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<blockquote data-quote="chscag" data-source="post: 1741265" data-attributes="member: 46727">Welcome to our forums.Fusion drives are great when working right. However, they can be problematic when errors on them occur or they completely fail.&nbsp; It sounds like the SSD portion of the Fusion drive has failed and now no longer shows up in Disk Utility.&nbsp; Formatting is not going to help and may make things worse.&nbsp; Is your iMac covered by Apple Care? If not, are you close to an Apple Store?&nbsp; I know it's not fun lugging an iMac to have it serviced, but that may be your best source of getting it repaired. The 2013 iMac is a very difficult machine to work on by one's self and is not recommended unless you are an experienced tech.Even if your iMac is no longer covered by Apple care, the genius bar will run diagnostics for free.&nbsp; They will of course charge for repairs and parts. Also, I strongly recommend you make a backup of your data as soon as you can.</blockquote>

[QUOTE="chscag, post: 1741265, member: 46727"] Welcome to our forums. Fusion drives are great when working right. However, they can be problematic when errors on them occur or they completely fail. It sounds like the SSD portion of the Fusion drive has failed and now no longer shows up in Disk Utility. Formatting is not going to help and may make things worse. Is your iMac covered by Apple Care? If not, are you close to an Apple Store? I know it's not fun lugging an iMac to have it serviced, but that may be your best source of getting it repaired. The 2013 iMac is a very difficult machine to work on by one's self and is not recommended unless you are an experienced tech. Even if your iMac is no longer covered by Apple care, the genius bar will run diagnostics for free. They will of course charge for repairs and parts. Also, I strongly recommend you make a backup of your data as soon as you can. [/QUOTE]

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