before restoring backup check following...
restore verifyonly from disk ='E:\bk_full_datacenter\test1.bak' --The backup set on file 1 is valid.
restore labelonly from disk ='E:\bk_full_datacenter\test1.bak'-- media related information
restore filelistonly from disk ='E:\bk_full_datacenter\test1.bak'--list filegroups in backup
restore headeronly from disk ='E:\bk_full_datacenter\test1.bak' --see compatiblity level and software version
then try to restore backup..