Wipe Data, Cache, Dalvik Cache and format /System
is necessary ""after""
or before ???
or both times when WE port the new rom ? ?
or why we do it if we not do it what happened?
When you decide to install a new ROM, then you have to do those wipes,
Cache and Dalvik Cache are related to every APK in the ROM, when you start boot the ROM for the first time, Dalvik cache indexes all APKs and cache it's dex files into the Cache partition, that happens only once, and you can actually see this when Android tells you it's "Optimizing Apps x of x",
So, what happens if installed a new ROM without wiping Cache and Dalvik Cache?,
Dalvik cache won't index the new APKs from the new ROM, and you'll end up having a ROM full of FC msgs,
So, that's why you need to wipe Cache and Dalvik Cache when you install a new ROM, before the ROM or after that won't matter, but don't boot up a new ROM without wiping those partitions.
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Related
Hey guys just a quick question about installing nightly builds on the nook. When Rom Manager asks whether to wipe data/cache and what not, if I select it, will it wipe the internal memory completely? leaving no user files behind? or will it only wipe the system files?
It will wipe everything and it will be a fresh install.
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If you update, just wipe cache
It wipes the /data partition but doesn't wipe /sdcard /sd-ext or /met/emmc.
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EGM92 said:
Hey guys just a quick question about installing nightly builds on the nook. When Rom Manager asks whether to wipe data/cache and what not, if I select it, will it wipe the internal memory completely? leaving no user files behind? or will it only wipe the system files?
Click to expand...
Click to collapse
Just wipe Davlik.
if boot is longer than normal after wipe, it's normal!
votinh said:
If you update, just wipe cache
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Click to collapse
patruns said:
Just wipe Davlik.
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Click to collapse
So... just wipe Davlik Cache is what you guys are saying?
Good question helped out a newb here
Jiv_au said:
So... just wipe Davlik Cache is what you guys are saying?
Click to expand...
Click to collapse
Correct
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Jiv_au said:
So... just wipe Davlik Cache is what you guys are saying?
Click to expand...
Click to collapse
Note: wipe cache and wipe Dalvik cache are 2 different things.
+ wipe cache is a quick way to clean the current running ROM
+ wipe Dalvik is a completely clean.
After wipe Dalvik, next time it boots, it will take a lot longer time due to the device has to re-compile the whole thing before ROM start running and booting.
I think I need to drop a few lines about wipe cache/Dalvik.
As I posted above, I said it wiped clean.
Apparently, I am NOT 100% correct.
I just updated to nb198, wiped cache (formatting /cache) then wipe Dalvik cache.
After done updating ROM, booting up, I expected everything clean, completely fresh.
It's not the case, I went to Market and all old search history were still shown. Not only with Market but other apps too.
So
a. either wipe cache/Dalvik is NOT completely clean wipe or
b. it was completely clean but somehow, those old cache info, which stored somewhere I don't know, get automatically restored back.
Okay, I did a quick read of the FAQ for CWR, and came across these:
Wipe cache partition
Wipes the cache partition of the device to clear all the data accumulated there over use. This is often used before installing a new ROM, app, kernel or any similar mod via recovery.
Wipe Dalvik Cache
Allows you to wipe the cache for the Dalvik virtual machine (the custom-built Java virtual machine for Android).This is required before most ROM installations and at other occasions too, for fixing some problems.
So, I'm taking this guide on board and will wiping Cache AND Davlik. So that's two steps prior to installing a new CM7 nightly build.
votinh said:
I think I need to drop a few lines about wipe cache/Dalvik. *snip*
a. either wipe cache/Dalvik is NOT completely clean wipe or
b. it was completely clean but somehow, those old cache info, which stored somewhere I don't know, get automatically restored back.
Click to expand...
Click to collapse
You didn't happen to store them in uSD card? Or perhaps app data/cache are separate from system data/cache...
Will look into it further...
I changed system partition size on my gt540 to 220mb to use ICS. But when I restore my backed-up ROM(CM7) it sticks on boot logo or restarts over and over.. changed my system partition back to 150mb still same problem and ICS still work . (system partition didn't change)so I cant change my partition anymore?!
Did you wipe cach and dalvik cach after restore?
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cache wiped but what is dalvik cache and how to wipe it?
justsayin' said:
cache wiped but what is dalvik cache and how to wipe it?
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Click to collapse
Recovery , advanced , wipe dalvik cache
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gonna give it a try
EDIT: worked thank you very much
Hi,
I've recently done a succesful flash of Blisspop after a full wipe.
Now I want to update, but I don't want to do a full wipe. Simply installing the zip on-top gives a permanent booting screen. Can you update without starting from scratch?
Did you wipe cache & dalvik after flashing updated zip?
I did not. Is that the only required extra step? And will I lose data if I do so?
Kalenden said:
I did not. Is that the only required extra step? And will I lose data if I do so?
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Click to collapse
No, you only lose data when you wipe the data partition
In recovery, you'll see different named partitions, cache, dalvik cache, system, data, etc etc
If you wipe System, you wipe the ROM
If you wipe Data, you wipe your user data
Caches are just temp partitions, safe to wipe any time, only side effect is a longer first boot as Android needs to re-cache everything
But yes, you do need to wipe the caches when updating to a newer version of the same ROM/Droid version, and no you won't lose your data
Here's how I do it:
Wipe System
Wipe Caches
Flash new ROM
Flash new Gapps
Flash SuperSU if needed
Wipe Caches again
Reboot
Result = New ROM with no loss of data
That's a clean flash, a dirty flash is how you did it without wiping System
If you are moving to a newer version of android, or a different ROM, wiping data becomes more necessary, especially if the move is to an older version of droid
Thanks. I'll try it out.
So, if I wipe cache in TWRP, the app cache as reported by the system remains. Just tonight I was able to wipe over 2GB of app cache within the system, something I thought I would have rid myself with the wipe cache function within recovery.
floepie said:
So, if I wipe cache in TWRP, the app cache as reported by the system remains. Just tonight I was able to wipe over 2GB of app cache within the system, something I thought I would have rid myself with the wipe cache function within recovery.
Click to expand...
Click to collapse
That is because you're wiping the device's /cache partition, while app-specific cache is stored on the /data partition. So, It needs manual cleaning from within the app settings.
I see dalvik / art cache and system, data
which one do I chose to clear system cache, without bricking my system?
You have only one option - dalvik.
Cache is old days from, it doesn't exist anymore on pies. If you try to wipe you'll get an error in TWRP.
System and data are speaking for themselves. Wipe system - brick phone, wipe data - loss of apps and personal stuff