On Sun, Sep 23, 2001 3:22 AM, Georges Heinesch <mailto:geohei-ml@geohei.lu>
wrote:
>>>   3: <UNUSED>
>>>   ----- cut here -----
>
>*** Why is the last partition (3:) always <UNUSED>?

Because you alwase left it UNUSED.
eg . If you only wish to divide a pie in two-
why would you make two or more cuts instead of one?

Four partition table entries are allowed.
How many do you need?

Some math.
Part    start      size       end
0       16065  81931500  81947565
1	81947565   8122275  90069840
2
3			
Total for partitions 0 and 1 = 81931500 + 8122275 = 90053775
We see from dmesg that wd1 is 90069840 sectors in size.
90069840 - 90053775 + 16065 = 0

>
>*** Why does 0: start at 16065? To me, it looks like some unused
>partition would be ahead (possibly 2: or 3:)?

Because the start of partition 0 was offset by one cylinder
instead of one track.
Cylinder is 16065 sectors. Track is 63 sectors.
>Partition table:
>0: sysid 15 (Ext. partition - LBA)
>    start 16065, size 81931500 (40005 MB), flag 0x0
>    beg: cylinder    1, head   0, sector  1
>    end: cylinder 1022, head 254, sector 63

Should be:
>0: sysid 15 (Ext. partition - LBA)
>    start 63, size 81931500+16002 (40005 MB), flag 0x0
>    beg: cylinder    0, head   1, sector  1
>    end: cylinder 1022, head 254, sector 63


>
>> Post   dmesg |grep ^wd  along with your fdisk output.

>NetBSD is on wd1.

>wd0: drive supports 16-sector pio transfers, lba addressing
>wd0: 16479 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 33750864
sectors

>wd1: drive supports 16-sector pio transfers, lba addressing
>wd1: 43979 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 90069840
sectors

>wd0: no disk label

>0  1  80  1022  254  63  A9  1022  254  63  81,947,565  8,122,275
>Info: Begin C,H,S values were large drive placeholders.
>Info: End C,H,S values were large drive placeholders.
>Actual values are:
>0  1  80  5101    0   1  A9  5606  149  63  8,194,7565  8,122,275
>Error #109: Partition ends after end of disk.
>  ucEndCylinder (5606) must be less than 5606.
>Info: Partition didn't end on cylinder boundary.
>  ucEndHead expected to be 254, not 149.
>----- cut here -----
>
>1. The EndCyl is 1 Cyl too high.
>2. The haed is wrong (149 instead of 254).
>
>However I don't know if there values are now the BIOS reported values
>or the MBR values?!
>
>I'm sure there is a way to fix that without backup, recreating and
>restore.

What is happening here is that partition 1 does not end on a
cylinder boundry.
eg.

     start      size       end sectors/cylinder cylinders/Partition	
0    16065  81931500  81947565   16065               5100
1 81947565   8122275  90069840   16065               ~505.588

5100 + 505.58823529411765 = 5605.5882352941176 cylinders.

That half cylinder at the end of the NetBSD partition
is what the partitioning software is wining about.

Time to backup the data on the drive and start over.

 New Partition Table.
 New disk label for NetBSD.





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