[root@NicaNB ~]# fdisk /dev/sdb <= 用 fdisk 處理 /dev/sdb 裝置
Command (m for help): p  <=  印出這個裝置的磁碟分割表
Disk /dev/sdb: 1023 MB, 1023410176 bytes
32 heads, 61 sectors/track, 1024 cylinders
Units = cylinders of 1952 * 512 = 999424 bytes
Disk identifier: 0×6f20736b

This doesn’t look like a partition table
Probably you selected the wrong device.

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   ?      398636      983425   570754815+  72  Unknown
Partition 1 has different physical/logical beginnings (non-Linux?):
phys=(357, 116, 40) logical=(398635, 6, 23)
Partition 1 has different physical/logical endings:
phys=(357, 32, 45) logical=(983424, 30, 61)
Partition 1 does not end on cylinder boundary.
…(略)
/dev/sdb4   ?           1     1863334  1818613248    d  Unknown
Partition 4 has different physical/logical beginnings (non-Linux?):
phys=(372, 97, 50) logical=(0, 0, 1)
Partition 4 has different physical/logical endings:
phys=(0, 10, 0) logical=(1863333, 7, 53)
Partition 4 does not end on cylinder boundary.

Partition table entries are not in disk order
<= 其實這顆 USB 沒有作磁碟分割，早期才有在作，後來的都是直接插入就能用了。

Command (m for help): o <= 建立新的空 DOS 分割表

Building a new DOS disklabel with disk identifier 0xb130cfa9.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won’t be recoverable.

Warning: invalid flag 0×0000 of partition table 4 will be corrected by w(rite)

Command (m for help): w <= 將方才的動作寫入磁碟，並結束離開
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 0: 成功.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.

再度進入 fdisk
[root@NicaNB ~]# fdisk /dev/sdb
Command (m for help): p <= 檢視 partition

Disk /dev/sdb: 1023 MB, 1023410176 bytes
32 heads, 61 sectors/track, 1024 cylinders
Units = cylinders of 1952 * 512 = 999424 bytes
Disk identifier: 0xb130cfa9

Device Boot      Start         End      Blocks   Id  System <= 分割表裡什麼也沒有
Command (m for help): n <= 建立新的分割 ( partition)
Command action
e   extended
p   primary partition (1-4)
p <=  選擇建立 primary partition
Partition number (1-4): 1 <= 主 partition 1 號
First cylinder (1-1024, default 1): 1 <= 從磁柱 1 開始
Last cylinder, +cylinders or +size{K,M,G} (1-1024, default 1024): 256 <= 到磁柱 256

Command (m for help): n <= 準備建立第二個 primary partition
Command action
e   extended
p   primary partition (1-4)
p <= 建立 primary partition
Partition number (1-4): 2 <= primary 2 號
First cylinder (257-1024, default 257): 257 <= 從磁柱 257 (cylinder) 開始
Last cylinder, +cylinders or +size{K,M,G} (257-1024, default 1024): +128M <= 增加 128M 的空間

Command (m for help): p <= 查看磁碟分割表狀態

Disk /dev/sdb: 1023 MB, 1023410176 bytes
32 heads, 61 sectors/track, 1024 cylinders
Units = cylinders of 1952 * 512 = 999424 bytes
Disk identifier: 0xb130cfa9

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1         256      249825+  83  Linux
/dev/sdb2             257         391      131760   83  Linux

Command (m for help): l <= 列出可供設定的檔案系統編號

0  Empty           1e  Hidden W95 FAT1 80  Old Minix       bf  Solaris
1  FAT12           24  NEC DOS         81  Minix / old Lin c1  DRDOS/sec (FAT-
2  XENIX root      39  Plan 9          82  Linux swap / So c4  DRDOS/sec (FAT-
3  XENIX usr       3c  PartitionMagic  83  Linux           c6  DRDOS/sec (FAT-
4  FAT16 <32M      40  Venix 80286     84  OS/2 hidden C:  c7  Syrinx
5  Extended        41  PPC PReP Boot   85  Linux extended  da  Non-FS data
6  FAT16           42  SFS             86  NTFS volume set db  CP/M / CTOS / .
7  HPFS/NTFS       4d  QNX4.x          87  NTFS volume set de  Dell Utility
8  AIX             4e  QNX4.x 2nd part 88  Linux plaintext df  BootIt
9  AIX bootable    4f  QNX4.x 3rd part 8e  Linux LVM       e1  DOS access
a  OS/2 Boot Manag 50  OnTrack DM      93  Amoeba          e3  DOS R/O
b  W95 FAT32       51  OnTrack DM6 Aux 94  Amoeba BBT      e4  SpeedStor
c  W95 FAT32 (LBA) 52  CP/M            9f  BSD/OS          eb  BeOS fs
e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a0  IBM Thinkpad hi ee  GPT
f  W95 Ext’d (LBA) 54  OnTrackDM6      a5  FreeBSD         ef  EFI (FAT-12/16/
10  OPUS            55  EZ-Drive        a6  OpenBSD         f0  Linux/PA-RISC b
11  Hidden FAT12    56  Golden Bow      a7  NeXTSTEP        f1  SpeedStor
12  Compaq diagnost 5c  Priam Edisk     a8  Darwin UFS      f4  SpeedStor
14  Hidden FAT16 <3 61  SpeedStor       a9  NetBSD          f2  DOS secondary
16  Hidden FAT16    63  GNU HURD or Sys ab  Darwin boot     fb  VMware VMFS
17  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE
18  AST SmartSleep  65  Novell Netware  b8  BSDI swap       fd  Linux raid auto
1b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid fe  LANstep
1c  Hidden W95 FAT3 75  PC/IX           be  Solaris boot    ff  BBT

Command (m for help): t <= 變更檔案系統
Partition number (1-4): 1 <= 選擇要變更的是 1 號分割區的檔案系統
Hex code (type L to list codes): c <= 選擇變更為 c ，以上表所示，c 為 『W95 FAT32 (LBA)』

Command (m for help): p

Disk /dev/sdb: 1023 MB, 1023410176 bytes
32 heads, 61 sectors/track, 1024 cylinders
Units = cylinders of 1952 * 512 = 999424 bytes
Disk identifier: 0xb130cfa9

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1         256      249825+   c  W95 FAT32 (LBA) <= 成功變更
/dev/sdb2             257         391      131760   83  Linux

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