bonjour
pour faire simple on peut dire qu'il y a une partition pour l'OS ( system , boot , cache , mémoire Non Volatile ) et une userdata ( applications téléchargées photos video musique contacts sms ... )
en réalité tous les tels androids possèdent au minimum une dizaine de partitions minimum
voici le partitionnement réel d'un one +3:
# eMMC devices
/dev/block/platform/soc/7464900.sdhci/by-name/fsc u

bject_r:modem_efs_partition_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/fsg u

bject_r:modem_efs_partition_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/modemst1 u

bject_r:modem_efs_partition_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/modemst2 u

bject_r:modem_efs_partition_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/ssd u

bject_r:ssd_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/misc u

bject_r:misc_partition:s0
/dev/block/platform/soc/7464900.sdhci/by-name/rpm u

bject_r:rpmb_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/system u

bject_r:system_block_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/userdata u

bject_r:userdata_block_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/msadp u

bject_r:mba_debug_dev:s0
/dev/block/platform/soc/7464900.sdhci/by-name/dip u

bject_r:dip_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/mdtp u

bject_r:mdtp_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/boot u

bject_r:boot_block_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/recovery u

bject_r:recovery_block_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/cache u

bject_r:cache_block_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/frp u

bject_r:frp_block_device:s0
/dev/block/platform/soc/7464900.sdhci/by-name/mdm1m9kefs1 u

bject_r:efs_boot_dev:s0
/dev/block/platform/soc/7464900.sdhci/by-name/mdm1m9kefs2 u

bject_r:efs_boot_dev:s0
/dev/block/platform/soc/7464900.sdhci/by-name/mdm1m9kefs3 u

bject_r:efs_boot_dev:s0
/dev/block/platform/soc/7464900.sdhci/by-name/mdm1m9kefsc u

bject_r:efs_boot_dev:s0