!NetBSD の外付けハードディスク（HDD）の初期化の仕方
 # fdisk sd0
 fdisk: Cannot determine the number of heads
 Disk: /dev/rsd0d
 NetBSD disklabel disk geometry:
 cylinders: 991, heads: 64, sectors/track: 32 (2048 sectors/cylinder)
 total sectors: 2031120
 
 BIOS disk geometry:
 cylinders: 991, heads: 64, sectors/track: 32 (2048 sectors/cylinder)
 total sectors: 2031120
 
 Partition table:
 0: Primary 'big' DOS, 16-bit FAT (> 32MB) (sysid 6)
    start 63, size 2030049 (991 MB, Cyls 0/1/32-991/16/32), Active
 1: <UNUSED>
 2: <UNUSED>
 3: <UNUSED>

 # fdisk -u /dev/sd0
 fdisk: Cannot determine the number of heads
 Disk: /dev/sd0d
 NetBSD disklabel disk geometry:
 cylinders: 991, heads: 64, sectors/track: 32 (2048 sectors/cylinder)
 total sectors: 2031120
 
 BIOS disk geometry:
 cylinders: 991, heads: 64, sectors/track: 32 (2048 sectors/cylinder)
 total sectors: 2031120
 
 Do you want to change our idea of what BIOS thinks? [n] y
 
 Geometries of known disks:
 Disk 0: cylinders 1024, heads 27, sectors 63 (156301488 sectors, 76319MB)
 
 BIOS's idea of #cylinders: [0..1024 default: 991] 
 BIOS's idea of #heads: [0..256 default: 64] 
 BIOS's idea of #sectors: [1..63 default: 32] 
 Disk: /dev/sd0d
 NetBSD disklabel disk geometry:
 cylinders: 991, heads: 64, sectors/track: 32 (2048 sectors/cylinder)
 total sectors: 2031120
 
 BIOS disk geometry:
 cylinders: 991, heads: 64, sectors/track: 32 (2048 sectors/cylinder)
 total sectors: 2031120
 
 Are you happy with this choice? [n] y
 
 Partition table:
 0: Primary 'big' DOS, 16-bit FAT (> 32MB) (sysid 6)
     start 63, size 2030049 (991 MB, Cyls 0/1/32-991/16/32), Active
 1: <UNUSED>
 2: <UNUSED>
 3: <UNUSED>
 Which partition do you want to change?: [none] 0
 The data for partition 0 is:
 Primary 'big' DOS, 16-bit FAT (> 32MB) (sysid 6)
     start 63, size 2030049 (991 MB, Cyls 0/1/32-991/16/32), Active
 sysid: [0..255 default: 6] 169
 start: [0..992cyl default: 63, 0cyl, 0MB] 
 size: [0..992cyl default: 2030049, 991cyl, 991MB] 
 bootmenu: [] start1
 The bootselect code is not installed, do you want to install it now? [n] 
 
 Partition table:
 0: NetBSD (sysid 169)
     start 63, size 2030049 (991 MB, Cyls 0/1/32-991/16/32), Active
 1: <UNUSED>
 2: <UNUSED>
 3: <UNUSED>
 Which partition do you want to change?: [none] 
 
 Installed bootfile doesn't support required options.
 Update the bootcode from /usr/mdec/mbr? [n] 
 
 We haven't written the MBR back to disk yet.  This is your last chance.
 Partition table:
 0: NetBSD (sysid 169)
     start 63, size 2030049 (991 MB, Cyls 0/1/32-991/16/32), Active
 1: <UNUSED>
 2: <UNUSED>
 3: <UNUSED>
 Should we write new partition table? [n] y
 # 
 # 
 # 
 # 

 # sync
 # fdisk /dev/sd0
 Disk: /dev/sd0d
 NetBSD disklabel disk geometry:
 cylinders: 991, heads: 64, sectors/track: 32 (2048 sectors/cylinder)
 total sectors: 2031120
 
 BIOS disk geometry:
 cylinders: 992, heads: 64, sectors/track: 32 (2048 sectors/cylinder)
 total sectors: 2031120
 
 Partition table:
 0: NetBSD (sysid 169)
     start 63, size 2030049 (991 MB, Cyls 0/1/32-991/16/32), Active
 1: <UNUSED>
 2: <UNUSED>
 3: <UNUSED>
 #  

!パーティションの設定
 # disklabel -e /dev/sd0