sd卡重新分割槽以及格式化
阿新 • • 發佈:2021-02-03
掛載
檢視SD卡掛掛載點:
df -T
# (-h可以檢視單位為M的大小)
解除安裝SD卡:
sudo umount /dev/sdb1 /dev/sdb2
使用fdisk工具刪除分割槽、新增分割槽:
sudo fdisk /dev/sdb
輸入m 幫助:
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
輸入p檢視當前sd卡的分割槽(partition)資訊:
Command (m for help): p Disk /dev/sdb: 7948 MB, 7948206080 bytes 245 heads, 62 sectors/track, 1021 cylinders, total 15523840 sectors Units =
sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sdb1 * 2048 1048576 523264+ c W95 FAT32 (LBA) /dev/sdb2 1048577 15523839 7237631+ 83 Linux
刪除分割槽
輸入d刪除(delete)所有sd卡分割槽。因為有2個分割槽,需要刪除2次
Command (m for help): d
Partition number (1-4): 1
Command (m for help): d
Selected partition 2
建立分割槽
輸入n新建(new)一個分割槽
輸入p選擇新建一個主分割槽
輸入1建立分割槽1
輸入分割槽1的‘First sector’和‘Last sector’
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-15523839, default 2048): 2048
Last sector, +sectors or +size{K,M,G} (2048-15523839, default 15523839):
Using default value 15523839
輸入w將建立完成對分割槽表寫入sd卡,並退出
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: If you have created or modified any DOS 6.x
partitions, please see the fdisk manual page for additional
information.
Syncing disks.
格式化分割槽
格式化 fat 分割槽(windows下可見):
sudo mkfs.vfat -F 32 -n boot /dev/sdb1
格式化 ext3 分割槽:
sudo mkfs.ext3 -L rootfs /dev/sdb2
fat分割槽存放核心、裝置樹等。ext3分割槽存放根檔案系統。