You are confusing the electronic level and the filing system levels. There are only two electronic operations, read bits and write bits, they apply whatever operations you want to achieve. When considering files you have think in terms of structures of data and how to manipulate them. There are still R/W operations but you have to set read addresses to access the structures, for example the file directory, and based on what you read, then perform write operations to free the file addresses. There is no byte level operation to delete any file.
Brian.