i386/176410: 9.1 install CD/iso may delete bootblocks on other drives.

[root at ai1.alaska.net]

>Number:         176410
>Category:       i386
>Synopsis:       9.1 install CD/iso may delete bootblocks on other drives.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Feb 25 06:10:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Charlie
>Release:        FreeBSD 9.1-RELEASE i386
>Organization:
No Organization
>Environment:
CD/iso i386 installation of 9.1
System: FreeBSD 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243826: Tue Dec 4 06:55:39 UTC 2012 root at obrian.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386
        VIA Nehemiah 686 666MHz
>Description:
	Lost bootblocks on attached 32MB USB/SD card/drive, lost bootblocks on 60GB ATA primary master drive (while installing on slave).
>How-To-Repeat:
	Do not know exactly.  It is only known that no commitment was made to install on any drive other than the slave ATA 40GB drive, yet after installation, bootblocks were replaced on all other attached drives, rendering them unmountable with corrupted filesystems.
>Fix:
        Best determination is that the 9.1 install CD writes bootblocks to attached drives on a system, other than the drive it is actually committed to being installed upon.

>Release-Note:
>Audit-Trail:
>Unformatted: