執行7 Advanced Options -> A1 Expand Filesystem 擴充Micro SD卡可使用的容量，一般狀況，如果在第一次開機時會自動延伸可用的sd空間，所以在第一次開機時都會比較久一點，如果第一次開機未完成，就有可能出現「Expand Filesystem」未執行成功，所以就會出現如下的內容，目前所使用32g的sd卡，但讀出來的結果卻怪怪的，那這個時後就要手動執行此功能讓系統空間能正常
第一次開機時未完成就強制關機
執行後的結果
執行Expand Filesystem後，會出現如下圖的畫面，告知，Root partition has been resized，在下次重開機後檔案系統就會放大…
執行完如果沒有馬上重新開機，可以把畫面行上移就可以看到如下的執行過程
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pi@raspberrypi:~ $ df -m
Filesystem 1M-blocks Used Available Use% Mounted on
/dev/root 20421 19782 0 100% /
devtmpfs 460 0 460 0% /dev
tmpfs 464 0 464 0% /dev/shm
tmpfs 464 18 446 4% /run
tmpfs 5 1 5 1% /run/lock
tmpfs 464 0 464 0% /sys/fs/cgroup
/dev/mmcblk0p1 41 21 21 51% /boot
tmpfs 93 0 93 0% /run/user/1000pi@raspberrypi:~ $ df -m
Filesystem 1M-blocks Used Available Use% Mounted on
/dev/root 29137 1098 26824 4% /
devtmpfs 460 0 460 0% /dev
tmpfs 464 0 464 0% /dev/shm
tmpfs 464 12 452 3% /run
tmpfs 5 1 5 1% /run/lock
tmpfs 464 0 464 0% /sys/fs/cgroup
/dev/mmcblk0p1 41 21 21 51% /boot
tmpfs 93 0 93 0% /run/user/1000Welcome to fdisk (util-linux 2.29.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): Disk /dev/mmcblk0: 29 GiB, 31104958464 bytes, 60751872 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
Disklabel type: dos
Disk identifier: 0xaf9d139f
Device Boot Start End Sectors Size Id Type
/dev/mmcblk0p1 8192 93236 85045 41.5M c W95 FAT32 (LBA)
/dev/mmcblk0p2 94208 60751871 60657664 28.9G 83 Linux
Command (m for help): Partition number (1,2, default 2):
Partition 2 has been deleted.
Command (m for help): Partition type
p primary (1 primary, 0 extended, 3 free)
e extended (container for logical partitions)
Select (default p): Partition number (2-4, default 2): First sector (2048-60751871, default 2048): Last sector, +sectors or +size{K,M,G,T,P} (94208-60751871, default 60751871):
Created a new partition 2 of type 'Linux' and of size 28.9 GiB.
Partition #2 contains a ext4 signature.
Command (m for help):
Disk /dev/mmcblk0: 29 GiB, 31104958464 bytes, 60751872 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
Disklabel type: dos
Disk identifier: 0xaf9d139f
Device Boot Start End Sectors Size Id Type
/dev/mmcblk0p1 8192 93236 85045 41.5M c W95 FAT32 (LBA)
/dev/mmcblk0p2 94208 60751871 60657664 28.9G 83 Linux
Command (m for help): The partition table has been altered.
Calling ioctl() to re-read partition table.
Re-reading the partition table failed.: Device or resource busy
The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8).