Another question - 5.8 install CD won't boot?

Hi all,

I think I may know the answer to this already but I have my 5.8 disc set
that I pre-ordered and figured I could just throw disk 1 in the drive of
this Alphastation 500/400 and boot it up over the serial console.

Unfortunately I got an error from the SRM:

block 0 of dka4 is not a valid boot block
bootstrap failure

The CDROM spun up and everything so I'm sure I'm hitting the right bus and
SCSI ID, however it doesn't like the disc.

In looking at the box they came in, it doesn't specifically say that the
Alpha disc (which shares media with i386 and HPPA) is bootable.  I'm
guessing I'll need to burn my own from the install58.iso file on the FTP
site?

Thanks,
Bryan