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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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No hard drives listed in disk utility/install screen

After installing the SSD and replacing the broken HDD, I reassembled the iMac and was able to boot to internet recovery without a problem. Everything worked fine until I got to disk utility, where no hard drives were listed. They weren’t just unformatted, nothing was listed in the side bar. Also, in the install macOS screen no volumes were available to select for be installation. My guess is the power to the drives isn’t connected correctly, but I figured I’d hop on here and get a second opinion before I go taking the computer apart again. Any help would be greatly appreciated :-)

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I'm suspecting you installed SATA III (6.0 Gb/s) drives. Your systems SATA ports are only SATA II (3.0 Gb/s).

Please list out what you bought for drives and how you installed the SSD drive.

Did you follow this guide: Installing iMac Intel 27" EMC 2390 Dual Hard Drive Kit or did you do it this way? Installing iMac Intel 27" EMC 2309 and 2374 Dual Hard Drive

If you did the first method then your power splitter might not be good or not fully seated. If you followed the second guide then it's likely your drives.

iMac Intel 27" EMC 2309 and 2374 Dual Drive Image

Guide

Installing iMac Intel 27" EMC 2309 and 2374 Dual Drive

Difficulty:

Moderate

—

1 - 2 hours
iMac Intel 27" EMC 2390 Dual Drive Kit Image

Guide

Installing iMac Intel 27" EMC 2390 Dual HDD or SSD Drive

Difficulty:

Difficult

—

1 - 2 hours

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I followed the 2390 guide where you VHB tape the SSD behind the optical drive. SATA seems like the problem as this is the drive I installed: Samsung 850 EVO 500GB 2.5-Inch SATA III Internal SSD (MZ-75E500B/AM). This is the hdd: WD Blue 3TB Desktop Hard Disk Drive - 5400 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch - WD30EZRZ.

Looks like they’re both incompatible? Is there a standard recommendation for which drives to use? I don’t recall seeing that in the guide.

Thank you so much for that detailed answer :-)

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Well the Samsung should be good! It has port speed sense technology to match the systems speed (note the Interface line). Sadly, the HD does not it's a fixed speed drive only runs at SATA III.

So your SSD should have been visible.

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Rebecca Snyder will be eternally grateful.
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