fdiskじゃなくてcfdiskなるコマンドがあることを知った。
cfdisk 2.12p
Disk Drive: /dev/sda
Size: 2000398934016 bytes, 2000.3 GB
Heads: 255 Sectors per Track: 63 Cylinders: 243201
Name Flags Part Type FS Type [Label] Size (MB)
------------------------------------------------------------------------------
Unusable 8.23
sda1 Primary Linux ext3 213.86
sda2 Primary Linux ext3 419.49
sda3 Primary Linux swap / Solaris 542.87
sda5 Logical Linux ext3 213.86
sda6 Logical Linux ext3 1998998.03
[Bootable] [ Delete ] [ Help ] [Maximize] [ Print ]
[ Quit ] [ Type ] [ Units ] [ Write ]
Toggle bootable flag of the current partition…ぜったいこのほうがやりやすいじゃないか！
