I have added the following disk to a NetBSD machine:
  IBM  DCAS-32160, SCSI-3
  Formatted device capacity: 2.16GB
  Sector size: 512
  Data heads: 3
  Disks: 2

The output from dmesg is:
  sd0: 2063MB, 8188 cyl, 3 head, 172 sec, 512 bytes/sect x 4226725 sectors
                                                           ^^^^^^^ 

but 8188*3*172 is 4225008 and not 4226725.
                  ^^^^^^^
Where do the extra 1717 sectors come from?
                  
The output from fdisk is:
  loge# fdisk sd0    
  NetBSD disklabel disk geometry:
  cylinders: 8188 heads: 3 sectors/track: 172 (516 sectors/cylinder)

  BIOS disk geometry:
  cylinders: 524 heads: 128 sectors/track: 63 (8064 sectors/cylinder)

  Partition table:
  0: sysid 6 (Primary 'big' DOS, 16-bit FAT (> 32MB))
      start 63, size 4225473 (2063 MB), flag 0x0
	  beg: cylinder    0, head   1, sector  1
	  end: cylinder  523, head 127, sector 63
  1: <UNUSED>
  2: <UNUSED>
  3: <UNUSED>

It looks like 63+4225473=4225536 sectors are used, which is the
total number of sectors according to the BIOS geometry:
524*128*63 = 4225536
             ^^^^^^^

What is the correct number of total sectors?
Which values should I use to repartition the HD and make one big NetBSD
partition?

tia

-- 
Federico Lupi

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