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Hooyah

macrumors member
Original poster
Aug 5, 2025
69
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We have a 256GB iMac M4 and the only real issue is that fixed SSD storage space. As much as we kick ourselves every week for not going for a higher end model... selling / trade in would be way too much of a loss. So we're stuck with it. One use in particular I haven't been able to enjoy is Parallels VMs as storing it locally for speed takes up way too much space for other family members, then they also can't have a VM or it infringes on another users space... you all know the problem!

Is there a particular method for connecting a fast SSD (up to the task or running applications, even a VM) to the iMac as the next best thing to having 1, 2 or even 4TB onboard? Since it's a desktop it can be a huge, bulky solution even requiring power.

Will macOS let me run apps from an external drive?
What's a good solution you guys recommend? I know plug in USB HDDs won't cut it, tried that myself and it's just painfully slow unfortunately.
 
I have a Samsung T7 USB3 SSD that works great.


If you want something faster, lots of people like the OWC Envoy Ultra that is Thunderbolt 5.
Thank you! I was thinking Thunderbolt 4 to get the maximum speed possible , but the pricing is eye watering!
 
If you do go for TB4 external SSD, be wary that some do not fall back to TB3, but instead fall back to USB3. I have this external TB3 SSD
for the same purpose as you.. to store numerous Parallels and UTM virtual machines. Is performant and works great for this use case. Bonus is TB compatibility across the Mac Intel/M-series spectrum.
 
One annoying reminder: factor in backup for whatever external drive(s) you use. You never want anything to exist on only one drive.

On my iMac M4, I keep a 2 TB SSD permanently attached for media (Photos, Music, TV libraries, plus a few other things), and then also have a big 4 TB HDD that backs up the iMac's internal and the external media drive. I have the whole mess tucked away inside the desk to I don't have to look at it :)
 
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What are you doing with the storage? If it's storing video or anything like that for playback, the slowest USB 3.2 (like the T7 which I own several of) will be fine. Ditto if it's small work related files. If you are doing 4k video editing or perhaps manipulating 500 61 MP raw photo files at a time, you might want to go TB4 for the speed. And I say this owning TB4 and TB5 drives (eye watering prices). Rarely do I do anything to actually notice the difference.
 
If you are willing to have a DIY solution, you can buy an internal NVME SSD and buy an enclosure and save some money compared to buying a dedicated external SSD. Be sure to check the speed of the enclosure, though, as that could be a bottleneck. Even if it says USB 10Gbps, it may only have a real speed of 1,000MB/s.

After all, that is what many SSDs really are, you are just DIYing the solution to save money.
 
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