(I just updated my post to clarify my questions. Hope that can help to make myself clearer.)
My phone is Kyocera Hydro Icon with Android 4.3.
The website where I bought the phone says
Internal: 8GB, 1.5GB RAM
The 1.5GB RAM isn't part of the 8GB "internal", correct?
On my phone, I go to Settings -> Device -> Storage which says:
Are "internal storage" and "phone" two partitions (and thus two file systems)? If yes, what are their mounting points (directories), or how can I find out their mounting points?
Both "internal storage" and "phone" store "Apps (app data & media ...)". What are the differences between the apps stored on the two places?
Where are the firmware and OS (Android) stored in my phone, "internal storage", "phone", or somewhere else?
The total space of "internal storage" is 4.42GB, and the total space of "phone" is 1GB. But the website says I have 8GB "internal". Is it correct that there are still 8 - 4.42 - 1 = 2.58GB left? Has the remaining 2.58GB been used to store some files? If yes, what files are stored there, or how can I find it out? Is the remaining 2.58GB a partition (and thus a file system)? What is or how can I find out its mounting point?
Output of Diskinfo (under the expert setting, unmounted and other partitions checked)
The sum of the listed partitions' sizes is (800+643)MB + 4.5GB + 1GB = 1.41GB + 4.5GB + 1GB = 6.91GB, which is still smaller than 8GB "internal" given by the shopping website.
$ df Filesystem Size Used Free Blksize /dev 672.6M 128.0K 672.5M 4096 /sys/fs/cgroup 672.6M 12.0K 672.6M 4096 /mnt/asec 672.6M 0.0K 672.6M 4096 /mnt/obb 672.6M 0.0K 672.6M 4096 /system 786.5M 768.0M 18.5M 4096 /data 4.4G 3.6G 802.9M 4096 /cache 632.1M 25.7M 606.4M 4096 /persist 7.8M 4.8M 3.0M 4096 /firmware 64.0M 56.9M 7.1M 16384 /sysprop 7.8M 6.0M 1.9M 4096 /carrier 19.6M 4.0M 15.6M 4096 /mnt/media_rw/sdcard0: Permission denied /mnt/secure/asec: Permission denied /storage/sdcard0 1.9G 170.4M 1.7G 32768 /mnt/media_rw/sdcard1: Permission denied /storage/sdcard1 1023.7M 825.6M 198.1M 16384
The sum of the file systems' sizes is (672.6*4 + 786.5 + 632.1 + 7.8*2 + 64 + 19.6 + 1023.7)MB + 4.4GB = 5.11GB + 4.4GB= 9.51GB (note I convert from a MB value to a GB value by dividing MB value by 1024. I also didn't add
/storage/sdcard0into the sum , which is for the external SD card). It is greater than 8GB "internal" shown by the shopping website. Why is that?
The sizes of
dfare 786.5M, 632.1M and 4.4G, while the sizes of
Data (userdata)given by
Diskinfoare 800MB, 643MB and 4.5GB. why do they not match? (The size of
dfand the size of
SD card (internalstorage)given by