@mcc storage brands these days virtually always label their (nonvolatile mass storage) products with powers of 10. they very commonly have a footnote that says "1 GB = 1000 MB = 1,000,000,000 bytes" or some such on the packaging

as for software, Windows uses "KB", "MB", etc. to label power-of-two sizes, technically incorrectly, because it's what people are used to, or something (pretty sure there's a Raymond Chen post to that effect). other systems vary... I think many Linux file browsers use binary prefixes ("MiB") correctly, but several CLI tools (notably, coreutils) use single letters ("M") for power-of-two sizes of bytes! it's usually clear in context though...