here is the exact error message

Server: Msg 3241, Level 16, State 37, Line 1

The media family on device 'e:\sqlserver\mssql\backup\attain_tlog_200306030900.TRN'

is incorrectly formed. SQL Server cannot process this media family.

Server: Msg 3013, Level 16, State 1, Line 1

RESTORE LOG is terminating abnormally.

quote:

---

Please ensure restoration of transaction logs is in correct sequence.

---