Hello Mr.

è an old post, but decided that situation as follows:

When you attach the base within the D: \ <folder> \ MSSQL \ Data presented this error so I created another folder inside the Data folder put the base you want to attach inside the folder I created and it worked then the path was D: \ <folder > \ MSSQL \ Data \ <new <folder

Note: We attach multiple database within the directory D: \ <folder> \ MSSQL \ Data, and have never been read-only just this last.