[robespierre]

The error message coming from mount(1M) is "Invalid argument", with no indication of which argument was invalid, or why. This is typical New Jersey software engineering. The arguments to mount(1M) come from /etc/fstab, which evidently has an entry for dks1d4s7 and /CDROM.

Code:

% grep CDROM /etc/fstab

It probably looks something like

Code:

/dev/dsk/dks1d4s7 /CDROM efs ro 0 0

but this won't work if the named device file or mount point don't already exist (mount(1M) never creates inodes)

Code:

Inst> shell
% ls -d /dev/dsk/dks1d4s7
% ls -d /CDROM

If either command returns "no such file or directory", you know that this filesystem has been tampered with.