best ssd replacement

[denniscampbell]

21.5 late 2015 imac: replacing hd and fan .....have fan already an am looking for a good internal ssd, 500 - 1tb, have used sony for external ssd but would like something more dependable ...keeping the mac / Mojave for
the complete cs6 photo shop with all the filters and a new mother board that has less than 2 years use

 

[Randy B. Singer]

It isn't choosing a brand that is the hard part.

Purchasing in internal SSD for a particular model of Macintosh is a quagmire, because Apple has changed their (often proprietary) interface a number of times. Have a look at:

Apple Proprietary SSDs: Ultimate Guide to Specs & Upgrades
https://beetstech.com/blog/apple-proprietary-ssd-ultimate-guide-to-specs-and-upgrades

and it's vitally important to ascertain if the SSD in question supports TRIM (particularly, Apple's implementation of TRIM in the OS):

https://en.wikipedia.org/wiki/Trim_(computing)

http://www.thessdreview.com/daily-n...ion-and-trim-in-ssds-explained-an-ssd-primer/

Some third party hard drives have claimed to handle TRIM without software support from the host OS, but what is offered isn't always as good as a full implementation of TRIM. And there have been third party kludges to make Mac OS's TRIM work with third party hard drives, but the results haven't always been ideal.