This file is indexed.

/usr/lib/dpkg/methods/disk/names is in dselect 1.18.25.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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30 cdrom Install from a CD-ROM.
35 nfs Install from an NFS server (not yet mounted).
40 harddisk Install from a hard disk partition (not yet mounted).
42 mounted Install from a filesystem which is already mounted.