已經掛載好的分割槽可以通過df -h來檢視，連線的裝置可以通過fdisk -l來檢視。比如：
root@openwrt:~# fdisk -l
disk /dev/mtdblock0: 192 kib, 196608 bytes, 384 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 /dev/mtdblock1: 64 kib, 65536 bytes, 128 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 /dev/mtdblock2: 64 kib, 65536 bytes, 128 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 /dev/mtdblock3: 15.7 mib, 16449536 bytes, 32128 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 /dev/mtdblock4: 14.7 mib, 15419904 bytes, 30117 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 /dev/mtdblock5: 4.6 mib, 4784128 bytes, 9344 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 /dev/sda: 15.5 gib, 16634675200 bytes, 32489600 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: 0x017e1ea1
device boot start end blocks id system
/dev/sda1 * 64 32489599 16244768 b w95 fat32
disk /dev/sdb: 12 mib, 12517376 bytes, 24448 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: 0x00000000
device boot start end blocks id system
/dev/sdb1 64 24447 12192 4 fat16 <32m
u盤就是其中的/dev/sda1 和/dev/sdb1 兩個分割槽。把打的15g的分割槽掛在上，可以通過mount /dev/sda1 /mnt/udisk來掛在到目錄下
自動掛載，可以通過兩種方式：
1.直接修改/etc/config/fstab，新增：
config 'mount'
option 'device' '/dev/sda1'
option 'options' 'rw,sync'
option 'enabled_fsck' '0'
option 'enabled' '1'
option 'target' '/mnt/udsik'
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