Suppose in my SQL2005 database accounting is used in LAN, their copy two files: data1.mdf and data1_log.LDF another folder and renamed data2_log.LDF data2.mdf and, then, di transfer these 2 files into the same directory that contains the original accounting database when attach data2.mdf file into SQL2005 error: Can not attach a database with the same name as an existing database there. While I have renamed then why not attach files? want to attach the data file do?