TK432.ndf is the file. Each filegroup may contain one or more files.

To illustrate this, see the tabs for files and filegroups in SS Management Studio.

It's explained in...

Any tables not assigned a partition scheme or explicit filegroup will default to the primary filegroup. If multiple files are contained within a filegroup, data will be distributed between...

Using a Certificate Versus Stored Procedure WITH EXECUTE AS

Hello Jonathan, I appreciated this article. It got me wondering, what signing with a certificate gets us that SP WITH EXECUTE...