Preventing a Defective drive from Mounting

[Hexley]

hi!

I have a late 2012 iMac with Fusion Drive. A year agothe HDD became defective and I was forced to split the Fusion drive between the HDD and SSD. Doing this allowed me to do a fresh install of macOS onto the SSD.

The problem now is every other boot up macOS detects the defective HDD and tries to mount it. This results in a slower boot time and login.

macOS would eventually give up and report that I should manually "eject" the defective drive before "unplugging it".

Now, is there a command where in macOS will not mount the defective HDD at boot?

I was toying around with installing a 10TB or 12TB HDD to replace the defective 1TB and make a new Fusion Drive but I fear breaking anything more.

I have the install kit from OWC to replace a drive but I am a bit hesitant.

 

[nambuccaheadsau]

Do both the PCI-e and platter drive appear in System Preferences > Startup Disc? If so make sure the PCI-e drive is highlighted as the boot drive.

 

[EugW]

If the HD is erasable, then erase it. Then...

Do both the PCI-e and platter drive appear in System Preferences > Startup Disc? If so make sure the PCI-e drive is highlighted as the boot drive.

Even if the SSD is the only option for Startup Disk, make sure it is highlighted.

 

[Hexley]

Do both the PCI-e and platter drive appear in System Preferences > Startup Disc? If so make sure the PCI-e drive is highlighted as the boot drive.

macOS only sees the SSD. Platter drive isn't seen.
[doublepost=1506735639][/doublepost]

If the HD is erasable, then erase it. Then...


Even if the SSD is the only option for Startup Disk, make sure it is highlighted.

Done and done