首先手机需要root，并且打开usb调试模式，连接电脑。
电脑端使用adb命令查看手机分区信息：
adb shell
root@m7:/ # su
root@m7:/ # cat /proc/emmc
dev: size erasesize name
mmcblk0p19: 000ffa00 00000200 "misc"
mmcblk0p34: 00fffe00 00000200 "recovery"
mmcblk0p33: 01000000 00000200 "boot"
mmcblk0p35: 73fffc00 00000200 "system"
mmcblk0p26: 00140200 00000200 "local"
mmcblk0p36: 27fffe00 00000200 "cache"
mmcblk0p37: 680000000 00000200 "userdata"
mmcblk0p22: 01400000 00000200 "devlog"
mmcblk0p24: 00040000 00000200 "pdata"
mmcblk0p27: 00010000 00000200 "extra"
mmcblk0p31: 04b00200 00000200 "radio"
mmcblk0p16: 03c00400 00000200 "adsp"
mmcblk0p15: 00100000 00000200 "dsps"
mmcblk0p17: 007ffa00 00000200 "radio_config"
mmcblk0p20: 00400000 00000200 "modem_st1"
mmcblk0p21: 00400000 00000200 "modem_st2"
mmcblk0p38: 01900000 00000200 "carrier"
mmcblk0p28: 00100000 00000200 "cdma_record"
mmcblk0p18: 02000000 00000200 "reserve_1"
mmcblk0p30: 034ffa00 00000200 "reserve_2"
mmcblk0p32: 05fffc00 00000200 "reserve_3"
mmcblk0p29: 06069e00 00000200 "reserve"
mmcblk0p25: 00004000 00000200 "control"