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Some SSD manufacturers go in increments of 120, others 128.
Nowadays most premium and enterprise category go with 1000 formats rather than 1024 format. Because they provide what they promise or in other words you get what you see. People would find it offensive or cheating when you pay a premium price only to see a different spec than they offered.
To explain in detail, manufacturers compute storage in 1000 format while the computer itself reads in binary format which is in 1024.
So a 128GB SSD would be manufactured with storage of 128 x 1000 x1000 x 1000 bytes = 128,000,000,000 bytes. However the computer would read it as 128,000,000,000/ 1024/1024/1024 GB = ~120GB
So, when they say 128gb ssd you would actually see 120gb only. Better to say it as 120gb itself.