Re: Corrupted partition table

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>]

:>     Generally when installing DragonFly on a partition that is not
:>     at the beginning of the disk, packet mode is required.  Packet mode
:
:This is not directly related to what happened. The point is that I 
:installed DFly on /dev/ad0s2 while Windows was at /dev/ad0s1. The 
:first time I reviewed the partition table (after a reboot), I found 
:the following:
:
:...
:cylinders=116280 heads=16 sectors/track=63 (1008 blks/cyl)
:
:Media sector size is 512
:Warning: BIOS sector numbering starts with sector 1
:Information from DOS bootblock is:
:The data for partition 1 is:
:<UNUSED>
:The data for partition 2 is:
:<UNUSED>
:The data for partition 3 is:
:<UNUSED>
:The data for partition 4 is:
:sysid 165,(DragonFly/FreeBSD/NetBSD/386BSD)
:     start 63, size 117210177 (57231 Meg), flag 80 (active)
:         beg: cyl 0/ head 1/ sector 1;
:         end: cyl 567/ head 15/ sector 63
:Partition 4 is marked active
:...

    Well, something reinitialized the dos slice table, but I have no idea
    what would have done that.  While the installer does rewrite the
    sector containing the slice table, it does not actually change the
    contents of the table unless you tell it to 'use the whole disk',
    and in that case I think it uses slice 1 rather then 4.  It might
    have been something you played with while you were trying to add the
    DragonFly slice in the first place, that is all I can think of.

					-Matt
					Matthew Dillon 
					<dillon@xxxxxxxxxxxxx>