Search notes:

sys.sysdbfiles

sys.sysdbfiles is a system base table, thus it needs a dedicated administrator connection to select from it.
On my SQL Server installation, the table lists two inexisting paths: 
select * from master.sys.sysdbfiles

dbfragid    fileid      fileguid                             pname
----------- ----------- ------------------------------------ ---------------------------------------------------
1           1           00000000-0000-0000-0000-000000000000 d:\YukSp2CU\sql\ntdbms\scripts\usa\x86\master.mdf
1           2           00000000-0000-0000-0000-000000000000 d:\YukSp2CU\sql\ntdbms\scripts\usa\x86\mastlog.ldf

See also

sys.sysfiles1

Index

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/developm...', 1758210296, '216.73.216.150', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/SQL-Server/administration/schemas/sys/objects/system-base-tables/sysdbfiles(45): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78