linux下SD卡创建分区
一、对SD卡分区
1.将SD卡连接到PC机上，查看其设备名称
输入# dmesg|tail -20
......
[16392.819300] sd 16:0:0:0: [sdb] 31291392 512-byte logical blocks: (16.0 GB/14.9 GiB)
[16392.827038] sd 16:0:0:0: [sdb] Write Protect is off
[16392.827042] sd 16:0:0:0: [sdb] Mode Sense: 03 00 00 00
[16392.827044] sd 16:0:0:0: [sdb] Assuming drive cache: write through
[16392.848523] sd 16:0:0:0: [sdb] Assuming drive cache: write through
[16392.848530] sdb: sdb1 sdb2
[16392.863252] sd 16:0:0:0: [sdb] Assuming drive cache: write through
[16392.863265] sd 16:0:0:0: [sdb] Attached SCSI removable disk
2.使用fdisk工具进入sdb（设备名）
输入# sudo fdisk /dev/sdb
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help):进入到fdisk模式
3.查看分区
Command (m for help): p
Disk /dev/sdb: 16.0 GB, 16021192704 bytes
255 heads, 63 sectors/track, 1947 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x4b0e64c8
Device Boot Start End Blocks Id System
如果有分区可以用“Command (m for help): d”删除分区
4.开始分区
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p(选择p)
Partition number (1-4): 1（第一个分区）
First cylinder (1-1947, default 1):直接回车
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1947, default 1947): +50MB(第一分区大小)
第二个分区
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p(选择p)
Partition number (1-4): 2 （第二个分区）
First cylinder (8-1947, default 8):直接回车
Using default value 8
Last cylinder, +cylinders or +size{K,M,G} (8-1947, default 1947):直接回车（其他都为第二分区）
Using default value 1947
5.查看分区
Command (m for help): p
Disk /dev/sdb: 16.0 GB, 16021192704 bytes
255 heads, 63 sectors/track, 1947 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x4b0e64c8
Device Boot Start End Blocks Id System
/dev/sdb1 1 7 56196 83 Linux
/dev/sdb2 8 1947 15583050 83 Linux
6.修改分区类型，将第一分区改成“b W95 FAT32”格式
Command (m for help): t
Partition number (1-4): 1（修改第一分区）
Hex code (type L to list codes): L（查看类型列表）
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