October 10th, 2012, 08:34 AM
Accept no imitations!
Join Date: Nov 2009
Location: Manchester, TN
Device(s): Note 3 (rooted & ROMmed), Galaxy Nexus (retired), OG Droid (retired)
Thanked 7,152 Times in 3,396 Posts
Sure Marsui... I don't have a Transform, but Android is Android.
There are various partitions in the phone's memory that are completely separate from the SD card. The main partitions are:
- Boot: this boots the phone. NEVER mess with this!
- Recovery: if you can get to recovery, you can save a bad phone. Stock recoveries are limited to what the carrier permits... custom recoveries like ClockworkMod allow the user to replace the operating system (ROM).
- Data: (big one) this is where user and app data are stored on the phone. Settings, contacts, high scores, etc. If this is cleared, you lose all your apps and data. A Data wipe is also known as factory reset.
- Cache: this is temporary memory used by user apps to run better. It can be cleared occasionally with no problem.
- System: (big one) this is where the ROM, or operating system of the phone, is. When the phone boots up, it's completely stupid until it loads the OS from System.
- Dalvik Cache: this is essentially a cache for the system, allowing it to run better. It can be cleared occasionally as well, but when you re-boot it will take longer as the phone has to repopulate it.
Glad you asked? Good!
When you flashed the ROM, it replaced the contents of the System partition. If you didn't wipe Data or the two caches at the same time, then your settings and app data will remain (as will -very likely - a lot of software conflicts and hang-ups). That's why it is VERY important, when flashing a new ROM, to do 2 things:
(1) MAKE A NANDROID BACKUP FIRST!
If something goes wrong, you want to be able to go back to the state the phone was in at the moment you made the backup. Starting all over is a real bummer, and there's no need to.
(2) Wipe Data, Cache, System and Dalvik when flashing a new ROM
. Especially if it's a different ROM. If it's an incremental update of the same ROM (let's say you're going from 2.3 to 2.4), then you might be safe by wiping just System and the caches.
Most ROM zips now include a subroutine that wipes System before loading the new ROM, but it doesn't wipe the other 3 partitions. That's on YOU.
Hope this helped explain what's going on a little bit... if you have any other questions, feel free to ask
Last edited by The_Chief; October 10th, 2012 at 08:36 AM.