Thanks for the link. It looks interesting, if expensive, so I checked out Amazon UK for prices here. Reviews of the OWC 1Tb SSD were not favourable – mostly complaining about heat, over-active fans and cases being warped. Oops. Suddenly, 256Mb seems like plenty of space!
iMac (19,1, 3.1 GHz i5, 12.7.4, 40 Gb RAM); MacBook Air (1.8 Ghz, 8 Gb RAM, 10.14.6, 256 Gb SSD) Vodafone router and Devolo Wi-Fi Extender, Canon TS8351 printer/scanner.
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