問題
ずっとsda2のパーティションが残ってて消えない。。。
sudo fdisk -l /dev/sda
>>
Disk /dev/sda: 14.5 GiB, 15504900096 bytes, 30283008 sectors
Disk model: Silicon-Power16G
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x500a0dff
Device Boot Start End Sectors Size Id Type
/dev/sda1 1948285285 3650263507 1701978223 811.6G 6e unknown
/dev/sda2 0 0 0 0B 74 unknown
Partition table entries are not in disk order.
fdiskを使用して削除を試みても消すことができなかった。
sudo fdisk /dev/sda
>>
Welcome to fdisk (util-linux 2.33.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): d
Partition number (1,2, default 2): 2
Could not delete partition 2
解決
ddコマンドにより、HDDのデータを全てNULLで埋め尽くすことで解決できた。
sudo dd if=/dev/zero of=/dev/sda bs=1K count=1
- if=/dev/zero: 読み出し元を常にNULL文字を出力するデバイス/dev/zeroに設定
- of=/dev/sda: 書き込み先をHDDのデバイス/dev/sdaに設定
- bs=1K: 1Kbyte単位で書き込み
- count=1: 書き込み回数1
これを実行後に確認するとパーティションが全て消えていることがわかる。
sudo fdisk -l /dev/sda
>>
Disk /dev/sda: 14.5 GiB, 15504900096 bytes, 30283008 sectors
Disk model: Silicon-Power16G
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x435be661
後はfdiskで以下のように新たにパーティションを作成すればOK。
sudo fdisk /dev/sda
>>
Welcome to fdisk (util-linux 2.33.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-30283007, default 2048):
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-30283007, default 30283007):
Created a new partition 1 of type 'Linux' and of size 14.4 GiB.
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.
パーティション確認。
sudo fdisk -l /dev/sda
>>
Disk /dev/sda: 14.5 GiB, 15504900096 bytes, 30283008 sectors
Disk model: Silicon-Power16G
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x435be661
Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 30283007 30280960 14.4G 83 Linux
フォーマットもfdiskで以下のようにお好みで。
sudo fdisk /dev/sda
Welcome to fdisk (util-linux 2.33.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 84 OS/2 hidden or c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 85 Linux extended c7 Syrinx
5 Extended 41 PPC PReP Boot 86 NTFS volume set da Non-FS data
6 FAT16 42 SFS 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS/exFAT 4d QNX4.x 88 Linux plaintext de Dell Utility
8 AIX 4e QNX4.x 2nd part 8e Linux LVM df BootIt
9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M a0 IBM Thinkpad hi ea Rufus alignment
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD eb BeOS fs
f W95 Ext'd (LBA) 54 OnTrackDM6 a6 OpenBSD ee GPT
10 OPUS 55 EZ-Drive a7 NeXTSTEP ef EFI (FAT-12/16/
11 Hidden FAT12 56 Golden Bow a8 Darwin UFS f0 Linux/PA-RISC b
12 Compaq diagnost 5c Priam Edisk a9 NetBSD f1 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor ab Darwin boot f4 SpeedStor
16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+ f2 DOS secondary
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fb VMware VMFS
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fc VMware VMKCORE
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fd Linux raid auto
1c Hidden W95 FAT3 75 PC/IX bc Acronis FAT32 L fe LANstep
1e Hidden W95 FAT1 80 Old Minix be Solaris boot ff BBT
Hex code (type L to list all codes): 86
Changed type of partition 'Linux' to 'NTFS volume set'.
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.