Before mibi-, gibi-, tibibytes, etc. were a thing, it was the harddrive manufacturers who were creating a little. Everyone saw a kilobyte as 1024 bytes but the storage manufacturers used the SI definition of kilo=1000 to their advantage.

By now, however, kibibytes being 1024 bytes and kilobytes being 1000 bytes is pretty much standard, that most agree on. One notable exception is of course Windows…