Not the most elegant solution but it works very well and wasn’t too expensive. I already had one but the HP docks are on eBay for cheap (get the travel version without attached TB3 cable - I’ve seen them as low as $50 with power adapter) and I got the TB adapter and cable off FB marketplace for a combined $25. It’s much faster than a USB3 drive and a ton faster than the internal spinner. Booting works and no sleep issues either. I get read and write speeds of right around 1250 MB/sec. It’s a base model 27” late 2015 iMac with standard hard drive. I connected it to a HP portable Thunderbolt 3 dock which is connected to an Apple TB3 to TB2 Adapter which is plugged into the iMac with an Apple TB2 cable. Here is what I just did: 512 GB NVMe-based external Thunderbolt 3 SSD (was just $100 at Amazon). Put the old TM drive is your desk at work, or see place far away. This will prevent human error which is easier than you r think to do. To avoid accidents, unplug the tm drive and lock it in a drawer until after the transition is complete.
You have your old data i-on the old drive and I presume a Time Machine backup of this. One issue is keeping a usable backup while you make the switch. Maybe even wait until our cloud backup is done? (If you don't have this, sign up for it. I would not erase (aka "reformat') the internal drive until after you are running a few data on the external SSD and Time Machine has finished it's first complete backup of the new SSD. Make sure this TM drive is at least 2X larger then al to data you have or will have YouTime machine backup drive does not need to be USB 3, it can be slow but you may as well use USB 3. Also if you have no already done so install as much RAM as will fit the the iMac, just max it out. The above is exactly what I did with my iMac. and ADTER the first full Time Machine backup, then, erase the Mac Internal drive, make it also APFS and use it for storing bulk data that dose not need to be on the SSD. Then change the default boot drive and reboot.Īfter using your new system long enough that you are sure there are now problems. Format it as APFS, install MacOS then use Apple's migration assistant to move you data and apps.
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