I have a MacBook Air Model Name: MacBook Air Model Identifier: MacBookAir7,2 Processor Name: Intel Core i5 Processor Speed: 1.8 GHz Number of Processors: 1 Total Number of Cores: 2 L2 Cache (per Core): 256 KB L3 Cache: 3 MB Memory: 8 GB Boot ROM Version: MBA71.0171.B00 SMC Version (system): 2.27f2 .Version 10.13.5 Went to have a look at my storage to see how much was taken by the MacBook System is 42.6GB then in about 10min it showed 50gb. Can any Please advise me on this system storage figure the internal ssd is a 256gb. Don't understand this. Hope I did it correct to get a screen shot and upload the file. Thanks David.