samsung – How many mmcblk devices is normal?

Why so many mmcblk devices?

/ dev / block / mmcblk0
/ dev / block / mmcblk0boot0
/ dev / block / mmcblk0boot1
/ dev / block / mmcblk0p1
/ dev / block / mmcblk0p10
/ dev / block / mmcblk0p11
/ dev / block / mmcblk0p12
/ dev / block / mmcblk0p13
/ dev / block / mmcblk0p14
/ dev / block / mmcblk0p15
/ dev / block / mmcblk0p16
/ dev / block / mmcblk0p17
/ dev / block / mmcblk0p18
/ dev / block / mmcblk0p19
/ dev / block / mmcblk0p2
/ dev / block / mmcblk0p20
/ dev / block / mmcblk0p21
/ dev / block / mmcblk0p3
/ dev / block / mmcblk0p4
/ dev / block / mmcblk0p5
/ dev / block / mmcblk0p6
/ dev / block / mmcblk0p7
/ dev / block / mmcblk0p8
/ dev / block / mmcblk0p9
/ dev / block / mmcblk0rpmb

What is the normal amount of mmcblk dispositives? I have problems to boot and I wonder if this type of format is normal or not.

When I boot under TWRP, and adb in. After running monte -a, I get

/ dev / block / mmcblk0p19 in / cache type ext4 (rw, seclabel, relatime, data = order)
/ dev / block / mmcblk0p21 on / data type ext4 (rw, seclabel, relatime, data = order)
/ dev / block / mmcblk0p20 in / system type ext4 (rw, seclabel, relatime)
/ dev / block / mmcblk0p16 in / preload type ext4 (rw, seclabel, relatime, data = order)

That only explains four of them though.