disk1s2 /dev/disk2 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk2 1: EFI EFI 209.7 MB disk2s1 2: Apple_HFS Lacie 1TB 999.9 GB disk2s2 In system report under 'Storage' I get essentially the same (ie, a single 1 TB internal drive). Under 'SATA' I see a reference to the Apple SSD Controller in which the drop down menu says: Unknown: Native Command Queuing: No Detachable Drive: No Bay Name: SSD I'm assuming at this point that the SSD drive may be fried, allowing me the rather slower option of using just the conventional 'Apple Fusion HDD' instead. The machine seems to work fine. I'm a bit confused, though as to why the SSD should have disappeared altogether. Surely the system should at least tell me if its not working? Also, I had the impression that the 1 TB Fusion drive in my machine included both the SSD and a conventional drive, so I would have thought that I would have less than 1TB available to me. If I try to reformat the drive and start from scratch am I likely to get my SSD drive back or is it gone for good? [/QUOTE]

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