![]() The enclosure does get warm, but not hot, and I have it resting in the Vesa monitor mount in the back of the iMac. I also looked at SanDisk’s Extreme Pro drives, but the price was higher and performance was lower. I went with the WD Black SN750 1TB drive in a TEKQ Thunderbolt 3 enclosure. Since this would probably be my startup drive on my main computer for the foreseeable future (easy to migrate to a new mac by just plugging in an external), I decided to go for the higher performance of a NVMe drive as well. I had used a waterproof external ( Silicon Power Armor A80)* for work in the past for my startup drive so I wouldn’t have to bike with a laptop, so this setup was familiar/comfortable for me. I decided to upgrade to an external SSD as my main drive, and use the internal Fusion drive as an cloned bootable backup. I was thinking about how I wanted to back up that 2TB drive when I had a different idea. Was easy enough to re-join them since I didn’t have any data on the machine.īeing a fairly high-end machine it was still very usable but not as responsive as my old MBA with an SSD I was replacing. Was my first time with a fusion drive, so didn’t even know they could be split into separate devices. I had purchased a used 27" 2017 iMac (3.8 GHz quad-i5, 40GB, Radeon 580) that came with a 2TB fusion that the previous owner has split. Reading this article was like deja vu, I went through almost the same process last fall. Some people disagree strongly with claims like this, but that’s beyond the scope of this discussion. For example OWC says this for the drives they sell. But even if your enclosure has support, your computer’s OS still needs to send the command.īut it should also be noted that some SSD manufacturers claim TRIM is unnecessary. In theory, it is possible to run TRIM over USB if the enclosure supports UAS, since SCSI’s “UNMAP” command performs the same function. If the trimforce command is something you’re not comfortable using, there is a commercial product, Trim Enabler which does the same thing, but with a really friendly GUI (and several bundled diagnostic tools). (Don’t forget to reboot after running this command - the change won’t take effect until you do.) Whether this will work on USB devices or if it is reserved for other interfaces (e.g. You can, however, run the trimforce command to let it work on third-party SSDs. Out of the box, macOS will not even attempt TRIM on non-Apple hardware. Not aware of a driver download for TRIM that works for USB though. DriveDx - External USB / FireWire drive diagnostics support. I don’t think they’ve changed any code (their fork of the GitHub page is in sync with the master repository), but they have compiled it with the latest tools and have signed it with their developer ID, so I would expect their builds to work without too much hassle. On the plus side, it appears that BinaryFruit (makers of DriveDX) distributes and supports it (at least for use with DriveDX). At minimum, I suspect you’ll need to recompile it yourself since I don’t think the installer images are signed, which Apple absolutely requires for kernel drivers. Unfortunately, the most popular such driver, Kasbert’s OS-X-SAT-SMART driver hasn’t been updated for many years, so I don’t know how compatible it might be with current releases of macOS. There are kernel drivers you can install which will make this information available. As your SSD fills up over time, this process become slower because less empty blocks are available, necessitating overwriting of data.The most obvious things not supported on external USB devices are TRIM and SMART. SSDs on the other hand must find an empty block to write the data to. Because of this, hard drives can write information anywhere, but the plate needs to spin to the correct location first, slowing it down. SSDs store information in “blocks,” whereas hard drives store data to a magnetic plate. SSDs use flash memory, similar to RAM, only that SSD retains the data after it is powered down. Without getting too technical, SSDs write and delete data differently to mechanical hard drives. Nowadays Apple has included an official way to enable TRIM on third party SSDs, and all that is a required is a quick terminal command. That means if you choose to upgrade your Mac with a third party solid state drive, TRIM will not be enabled, reducing the drive’s performance.īefore OS X 10.10.4, enabling TRIM required the user to disable security features from within the Mac OS. Windows 7 and beyond has enabled TRIM for all SSDs however, in Macs TRIM is only enabled on SSDs supplied by Apple. Job is done, right? If you’re using a Mac, you have one more step, enabling TRIM. You’ve installed it into your computer, and everything boots up fine. So you’ve purchased an SSD, and you’ve cloned your existing hard drive.
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