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Android nand partitioning??

HI:

I have a MOTO phone, I run

cat /proc/mtd

$ cat /proc/mtd

dev:    size   erasesize  name

mtd0: 00180000 00020000 "pds"

mtd1: 00060000 00020000 "cid"

mtd2: 00060000 00020000 "misc"

mtd3: 00380000 00020000 "boot"

mtd4: 00480000 00020000 "recovery"

mtd5: 008c0000 00020000 "cdrom"

mtd6: 0afa0000 00020000 "system"

mtd7: 06a00000 00020000 "cache"

mtd8: 0c520000 00020000 "userdata"

mtd9: 00180000 00020000 "cust"

mtd10: 00200000 00020000 "kpanic"

I would like to ask under these what is the usefulness of the main partition??