SQL Server – How to Get Major and Minor Version

Don't know if you're still looking for a solution to this but I'd change the Powershell for the insert command just a little. Add this after the line setting $size = $_.Size

   $sql = "INSERT dbo.DiskSpace (drive, [free(bytes)], [total(bytes)]) VALUES ('$Name', $FreeSpace, $Size)"
   $sql | Out-File "C:\tmp\debug.sql" –Append # to wherever is appropriate for your system
   $cmd.CommandText = $sql

To me using the extra variable but getting an easier to read insert command is a good tradeoff and the debug.sql file makes finding sql errors much easier. HTH

sysfiles1 is an internal catalog table. There are many of them (basically any table with object_id between 1 and 99 is, by definition, an internal catalog table). The query compiler refuses to bind queries to them under normal context, so if you try to select from them you get the error you see. DAC connections can bind to them and retrieve data, but you still won't be able to update them.

This is all described on MSDN, see System Base Tables.

sysfiles1 though is a special case, not documented in the link above. This catalog table exists only in databases upgraded from SQL 2000. See http://blogs.msdn.com/b/sqlserverstorageengine/archive/2006/09/19/761437.aspx:

... sysfiles1 table is a linked-heap. This table contains the locations of the files comprising the database ...