Which Crucial SSD compatibility with my Mac

Cross-posting to Macrumors forum, are we?

iMac 2015 has USB 3.0 ports.

MacBook Air 2014 has USB 3.0 ports.

Those ports support half the advertised speed of the X9, and a quarter of the speed of the X10, so that either disk will be limited by the USB ports of these Macs.

Crucial mentions Mac compatibility. If you use their software for extra features (maybe you don’t need that*), then there may be addition requirements for system software version.

Your older Macs will want the HFS+ (Mac OS Extended) file system on disks for best performance. The disk will not have that initially. Re-format using Disk Utility. HFS+ is normally not compatible with Windows, if you ever need that, so choose wisely.

Their included USB cable is USB-C, which may not match your computer, so use a different cable or use a USB-C to USB-A adapter.

*There are valid reasons for choosing not to use third party disk software. I would recommend: Re-format with Disk Utility, and never depend on third party software developers to stay up-to-date. Their extras are not that good.

If you're interested in an external SSD from Crucial then contact their Customer Support personnel to get their recommendation on which of their external SSD is best for your Mac model, workflow requirements and budget.

I would also do the same with OWC (MacSales.com) as they have excellent offerings in external SSDs for Macs.