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I'm looking to upgrade my iMac 14.2 (late 2013) by swapping out the existing HDD with a Seagate SSHD Hybrid drive, along with adding another 8Gb memory. I've done a similar upgrade on my daughter's iMac (same model) but used a SSD and it works great with major enhancement in speed.
I would like to use a SSHD to save some money. Is there anything I need to do differently when installing a CLEAN version of High Sierra (I have already downloaded to a USB drive from the Apple APP store) onto the SSHD Hybrid? Yes, you can use a Seagate SSHD on your 2013 iMac. Installing a new version of High sierra I would recommend formatting the disk to APFS, which is Apple's new optimised SSD & 'fusion' file format. Everything else will work fine.
Apr 08, 2017 Problem: Just upgraded to os sierra and my external seagate to won't show on my mac. All of my stuff is on there. But after i plug it into a windows comp, it appear and is working fine, so still don't know what the issue is. In the meantime, don’t update to this beta 2 of 10.13.4 if you have a non-TB3 Mac. With the release of High Sierra 10.13.4 beta today, we noticed significant improvements for external graphics use. The first visual change is the addition of a top menu icon, dedicated to ejecting an attached eGPU prior to physically disconnecting it.
The way the SSHD works is the SSD portion is just cached, and the drive itself manages what goes into the cache rather than the OS. Seagate SSHD had some issues with the newer drive models in older macs, but that is mainly due to being a 3Gb/s SATA connector. As your late 2013 machine has 6Gb/s SATA, any seagate drive (Firecuda (new model) or momemntus (old model)) will be compatable. You can read a little bit more into it on the website, if you're interested in in-depth info.